diff --git a/cmake/modules/FindTBB.cmake.in b/cmake/modules/FindTBB.cmake.in
index a7eafa545..49e405c18 100644
--- a/cmake/modules/FindTBB.cmake.in
+++ b/cmake/modules/FindTBB.cmake.in
@@ -293,7 +293,7 @@ if(NOT TBB_FOUND)
   # Create targets
   ##################################
 
-  if(NOT CMAKE_VERSION VERSION_LESS 3.0 AND TBB_FOUND)
+  if(NOT CMAKE_VERSION VERSION_LESS 3.0 AND TBB_FOUND AND NOT TARGET TBB::tbb)
     add_library(TBB::tbb UNKNOWN IMPORTED)
     set_target_properties(TBB::tbb PROPERTIES
           INTERFACE_COMPILE_DEFINITIONS "${TBB_DEFINITIONS}"
diff --git a/resources/icons/legend_cog.svg b/resources/icons/legend_cog.svg
new file mode 100644
index 000000000..9a55fb7f5
--- /dev/null
+++ b/resources/icons/legend_cog.svg
@@ -0,0 +1,50 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Svg Vector Icons : http://www.onlinewebfonts.com/icon -->
+
+<svg
+   version="1.1"
+   x="0px"
+   y="0px"
+   viewBox="0 0 1000 1000"
+   enable-background="new 0 0 1000 1000"
+   xml:space="preserve"
+   id="svg1405"
+   sodipodi:docname="legend_cog.svg"
+   inkscape:version="1.1 (c68e22c387, 2021-05-23)"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg"><defs
+   id="defs1409" /><sodipodi:namedview
+   id="namedview1407"
+   pagecolor="#505050"
+   bordercolor="#eeeeee"
+   borderopacity="1"
+   inkscape:pageshadow="0"
+   inkscape:pageopacity="0"
+   inkscape:pagecheckerboard="0"
+   showgrid="false"
+   inkscape:zoom="0.57417071"
+   inkscape:cx="498.98052"
+   inkscape:cy="500.72217"
+   inkscape:window-width="1920"
+   inkscape:window-height="1001"
+   inkscape:window-x="-9"
+   inkscape:window-y="-9"
+   inkscape:window-maximized="1"
+   inkscape:current-layer="g1403" />
+<metadata
+   id="metadata1400"> Svg Vector Icons : http://www.onlinewebfonts.com/icon </metadata>
+<g
+   id="g1403"><g
+     id="g3385"
+     transform="matrix(0.9,0,0,0.9,50,50)"><path
+       id="Delicious"
+       d="M 951.5,309.2 C 914.3,221.2 852.2,146.5 774,93.7 734.9,67.3 691.8,46.3 645.7,32 599.6,17.7 550.7,10 500,10 432.4,10 367.9,23.7 309.3,48.5 221.3,85.7 146.5,147.8 93.7,226 67.3,265.1 46.3,308.2 32,354.3 c -14.3,46 -22,95 -22,145.7 0,67.6 13.7,132.1 38.5,190.8 37.2,88 99.3,162.7 177.5,215.5 39.1,26.4 82.2,47.3 128.3,61.7 46,14.4 95,22 145.7,22 67.5,0 132.1,-13.7 190.7,-38.5 88,-37.2 162.7,-99.3 215.6,-177.5 26.4,-39.1 47.3,-82.3 61.7,-128.3 14.3,-46 22,-95 22,-145.7 0,-67.6 -13.7,-132.1 -38.5,-190.8 z m -61,355.7 c -32.2,76 -85.9,140.8 -153.6,186.4 -33.8,22.9 -71.1,41 -110.9,53.3 -39.8,12.3 -82.1,19 -126,19.1 v 0 -423.2 H 76.3 c 0,-0.2 0,-0.3 0,-0.5 0,-58.6 11.8,-114.2 33.3,-164.9 32.1,-76 85.9,-140.8 153.6,-186.5 33.8,-22.8 71.1,-40.9 110.9,-53.3 39.8,-12.4 82.1,-19 126,-19 V 500 h 423.7 c -0.1,58.6 -11.9,114.2 -33.3,164.9 z" /></g><path
+     style="fill:#ffffff;stroke-width:7.38916;stroke-miterlimit:10;fill-opacity:1"
+     d="m 77.139043,487.37685 c 3.697394,-84.56835 26.698247,-155.86557 72.010107,-223.21429 16.59166,-24.6608 30.37464,-41.20638 53.34679,-64.03941 27.30359,-27.13822 52.65045,-46.7668 84.88257,-65.73293 55.05852,-32.39773 124.18158,-53.51654 183.99427,-56.214822 7.95557,-0.358893 17.65123,-0.906877 21.54594,-1.217743 L 500,76.392444 V 288.19622 500 H 288.29357 76.58715 Z"
+     id="path1516" /><path
+     style="fill:#ffffff;fill-opacity:1;stroke-width:7.38916;stroke-miterlimit:10"
+     d="M 500,711.76464 V 500 h 211.90502 211.90504 l -0.7671,13.23892 c -1.37279,23.69173 -3.21854,41.23939 -6.18546,58.80541 -24.78089,146.71813 -128.58118,271.82029 -269.07425,324.29358 -38.30204,14.30558 -84.14865,23.99629 -120.68965,25.51049 -8.46675,0.35085 -18.02648,0.87257 -21.24385,1.1594 L 500,923.52927 Z"
+     id="path3257" /></g>
+</svg>
diff --git a/resources/shaders/printbed.fs b/resources/shaders/printbed.fs
index d1316ca2f..bef075158 100644
--- a/resources/shaders/printbed.fs
+++ b/resources/shaders/printbed.fs
@@ -1,6 +1,6 @@
 #version 110
 
-const vec3 back_color_dark = vec3(0.235, 0.235, 0.235);
+const vec3 back_color_dark  = vec3(0.235, 0.235, 0.235);
 const vec3 back_color_light = vec3(0.365, 0.365, 0.365);
 
 uniform sampler2D texture;
diff --git a/resources/shaders/printbed.vs b/resources/shaders/printbed.vs
index 7633017f1..3b3f8875d 100644
--- a/resources/shaders/printbed.vs
+++ b/resources/shaders/printbed.vs
@@ -1,14 +1,9 @@
 #version 110
 
-attribute vec3 v_position;
-attribute vec2 v_tex_coords;
-
 varying vec2 tex_coords;
 
 void main()
 {
-    gl_Position = gl_ModelViewProjectionMatrix * vec4(v_position.x, v_position.y, v_position.z, 1.0);
-	// the following line leads to crash on some Intel graphics card
-    //gl_Position = gl_ModelViewProjectionMatrix * vec4(v_position, 1.0);
-    tex_coords = v_tex_coords;
+    gl_Position = ftransform();
+	tex_coords = gl_MultiTexCoord0.xy;
 }
diff --git a/resources/shaders/toolpaths_cog.fs b/resources/shaders/toolpaths_cog.fs
new file mode 100644
index 000000000..f88d79b96
--- /dev/null
+++ b/resources/shaders/toolpaths_cog.fs
@@ -0,0 +1,18 @@
+#version 110
+
+const vec4 BLACK = vec4(vec3(0.1), 1.0);
+const vec4 WHITE = vec4(vec3(1.0), 1.0);
+
+const float emission_factor = 0.25;
+
+// x = tainted, y = specular;
+varying vec2 intensity;
+varying vec3 world_position;
+uniform vec3 world_center;
+
+void main()
+{
+    vec3 delta = world_position - world_center;
+    vec4 color = delta.x * delta.y * delta.z > 0.0 ? BLACK : WHITE;
+    gl_FragColor = vec4(vec3(intensity.y) + color.rgb * (intensity.x + emission_factor), 1.0);
+}
diff --git a/resources/shaders/toolpaths_cog.vs b/resources/shaders/toolpaths_cog.vs
new file mode 100644
index 000000000..c7b1abfdb
--- /dev/null
+++ b/resources/shaders/toolpaths_cog.vs
@@ -0,0 +1,40 @@
+#version 110
+
+#define INTENSITY_CORRECTION 0.6
+
+// normalized values for (-0.6/1.31, 0.6/1.31, 1./1.31)
+const vec3 LIGHT_TOP_DIR = vec3(-0.4574957, 0.4574957, 0.7624929);
+#define LIGHT_TOP_DIFFUSE    (0.8 * INTENSITY_CORRECTION)
+#define LIGHT_TOP_SPECULAR   (0.125 * INTENSITY_CORRECTION)
+#define LIGHT_TOP_SHININESS  20.0
+
+// normalized values for (1./1.43, 0.2/1.43, 1./1.43)
+const vec3 LIGHT_FRONT_DIR = vec3(0.6985074, 0.1397015, 0.6985074);
+#define LIGHT_FRONT_DIFFUSE  (0.3 * INTENSITY_CORRECTION)
+
+#define INTENSITY_AMBIENT    0.3
+
+// x = tainted, y = specular;
+varying vec2 intensity;
+varying vec3 world_position;
+
+void main()
+{
+    // First transform the normal into camera space and normalize the result.
+    vec3 normal = normalize(gl_NormalMatrix * gl_Normal);
+    
+    // Compute the cos of the angle between the normal and lights direction. The light is directional so the direction is constant for every vertex.
+    // Since these two are normalized the cosine is the dot product. We also need to clamp the result to the [0,1] range.
+    float NdotL = max(dot(normal, LIGHT_TOP_DIR), 0.0);
+
+    intensity.x = INTENSITY_AMBIENT + NdotL * LIGHT_TOP_DIFFUSE;
+    vec3 position = (gl_ModelViewMatrix * gl_Vertex).xyz;
+    intensity.y = LIGHT_TOP_SPECULAR * pow(max(dot(-normalize(position), reflect(-LIGHT_TOP_DIR, normal)), 0.0), LIGHT_TOP_SHININESS);
+
+    // Perform the same lighting calculation for the 2nd light source (no specular applied).
+    NdotL = max(dot(normal, LIGHT_FRONT_DIR), 0.0);
+    intensity.x += NdotL * LIGHT_FRONT_DIFFUSE;
+
+	world_position = gl_Vertex.xyz;
+    gl_Position = ftransform();
+}
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 9e89e82f6..ab1c7b964 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -14,6 +14,7 @@ add_subdirectory(Shiny)
 add_subdirectory(semver)
 add_subdirectory(libigl)
 add_subdirectory(hints)
+add_subdirectory(qoi)
 
 # Adding libnest2d project for bin packing...
 add_subdirectory(libnest2d)
diff --git a/src/PrusaSlicer.cpp b/src/PrusaSlicer.cpp
index 2648fba9e..4483d6010 100644
--- a/src/PrusaSlicer.cpp
+++ b/src/PrusaSlicer.cpp
@@ -498,8 +498,6 @@ int CLI::run(int argc, char **argv)
                 std::string outfile = m_config.opt_string("output");
                 Print       fff_print;
                 SLAPrint    sla_print;
-                SL1Archive  sla_archive(sla_print.printer_config());
-                sla_print.set_printer(&sla_archive);
                 sla_print.set_status_callback(
                             [](const PrintBase::SlicingStatus& s)
                 {
@@ -539,7 +537,7 @@ int CLI::run(int argc, char **argv)
                             outfile = sla_print.output_filepath(outfile);
                             // We need to finalize the filename beforehand because the export function sets the filename inside the zip metadata
                             outfile_final = sla_print.print_statistics().finalize_output_path(outfile);
-                            sla_archive.export_print(outfile_final, sla_print);
+                            sla_print.export_print(outfile_final);
                         }
                         if (outfile != outfile_final) {
                             if (Slic3r::rename_file(outfile, outfile_final)) {
@@ -838,6 +836,7 @@ extern "C" {
                "leak:libnvidia-glcore.so\n"     // For NVidia driver.
                "leak:libnvidia-tls.so\n"        // For NVidia driver.
                "leak:terminator_CreateDevice\n" // For Intel Vulkan drivers.
+               "leak:swrast_dri.so\n"           // For Mesa 3D software driver.
             ;
     }
 }
diff --git a/src/imgui/imconfig.h b/src/imgui/imconfig.h
index db0e54e60..f2c3ef083 100644
--- a/src/imgui/imconfig.h
+++ b/src/imgui/imconfig.h
@@ -165,8 +165,9 @@ namespace ImGui
     const wchar_t LegendColorChanges       = 0x2612;
     const wchar_t LegendPausePrints        = 0x2613;
     const wchar_t LegendCustomGCodes       = 0x2614;
-    const wchar_t LegendShells             = 0x2615;
-    const wchar_t LegendToolMarker         = 0x2616;
+    const wchar_t LegendCOG                = 0x2615;
+    const wchar_t LegendShells             = 0x2616;
+    const wchar_t LegendToolMarker         = 0x2617;
 
 //    void MyFunction(const char* name, const MyMatrix44& v);
 }
diff --git a/src/libslic3r/CMakeLists.txt b/src/libslic3r/CMakeLists.txt
index cb66a4adb..7809b3044 100644
--- a/src/libslic3r/CMakeLists.txt
+++ b/src/libslic3r/CMakeLists.txt
@@ -98,8 +98,12 @@ set(SLIC3R_SOURCES
     Format/STL.hpp
     Format/SL1.hpp
     Format/SL1.cpp
+    Format/SL1_SVG.hpp
+    Format/SL1_SVG.cpp
     GCode/ThumbnailData.cpp
     GCode/ThumbnailData.hpp
+    GCode/Thumbnails.cpp
+    GCode/Thumbnails.hpp
     GCode/CoolingBuffer.cpp
     GCode/CoolingBuffer.hpp
     GCode/FindReplace.cpp
@@ -352,6 +356,9 @@ encoding_check(libslic3r)
 target_compile_definitions(libslic3r PUBLIC -DUSE_TBB -DTBB_USE_CAPTURED_EXCEPTION=0)
 target_include_directories(libslic3r PRIVATE ${CMAKE_CURRENT_SOURCE_DIR} PUBLIC ${CMAKE_CURRENT_BINARY_DIR})
 target_include_directories(libslic3r PUBLIC ${EXPAT_INCLUDE_DIRS})
+
+find_package(JPEG REQUIRED)
+
 target_link_libraries(libslic3r
     libnest2d
     admesh
@@ -370,6 +377,8 @@ target_link_libraries(libslic3r
     ${CMAKE_DL_LIBS}
     PNG::PNG
     ZLIB::ZLIB
+	JPEG::JPEG
+    qoi
     )
 
 if (TARGET OpenVDB::openvdb)
diff --git a/src/libslic3r/Extruder.cpp b/src/libslic3r/Extruder.cpp
index f7a5c5007..d2ff65097 100644
--- a/src/libslic3r/Extruder.cpp
+++ b/src/libslic3r/Extruder.cpp
@@ -1,4 +1,5 @@
 #include "Extruder.hpp"
+#include "GCodeWriter.hpp"
 #include "PrintConfig.hpp"
 
 namespace Slic3r {
@@ -7,24 +8,24 @@ Extruder::Extruder(unsigned int id, GCodeConfig *config) :
     m_id(id),
     m_config(config)
 {
-    reset();
-    
     // cache values that are going to be called often
     m_e_per_mm3 = this->extrusion_multiplier();
     if (! m_config->use_volumetric_e)
         m_e_per_mm3 /= this->filament_crossection();
 }
 
-double Extruder::extrude(double dE)
+std::pair<double, double> Extruder::extrude(double dE)
 {
     // in case of relative E distances we always reset to 0 before any output
     if (m_config->use_relative_e_distances)
         m_E = 0.;
+    // Quantize extruder delta to G-code resolution.
+    dE = GCodeFormatter::quantize_e(dE);
     m_E          += dE;
     m_absolute_E += dE;
     if (dE < 0.)
         m_retracted -= dE;
-    return dE;
+    return std::make_pair(dE, m_E);
 }
 
 /* This method makes sure the extruder is retracted by the specified amount
@@ -34,28 +35,33 @@ double Extruder::extrude(double dE)
    The restart_extra argument sets the extra length to be used for
    unretraction. If we're actually performing a retraction, any restart_extra
    value supplied will overwrite the previous one if any. */
-double Extruder::retract(double length, double restart_extra)
+std::pair<double, double> Extruder::retract(double retract_length, double restart_extra)
 {
     // in case of relative E distances we always reset to 0 before any output
     if (m_config->use_relative_e_distances)
         m_E = 0.;
-    double to_retract = std::max(0., length - m_retracted);
+    // Quantize extruder delta to G-code resolution.
+    double to_retract = this->retract_to_go(retract_length);
     if (to_retract > 0.) {
         m_E             -= to_retract;
         m_absolute_E    -= to_retract;
         m_retracted     += to_retract;
-        m_restart_extra = restart_extra;
+        m_restart_extra  = restart_extra;
     }
-    return to_retract;
+    return std::make_pair(to_retract, m_E);
 }
 
-double Extruder::unretract()
+double Extruder::retract_to_go(double retract_length) const
 {
-    double dE = m_retracted + m_restart_extra;
-    this->extrude(dE);
+    return std::max(0., GCodeFormatter::quantize_e(retract_length - m_retracted));
+}
+
+std::pair<double, double> Extruder::unretract()
+{
+    auto [dE, emitE] = this->extrude(m_retracted + m_restart_extra);
     m_retracted     = 0.;
     m_restart_extra = 0.;
-    return dE;
+    return std::make_pair(dE, emitE);
 }
 
 // Used filament volume in mm^3.
diff --git a/src/libslic3r/Extruder.hpp b/src/libslic3r/Extruder.hpp
index e9c6927f8..7491b1c8f 100644
--- a/src/libslic3r/Extruder.hpp
+++ b/src/libslic3r/Extruder.hpp
@@ -12,22 +12,24 @@ class Extruder
 {
 public:
     Extruder(unsigned int id, GCodeConfig *config);
-    virtual ~Extruder() {}
-
-    void   reset() {
-        m_E             = 0;
-        m_absolute_E    = 0;
-        m_retracted     = 0;
-        m_restart_extra = 0;
-    }
+    ~Extruder() = default;
 
     unsigned int id() const { return m_id; }
 
-    double extrude(double dE);
-    double retract(double length, double restart_extra);
-    double unretract();
-    double E() const { return m_E; }
-    void   reset_E() { m_E = 0.; }
+    // Following three methods emit:
+    // first  - extrusion delta
+    // second - number to emit to G-code: This may be delta for relative mode or a distance from last reset_E() for absolute mode.
+    // They also quantize the E axis to G-code resolution.
+    std::pair<double, double> extrude(double dE);
+    std::pair<double, double> retract(double retract_length, double restart_extra);
+    std::pair<double, double> unretract();
+    // How much to retract yet before retract_length is reached?
+    // The value is quantized to G-code resolution.
+    double                    retract_to_go(double retract_length) const;
+
+    // Reset the current state of the E axis (this is only needed for relative extruder addressing mode anyways).
+    // Returns true if the extruder was non-zero before reset.
+    bool   reset_E() { bool modified = m_E != 0; m_E = 0.; return modified; }
     double e_per_mm(double mm3_per_mm) const { return mm3_per_mm * m_e_per_mm3; }
     double e_per_mm3() const { return m_e_per_mm3; }
     // Used filament volume in mm^3.
@@ -57,14 +59,16 @@ private:
     GCodeConfig *m_config;
     // Print-wide global ID of this extruder.
     unsigned int m_id;
-    // Current state of the extruder axis, may be resetted if use_relative_e_distances.
-    double       m_E;
+    // Current state of the extruder axis.
+    // For absolute extruder addressing, it is the current state since the last reset (G92 E0) issued at the end of the last retraction.
+    // For relative extruder addressing, it is the E axis difference emitted into the G-code the last time.
+    double       m_E { 0 };
     // Current state of the extruder tachometer, used to output the extruded_volume() and used_filament() statistics.
-    double       m_absolute_E;
+    double       m_absolute_E { 0 };
     // Current positive amount of retraction.
-    double       m_retracted;
+    double       m_retracted { 0 };
     // When retracted, this value stores the extra amount of priming on deretraction.
-    double       m_restart_extra;
+    double       m_restart_extra { 0 };
     double       m_e_per_mm3;
 };
 
@@ -76,4 +80,4 @@ inline bool operator> (const Extruder &e1, const Extruder &e2) { return e1.id()
 
 }
 
-#endif
+#endif // slic3r_Extruder_hpp_
diff --git a/src/libslic3r/Format/3mf.cpp b/src/libslic3r/Format/3mf.cpp
index df6925a42..3359983a5 100644
--- a/src/libslic3r/Format/3mf.cpp
+++ b/src/libslic3r/Format/3mf.cpp
@@ -125,18 +125,21 @@ static constexpr const char* LAST_TRIANGLE_ID_ATTR = "lastid";
 static constexpr const char* OBJECT_TYPE = "object";
 static constexpr const char* VOLUME_TYPE = "volume";
 
-static constexpr const char* NAME_KEY = "name";
-static constexpr const char* MODIFIER_KEY = "modifier";
+static constexpr const char* NAME_KEY        = "name";
+static constexpr const char* MODIFIER_KEY    = "modifier";
 static constexpr const char* VOLUME_TYPE_KEY = "volume_type";
-static constexpr const char* MATRIX_KEY = "matrix";
-static constexpr const char* SOURCE_FILE_KEY = "source_file";
-static constexpr const char* SOURCE_OBJECT_ID_KEY = "source_object_id";
-static constexpr const char* SOURCE_VOLUME_ID_KEY = "source_volume_id";
-static constexpr const char* SOURCE_OFFSET_X_KEY = "source_offset_x";
-static constexpr const char* SOURCE_OFFSET_Y_KEY = "source_offset_y";
-static constexpr const char* SOURCE_OFFSET_Z_KEY = "source_offset_z";
-static constexpr const char* SOURCE_IN_INCHES    = "source_in_inches";
-static constexpr const char* SOURCE_IN_METERS    = "source_in_meters";
+static constexpr const char* MATRIX_KEY      = "matrix";
+static constexpr const char* SOURCE_FILE_KEY              = "source_file";
+static constexpr const char* SOURCE_OBJECT_ID_KEY         = "source_object_id";
+static constexpr const char* SOURCE_VOLUME_ID_KEY         = "source_volume_id";
+static constexpr const char* SOURCE_OFFSET_X_KEY          = "source_offset_x";
+static constexpr const char* SOURCE_OFFSET_Y_KEY          = "source_offset_y";
+static constexpr const char* SOURCE_OFFSET_Z_KEY          = "source_offset_z";
+static constexpr const char* SOURCE_IN_INCHES_KEY         = "source_in_inches";
+static constexpr const char* SOURCE_IN_METERS_KEY         = "source_in_meters";
+#if ENABLE_RELOAD_FROM_DISK_REWORK
+static constexpr const char* SOURCE_IS_BUILTIN_VOLUME_KEY = "source_is_builtin_volume";
+#endif // ENABLE_RELOAD_FROM_DISK_REWORK
 
 static constexpr const char* MESH_STAT_EDGES_FIXED          = "edges_fixed";
 static constexpr const char* MESH_STAT_DEGENERATED_FACETS   = "degenerate_facets";
@@ -843,6 +846,20 @@ namespace Slic3r {
                 return false;
         }
 
+#if ENABLE_RELOAD_FROM_DISK_REWORK
+        for (int obj_id = 0; obj_id < int(model.objects.size()); ++obj_id) {
+            ModelObject* o = model.objects[obj_id];
+            for (int vol_id = 0; vol_id < int(o->volumes.size()); ++vol_id) {
+                ModelVolume* v = o->volumes[vol_id];
+                if (v->source.input_file.empty())
+                    v->source.input_file = v->name.empty() ? filename : v->name;
+                if (v->source.volume_idx == -1)
+                    v->source.volume_idx = vol_id;
+                if (v->source.object_idx == -1)
+                    v->source.object_idx = obj_id;
+            }
+        }
+#else
         int object_idx = 0;
         for (ModelObject* o : model.objects) {
             int volume_idx = 0;
@@ -858,6 +875,7 @@ namespace Slic3r {
             }
             ++object_idx;
         }
+#endif // ENABLE_RELOAD_FROM_DISK_REWORK
 
 //        // fixes the min z of the model if negative
 //        model.adjust_min_z();
@@ -2120,15 +2138,19 @@ namespace Slic3r {
                 else if (metadata.key == SOURCE_VOLUME_ID_KEY)
                     volume->source.volume_idx = ::atoi(metadata.value.c_str());
                 else if (metadata.key == SOURCE_OFFSET_X_KEY)
-                    volume->source.mesh_offset(0) = ::atof(metadata.value.c_str());
+                    volume->source.mesh_offset.x() = ::atof(metadata.value.c_str());
                 else if (metadata.key == SOURCE_OFFSET_Y_KEY)
-                    volume->source.mesh_offset(1) = ::atof(metadata.value.c_str());
+                    volume->source.mesh_offset.y() = ::atof(metadata.value.c_str());
                 else if (metadata.key == SOURCE_OFFSET_Z_KEY)
-                    volume->source.mesh_offset(2) = ::atof(metadata.value.c_str());
-                else if (metadata.key == SOURCE_IN_INCHES)
+                    volume->source.mesh_offset.z() = ::atof(metadata.value.c_str());
+                else if (metadata.key == SOURCE_IN_INCHES_KEY)
                     volume->source.is_converted_from_inches = metadata.value == "1";
-                else if (metadata.key == SOURCE_IN_METERS)
+                else if (metadata.key == SOURCE_IN_METERS_KEY)
                     volume->source.is_converted_from_meters = metadata.value == "1";
+#if ENABLE_RELOAD_FROM_DISK_REWORK
+                else if (metadata.key == SOURCE_IS_BUILTIN_VOLUME_KEY)
+                    volume->source.is_from_builtin_objects = metadata.value == "1";
+#endif // ENABLE_RELOAD_FROM_DISK_REWORK
                 else
                     volume->config.set_deserialize(metadata.key, metadata.value, config_substitutions);
             }
@@ -3063,36 +3085,40 @@ namespace Slic3r {
                     // stores volume's type (overrides the modifier field above)
                     add_metadata(stream, 3, MetadataType::volume, VOLUME_TYPE_KEY, ModelVolume::type_to_string(volume->type()));
 
-                    // stores volume's local matrix
-                    stream << "   <" << METADATA_TAG << " " << TYPE_ATTR << "=\"" << VOLUME_TYPE << "\" " << KEY_ATTR << "=\"" << MATRIX_KEY << "\" " << VALUE_ATTR << "=\"";
-                    Transform3d matrix = volume->get_matrix() * volume->source.transform.get_matrix();
-                    for (int r = 0; r < 4; ++r) {
-                        for (int c = 0; c < 4; ++c) {
-                            stream << matrix(r, c);
-                            if (r != 3 || c != 3)
-                                stream << " ";
-                        }
-                    }
-                    stream << "\"/>\n";
+                            // stores volume's local matrix
+                            stream << "   <" << METADATA_TAG << " " << TYPE_ATTR << "=\"" << VOLUME_TYPE << "\" " << KEY_ATTR << "=\"" << MATRIX_KEY << "\" " << VALUE_ATTR << "=\"";
+                            const Transform3d matrix = volume->get_matrix() * volume->source.transform.get_matrix();
+                            for (int r = 0; r < 4; ++r) {
+                                for (int c = 0; c < 4; ++c) {
+                                    stream << matrix(r, c);
+                                    if (r != 3 || c != 3)
+                                        stream << " ";
+                                }
+                            }
+                            stream << "\"/>\n";
 
-                    // stores volume's source data
-                    {
-                        std::string input_file = xml_escape(m_fullpath_sources ? volume->source.input_file : boost::filesystem::path(volume->source.input_file).filename().string());
-                        std::string prefix = std::string("   <") + METADATA_TAG + " " + TYPE_ATTR + "=\"" + VOLUME_TYPE + "\" " + KEY_ATTR + "=\"";
-                        if (! volume->source.input_file.empty()) {
-                            stream << prefix << SOURCE_FILE_KEY      << "\" " << VALUE_ATTR << "=\"" << input_file << "\"/>\n";
-                            stream << prefix << SOURCE_OBJECT_ID_KEY << "\" " << VALUE_ATTR << "=\"" << volume->source.object_idx << "\"/>\n";
-                            stream << prefix << SOURCE_VOLUME_ID_KEY << "\" " << VALUE_ATTR << "=\"" << volume->source.volume_idx << "\"/>\n";
-                            stream << prefix << SOURCE_OFFSET_X_KEY  << "\" " << VALUE_ATTR << "=\"" << volume->source.mesh_offset(0) << "\"/>\n";
-                            stream << prefix << SOURCE_OFFSET_Y_KEY  << "\" " << VALUE_ATTR << "=\"" << volume->source.mesh_offset(1) << "\"/>\n";
-                            stream << prefix << SOURCE_OFFSET_Z_KEY  << "\" " << VALUE_ATTR << "=\"" << volume->source.mesh_offset(2) << "\"/>\n";
-                        }
-                        assert(! volume->source.is_converted_from_inches || ! volume->source.is_converted_from_meters);
-                        if (volume->source.is_converted_from_inches)
-                            stream << prefix << SOURCE_IN_INCHES << "\" " << VALUE_ATTR << "=\"1\"/>\n";
-                        else if (volume->source.is_converted_from_meters)
-                            stream << prefix << SOURCE_IN_METERS << "\" " << VALUE_ATTR << "=\"1\"/>\n";
-                    }
+                            // stores volume's source data
+                            {
+                                std::string input_file = xml_escape(m_fullpath_sources ? volume->source.input_file : boost::filesystem::path(volume->source.input_file).filename().string());
+                                std::string prefix = std::string("   <") + METADATA_TAG + " " + TYPE_ATTR + "=\"" + VOLUME_TYPE + "\" " + KEY_ATTR + "=\"";
+                                if (! volume->source.input_file.empty()) {
+                                    stream << prefix << SOURCE_FILE_KEY      << "\" " << VALUE_ATTR << "=\"" << input_file << "\"/>\n";
+                                    stream << prefix << SOURCE_OBJECT_ID_KEY << "\" " << VALUE_ATTR << "=\"" << volume->source.object_idx << "\"/>\n";
+                                    stream << prefix << SOURCE_VOLUME_ID_KEY << "\" " << VALUE_ATTR << "=\"" << volume->source.volume_idx << "\"/>\n";
+                                    stream << prefix << SOURCE_OFFSET_X_KEY  << "\" " << VALUE_ATTR << "=\"" << volume->source.mesh_offset(0) << "\"/>\n";
+                                    stream << prefix << SOURCE_OFFSET_Y_KEY  << "\" " << VALUE_ATTR << "=\"" << volume->source.mesh_offset(1) << "\"/>\n";
+                                    stream << prefix << SOURCE_OFFSET_Z_KEY  << "\" " << VALUE_ATTR << "=\"" << volume->source.mesh_offset(2) << "\"/>\n";
+                                }
+                                assert(! volume->source.is_converted_from_inches || ! volume->source.is_converted_from_meters);
+                                if (volume->source.is_converted_from_inches)
+                                    stream << prefix << SOURCE_IN_INCHES_KEY << "\" " << VALUE_ATTR << "=\"1\"/>\n";
+                                else if (volume->source.is_converted_from_meters)
+                                    stream << prefix << SOURCE_IN_METERS_KEY << "\" " << VALUE_ATTR << "=\"1\"/>\n";
+#if ENABLE_RELOAD_FROM_DISK_REWORK
+                                if (volume->source.is_from_builtin_objects)
+                                    stream << prefix << SOURCE_IS_BUILTIN_VOLUME_KEY << "\" " << VALUE_ATTR << "=\"1\"/>\n";
+#endif // ENABLE_RELOAD_FROM_DISK_REWORK
+                            }
 
                     // stores volume's config data
                     for (const std::string& key : volume->config.keys()) {
@@ -3201,6 +3227,36 @@ static void handle_legacy_project_loaded(unsigned int version_project_file, Dyna
     }
 }
 
+bool is_project_3mf(const std::string& filename)
+{
+    mz_zip_archive archive;
+    mz_zip_zero_struct(&archive);
+
+    if (!open_zip_reader(&archive, filename))
+        return false;
+
+    mz_uint num_entries = mz_zip_reader_get_num_files(&archive);
+
+    // loop the entries to search for config
+    mz_zip_archive_file_stat stat;
+    bool config_found = false;
+    for (mz_uint i = 0; i < num_entries; ++i) {
+        if (mz_zip_reader_file_stat(&archive, i, &stat)) {
+            std::string name(stat.m_filename);
+            std::replace(name.begin(), name.end(), '\\', '/');
+
+            if (boost::algorithm::iequals(name, PRINT_CONFIG_FILE)) {
+                config_found = true;
+                break;
+            }
+        }
+    }
+
+    close_zip_reader(&archive);
+
+    return config_found;
+}
+
 bool load_3mf(const char* path, DynamicPrintConfig& config, ConfigSubstitutionContext& config_substitutions, Model* model, bool check_version)
 {
     if (path == nullptr || model == nullptr)
diff --git a/src/libslic3r/Format/3mf.hpp b/src/libslic3r/Format/3mf.hpp
index b91e90da7..5c2a2e672 100644
--- a/src/libslic3r/Format/3mf.hpp
+++ b/src/libslic3r/Format/3mf.hpp
@@ -29,6 +29,9 @@ namespace Slic3r {
     class DynamicPrintConfig;
     struct ThumbnailData;
 
+    // Returns true if the 3mf file with the given filename is a PrusaSlicer project file (i.e. if it contains a config).
+    extern bool is_project_3mf(const std::string& filename);
+
     // Load the content of a 3mf file into the given model and preset bundle.
     extern bool load_3mf(const char* path, DynamicPrintConfig& config, ConfigSubstitutionContext& config_substitutions, Model* model, bool check_version);
 
diff --git a/src/libslic3r/Format/AMF.cpp b/src/libslic3r/Format/AMF.cpp
index a8b66b15b..f2a902758 100644
--- a/src/libslic3r/Format/AMF.cpp
+++ b/src/libslic3r/Format/AMF.cpp
@@ -657,11 +657,16 @@ void AMFParserContext::endElement(const char * /* name */)
         if (bool has_transform = !m_volume_transform.isApprox(Transform3d::Identity(), 1e-10); has_transform)
             m_volume->source.transform = Slic3r::Geometry::Transformation(m_volume_transform);
 
-        if (m_volume->source.input_file.empty() && (m_volume->type() == ModelVolumeType::MODEL_PART)) {
+#if ENABLE_RELOAD_FROM_DISK_REWORK
+        if (m_volume->source.input_file.empty()) {
+#else
+        if (m_volume->source.input_file.empty() && m_volume->type() == ModelVolumeType::MODEL_PART) {
+#endif // ENABLE_RELOAD_FROM_DISK_REWORK
             m_volume->source.object_idx = (int)m_model.objects.size() - 1;
             m_volume->source.volume_idx = (int)m_model.objects.back()->volumes.size() - 1;
             m_volume->center_geometry_after_creation();
-        } else
+        }
+        else
             // pass false if the mesh offset has been already taken from the data 
             m_volume->center_geometry_after_creation(m_volume->source.input_file.empty());
 
@@ -792,46 +797,44 @@ void AMFParserContext::endElement(const char * /* name */)
                     // Is this volume a modifier volume?
                     // "modifier" flag comes first in the XML file, so it may be later overwritten by the "type" flag.
 					m_volume->set_type((atoi(m_value[1].c_str()) == 1) ? ModelVolumeType::PARAMETER_MODIFIER : ModelVolumeType::MODEL_PART);
-                } else if (strcmp(opt_key, "volume_type") == 0) {
+                }
+                else if (strcmp(opt_key, "volume_type") == 0)
                     m_volume->set_type(ModelVolume::type_from_string(m_value[1]));
-                }
-                else if (strcmp(opt_key, "matrix") == 0) {
+                else if (strcmp(opt_key, "matrix") == 0)
                     m_volume_transform = Slic3r::Geometry::transform3d_from_string(m_value[1]);
-                }
-                else if (strcmp(opt_key, "source_file") == 0) {
+                else if (strcmp(opt_key, "source_file") == 0)
                     m_volume->source.input_file = m_value[1];
-                }
-                else if (strcmp(opt_key, "source_object_id") == 0) {
+                else if (strcmp(opt_key, "source_object_id") == 0)
                     m_volume->source.object_idx = ::atoi(m_value[1].c_str());
-                }
-                else if (strcmp(opt_key, "source_volume_id") == 0) {
+                else if (strcmp(opt_key, "source_volume_id") == 0)
                     m_volume->source.volume_idx = ::atoi(m_value[1].c_str());
-                }
-                else if (strcmp(opt_key, "source_offset_x") == 0) {
-                    m_volume->source.mesh_offset(0) = ::atof(m_value[1].c_str());
-                }
-                else if (strcmp(opt_key, "source_offset_y") == 0) {
-                    m_volume->source.mesh_offset(1) = ::atof(m_value[1].c_str());
-                }
-                else if (strcmp(opt_key, "source_offset_z") == 0) {
-                    m_volume->source.mesh_offset(2) = ::atof(m_value[1].c_str());
-                }
-                else if (strcmp(opt_key, "source_in_inches") == 0) {
+                else if (strcmp(opt_key, "source_offset_x") == 0)
+                    m_volume->source.mesh_offset.x() = ::atof(m_value[1].c_str());
+                else if (strcmp(opt_key, "source_offset_y") == 0)
+                    m_volume->source.mesh_offset.y() = ::atof(m_value[1].c_str());
+                else if (strcmp(opt_key, "source_offset_z") == 0)
+                    m_volume->source.mesh_offset.z() = ::atof(m_value[1].c_str());
+                else if (strcmp(opt_key, "source_in_inches") == 0)
                     m_volume->source.is_converted_from_inches = m_value[1] == "1";
-                }
-                else if (strcmp(opt_key, "source_in_meters") == 0) {
+                else if (strcmp(opt_key, "source_in_meters") == 0)
                     m_volume->source.is_converted_from_meters = m_value[1] == "1";
-                }
+#if ENABLE_RELOAD_FROM_DISK_REWORK
+                else if (strcmp(opt_key, "source_is_builtin_volume") == 0)
+                    m_volume->source.is_from_builtin_objects = m_value[1] == "1";
+#endif // ENABLE_RELOAD_FROM_DISK_REWORK
             }
-        } else if (m_path.size() == 3) {
+        }
+        else if (m_path.size() == 3) {
             if (m_path[1] == NODE_TYPE_MATERIAL) {
                 if (m_material)
                     m_material->attributes[m_value[0]] = m_value[1];
-            } else if (m_path[1] == NODE_TYPE_OBJECT) {
+            }
+            else if (m_path[1] == NODE_TYPE_OBJECT) {
                 if (m_object && m_value[0] == "name")
                     m_object->name = std::move(m_value[1]);
             }
-        } else if (m_path.size() == 5 && m_path[3] == NODE_TYPE_VOLUME) {
+        }
+        else if (m_path.size() == 5 && m_path[3] == NODE_TYPE_VOLUME) {
             if (m_volume && m_value[0] == "name")
                 m_volume->name = std::move(m_value[1]);
         }
@@ -919,7 +922,11 @@ bool load_amf_file(const char *path, DynamicPrintConfig *config, ConfigSubstitut
         unsigned int counter = 0;
         for (ModelVolume* v : o->volumes) {
             ++counter;
+#if ENABLE_RELOAD_FROM_DISK_REWORK
+            if (v->source.input_file.empty())
+#else
             if (v->source.input_file.empty() && v->type() == ModelVolumeType::MODEL_PART)
+#endif // ENABLE_RELOAD_FROM_DISK_REWORK
                 v->source.input_file = path;
             if (v->name.empty()) {
                 v->name = o->name;
@@ -1068,7 +1075,11 @@ bool load_amf_archive(const char* path, DynamicPrintConfig* config, ConfigSubsti
 
     for (ModelObject *o : model->objects)
         for (ModelVolume *v : o->volumes)
-            if (v->source.input_file.empty() && (v->type() == ModelVolumeType::MODEL_PART))
+#if ENABLE_RELOAD_FROM_DISK_REWORK
+            if (v->source.input_file.empty())
+#else
+            if (v->source.input_file.empty() && v->type() == ModelVolumeType::MODEL_PART)
+#endif // ENABLE_RELOAD_FROM_DISK_REWORK
                 v->source.input_file = path;
 
     return true;
@@ -1237,18 +1248,15 @@ bool store_amf(const char* path, Model* model, const DynamicPrintConfig* config,
             stream << "        <metadata type=\"slic3r.matrix\">";
             const Transform3d& matrix = volume->get_matrix() * volume->source.transform.get_matrix();
             stream << std::setprecision(std::numeric_limits<double>::max_digits10);
-            for (int r = 0; r < 4; ++r)
-            {
-                for (int c = 0; c < 4; ++c)
-                {
+            for (int r = 0; r < 4; ++r) {
+                for (int c = 0; c < 4; ++c) {
                     stream << matrix(r, c);
-                    if ((r != 3) || (c != 3))
+                    if (r != 3 || c != 3)
                         stream << " ";
                 }
             }
             stream << "</metadata>\n";
-            if (!volume->source.input_file.empty())
-            {
+            if (!volume->source.input_file.empty()) {
                 std::string input_file = xml_escape(fullpath_sources ? volume->source.input_file : boost::filesystem::path(volume->source.input_file).filename().string());
                 stream << "        <metadata type=\"slic3r.source_file\">" << input_file << "</metadata>\n";
                 stream << "        <metadata type=\"slic3r.source_object_id\">" << volume->source.object_idx << "</metadata>\n";
@@ -1262,12 +1270,16 @@ bool store_amf(const char* path, Model* model, const DynamicPrintConfig* config,
                 stream << "        <metadata type=\"slic3r.source_in_inches\">1</metadata>\n";
             else if (volume->source.is_converted_from_meters)
                 stream << "        <metadata type=\"slic3r.source_in_meters\">1</metadata>\n";
-			stream << std::setprecision(std::numeric_limits<float>::max_digits10);
+#if ENABLE_RELOAD_FROM_DISK_REWORK
+            if (volume->source.is_from_builtin_objects)
+                stream << "        <metadata type=\"slic3r.source_is_builtin_volume\">1</metadata>\n";
+#endif // ENABLE_RELOAD_FROM_DISK_REWORK
+            stream << std::setprecision(std::numeric_limits<float>::max_digits10);
             const indexed_triangle_set &its = volume->mesh().its;
             for (size_t i = 0; i < its.indices.size(); ++i) {
                 stream << "        <triangle>\n";
                 for (int j = 0; j < 3; ++j)
-                stream << "          <v" << j + 1 << ">" << its.indices[i][j] + vertices_offset << "</v" << j + 1 << ">\n";
+                    stream << "          <v" << j + 1 << ">" << its.indices[i][j] + vertices_offset << "</v" << j + 1 << ">\n";
                 stream << "        </triangle>\n";
             }
             stream << "      </volume>\n";
diff --git a/src/libslic3r/Format/SL1.cpp b/src/libslic3r/Format/SL1.cpp
index 6ed8c5ebe..6f1e95528 100644
--- a/src/libslic3r/Format/SL1.cpp
+++ b/src/libslic3r/Format/SL1.cpp
@@ -446,8 +446,8 @@ void fill_slicerconf(ConfMap &m, const SLAPrint &print)
 
 std::unique_ptr<sla::RasterBase> SL1Archive::create_raster() const
 {
-    sla::RasterBase::Resolution res;
-    sla::RasterBase::PixelDim   pxdim;
+    sla::Resolution res;
+    sla::PixelDim   pxdim;
     std::array<bool, 2>         mirror;
 
     double w  = m_cfg.display_width.getFloat();
@@ -468,8 +468,8 @@ std::unique_ptr<sla::RasterBase> SL1Archive::create_raster() const
         std::swap(pw, ph);
     }
 
-    res   = sla::RasterBase::Resolution{pw, ph};
-    pxdim = sla::RasterBase::PixelDim{w / pw, h / ph};
+    res   = sla::Resolution{pw, ph};
+    pxdim = sla::PixelDim{w / pw, h / ph};
     sla::RasterBase::Trafo tr{orientation, mirror};
 
     double gamma = m_cfg.gamma_correction.getFloat();
diff --git a/src/libslic3r/Format/SL1.hpp b/src/libslic3r/Format/SL1.hpp
index 46a82e1b8..e6c0ff089 100644
--- a/src/libslic3r/Format/SL1.hpp
+++ b/src/libslic3r/Format/SL1.hpp
@@ -15,27 +15,16 @@ protected:
     std::unique_ptr<sla::RasterBase> create_raster() const override;
     sla::RasterEncoder get_encoder() const override;
 
+    SLAPrinterConfig & cfg() { return m_cfg; }
+    const SLAPrinterConfig & cfg() const { return m_cfg; }
+
 public:
     
     SL1Archive() = default;
     explicit SL1Archive(const SLAPrinterConfig &cfg): m_cfg(cfg) {}
     explicit SL1Archive(SLAPrinterConfig &&cfg): m_cfg(std::move(cfg)) {}
     
-    void export_print(Zipper &zipper, const SLAPrint &print, const std::string &projectname = "");
-    void export_print(const std::string &fname, const SLAPrint &print, const std::string &projectname = "")
-    {
-        Zipper zipper(fname);
-        export_print(zipper, print, projectname);
-    }
-    
-    void apply(const SLAPrinterConfig &cfg) override
-    {
-        auto diff = m_cfg.diff(cfg);
-        if (!diff.empty()) {
-            m_cfg.apply_only(cfg, diff);
-            m_layers = {};
-        }
-    }
+    void export_print(Zipper &zipper, const SLAPrint &print, const std::string &projectname = "") override;
 };
     
 ConfigSubstitutions import_sla_archive(const std::string &zipfname, DynamicPrintConfig &out);
diff --git a/src/libslic3r/Format/SL1_SVG.cpp b/src/libslic3r/Format/SL1_SVG.cpp
new file mode 100644
index 000000000..0ea230611
--- /dev/null
+++ b/src/libslic3r/Format/SL1_SVG.cpp
@@ -0,0 +1,221 @@
+#include "SL1_SVG.hpp"
+#include "SLA/RasterBase.hpp"
+#include "libslic3r/LocalesUtils.hpp"
+#include "libslic3r/ClipperUtils.hpp"
+
+#include <limits>
+#include <cstdint>
+#include <algorithm>
+
+namespace Slic3r {
+
+namespace {
+
+size_t constexpr coord_t_bufsize = 40;
+
+char const* decimal_from(coord_t snumber, char* buffer)
+{
+    std::make_unsigned_t<coord_t> number = 0;
+
+    char* ret = buffer;
+
+    if( snumber < 0 ) {
+        *buffer++ = '-';
+        number = -snumber;
+    } else
+        number = snumber;
+
+    if( number == 0 ) {
+        *buffer++ = '0';
+    } else {
+        char* p_first = buffer;
+        while( number != 0 ) {
+            *buffer++ = '0' + number % 10;
+            number /= 10;
+        }
+        std::reverse( p_first, buffer );
+    }
+
+    *buffer = '\0';
+
+    return ret;
+}
+
+inline std::string coord2str(coord_t crd)
+{
+    char buf[coord_t_bufsize];
+    return decimal_from(crd, buf);
+}
+
+void transform(ExPolygon &ep, const sla::RasterBase::Trafo &tr, const BoundingBox &bb)
+{
+    if (tr.flipXY) {
+        for (auto &p : ep.contour.points) std::swap(p.x(), p.y());
+        for (auto &h : ep.holes)
+            for (auto &p : h.points) std::swap(p.x(), p.y());
+    }
+
+    if (tr.mirror_x){
+        for (auto &p : ep.contour.points) p.x() = bb.max.x() - p.x() + bb.min.x();
+        for (auto &h : ep.holes)
+            for (auto &p : h.points) p.x() = bb.max.x() - p.x() + bb.min.x();
+    }
+
+    if (tr.mirror_y){
+        for (auto &p : ep.contour.points) p.y() = bb.max.y() - p.y() + bb.min.y();
+        for (auto &h : ep.holes)
+            for (auto &p : h.points) p.y() = bb.max.y() - p.y() + bb.min.y();
+    }
+}
+
+void append_svg(std::string &buf, const Polygon &poly)
+{
+    if (poly.points.empty())
+        return;
+
+    auto c = poly.points.front();
+
+    char intbuf[coord_t_bufsize];
+
+    buf += std::string("<path d=\"M ") + decimal_from(c.x(), intbuf);
+    buf += std::string(" ") + decimal_from(c.y(), intbuf) + " m";
+
+    for (auto &p : poly) {
+        auto d = p - c;
+        if (d.squaredNorm() == 0) continue;
+        buf += " ";
+        buf += decimal_from(p.x() - c.x(), intbuf);
+        buf += " ";
+        buf += decimal_from(p.y() - c.y(), intbuf);
+        c = p;
+    }
+    buf += " z\""; // mark path as closed
+    buf += " />\n";
+}
+
+} // namespace
+
+// A fake raster from SVG
+class SVGRaster : public sla::RasterBase {
+    // Resolution here will be used for svg boundaries
+    BoundingBox     m_bb;
+    sla::Resolution m_res;
+    Trafo           m_trafo;
+    Vec2d           m_sc;
+
+    std::string m_svg;
+
+public:
+    SVGRaster(const BoundingBox &svgarea, sla::Resolution res, Trafo tr = {})
+        : m_bb{svgarea}
+        , m_res{res}
+        , m_trafo{tr}
+        , m_sc{double(m_res.width_px) / m_bb.size().x(), double(m_res.height_px) / m_bb.size().y()}
+    {
+        // Inside the svg header, the boundaries will be defined in mm to
+        // the actual bed size. The viewport is then defined to work with our
+        // scaled coordinates. All the exported polygons will be in these scaled
+        // coordinates but svg rendering software will interpret them correctly
+        // in mm due to the header's definition.
+        std::string wf = float_to_string_decimal_point(unscaled<float>(m_bb.size().x()));
+        std::string hf = float_to_string_decimal_point(unscaled<float>(m_bb.size().y()));
+        std::string w  = coord2str(coord_t(m_res.width_px));
+        std::string h  = coord2str(coord_t(m_res.height_px));
+
+        // Notice the header also defines the fill-rule as nonzero which should
+        // generate correct results for our ExPolygons.
+
+        // Add svg header.
+        m_svg =
+            "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>\n"
+            "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.0//EN\" \"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd\">\n"
+            "<svg height=\"" + hf + "mm" + "\" width=\"" + wf + "mm" + "\" viewBox=\"0 0 " + w + " " + h +
+            "\" style=\"fill: white; stroke: none; fill-rule: nonzero\" "
+            "xmlns=\"http://www.w3.org/2000/svg\" xmlns:svg=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\">\n";
+
+        // Add black background;
+        m_svg += "<rect fill='black' stroke='none' x='0' y='0' width='" + w + "' height='" + h + "'/>\n";
+    }
+
+    void draw(const ExPolygon& poly) override
+    {
+        auto cpoly = poly;
+
+        double tol = std::min(m_bb.size().x() / double(m_res.width_px),
+                              m_bb.size().y() / double(m_res.height_px));
+
+        ExPolygons cpolys = poly.simplify(tol);
+
+        for (auto &cpoly : cpolys) {
+            transform(cpoly, m_trafo, m_bb);
+
+            for (auto &p : cpoly.contour.points)
+                p = {std::round(p.x() * m_sc.x()), std::round(p.y() * m_sc.y())};
+
+            for (auto &h : cpoly.holes)
+                for (auto &p : h)
+                    p = {std::round(p.x() * m_sc.x()), std::round(p.y() * m_sc.y())};
+
+            append_svg(m_svg, cpoly.contour);
+            for (auto &h : cpoly.holes)
+                append_svg(m_svg, h);
+        }
+    }
+
+    Trafo trafo() const override { return m_trafo; }
+
+    sla::EncodedRaster encode(sla::RasterEncoder /*encoder*/) const override
+    {
+        std::vector<uint8_t> data;
+        constexpr const char finish[] = "</svg>\n";
+
+        data.reserve(m_svg.size() + std::size(finish));
+
+        std::copy(m_svg.begin(), m_svg.end(), std::back_inserter(data));
+        std::copy(finish, finish + std::size(finish) - 1, std::back_inserter(data));
+
+        return sla::EncodedRaster{std::move(data), "svg"};
+    }
+};
+
+std::unique_ptr<sla::RasterBase> SL1_SVGArchive::create_raster() const
+{
+    auto w = cfg().display_width.getFloat();
+    auto h = cfg().display_height.getFloat();
+
+//    auto res_x = size_t(cfg().display_pixels_x.getInt());
+//    auto res_y = size_t(cfg().display_pixels_y.getInt());
+    float precision_nm = scaled<float>(cfg().sla_output_precision.getFloat());
+    size_t res_x = std::round(scaled(w) / precision_nm);
+    size_t res_y = std::round(scaled(h) / precision_nm);
+
+    std::array<bool, 2>         mirror;
+
+    mirror[X] = cfg().display_mirror_x.getBool();
+    mirror[Y] = cfg().display_mirror_y.getBool();
+
+    auto ro = cfg().display_orientation.getInt();
+    sla::RasterBase::Orientation orientation =
+        ro == sla::RasterBase::roPortrait ? sla::RasterBase::roPortrait :
+                                            sla::RasterBase::roLandscape;
+
+    if (orientation == sla::RasterBase::roPortrait) {
+        std::swap(w, h);
+        std::swap(res_x, res_y);
+    }
+
+    BoundingBox svgarea{{0, 0}, {scaled(w), scaled(h)}};
+
+    sla::RasterBase::Trafo tr{orientation, mirror};
+
+    // Gamma does not really make sense in an svg, right?
+    // double gamma = cfg().gamma_correction.getFloat();
+    return std::make_unique<SVGRaster>(svgarea, sla::Resolution{res_x, res_y}, tr);
+}
+
+sla::RasterEncoder SL1_SVGArchive::get_encoder() const
+{
+    return nullptr;
+}
+
+} // namespace Slic3r
diff --git a/src/libslic3r/Format/SL1_SVG.hpp b/src/libslic3r/Format/SL1_SVG.hpp
new file mode 100644
index 000000000..a3afbcdff
--- /dev/null
+++ b/src/libslic3r/Format/SL1_SVG.hpp
@@ -0,0 +1,22 @@
+#ifndef SL1_SVG_HPP
+#define SL1_SVG_HPP
+
+#include "SL1.hpp"
+
+namespace Slic3r {
+
+class SL1_SVGArchive: public SL1Archive {
+protected:
+
+    // Override the factory methods to produce svg instead of a real raster.
+    std::unique_ptr<sla::RasterBase> create_raster() const override;
+    sla::RasterEncoder get_encoder() const override;
+
+public:
+
+    using SL1Archive::SL1Archive;
+};
+
+} // namespace Slic3r
+
+#endif // SL1_SVG_HPP
diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index 5fac4b822..fb6dee37b 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -6,6 +6,7 @@
 #include "EdgeGrid.hpp"
 #include "Geometry/ConvexHull.hpp"
 #include "GCode/PrintExtents.hpp"
+#include "GCode/Thumbnails.hpp"
 #include "GCode/WipeTower.hpp"
 #include "ShortestPath.hpp"
 #include "Print.hpp"
@@ -26,7 +27,6 @@
 #include <boost/foreach.hpp>
 #include <boost/filesystem.hpp>
 #include <boost/log/trivial.hpp>
-#include <boost/beast/core/detail/base64.hpp>
 
 #include <boost/nowide/iostream.hpp>
 #include <boost/nowide/cstdio.hpp>
@@ -54,8 +54,6 @@
 
 #include <Shiny/Shiny.h>
 
-#include "miniz_extension.hpp"
-
 using namespace std::literals::string_view_literals;
 
 #if 0
@@ -156,63 +154,52 @@ namespace Slic3r {
 
     std::string Wipe::wipe(GCode& gcodegen, bool toolchange)
     {
-        std::string gcode;
+        std::string     gcode;
+        const Extruder &extruder = *gcodegen.writer().extruder();
 
-        /*  Reduce feedrate a bit; travel speed is often too high to move on existing material.
-            Too fast = ripping of existing material; too slow = short wipe path, thus more blob.  */
-        double wipe_speed = gcodegen.writer().config.travel_speed.value * 0.8;
-
-        // get the retraction length
-        double length = toolchange
-            ? gcodegen.writer().extruder()->retract_length_toolchange()
-            : gcodegen.writer().extruder()->retract_length();
-        // Shorten the retraction length by the amount already retracted before wipe.
-        length *= (1. - gcodegen.writer().extruder()->retract_before_wipe());
-
-        if (length > 0) {
-            /*  Calculate how long we need to travel in order to consume the required
-                amount of retraction. In other words, how far do we move in XY at wipe_speed
-                for the time needed to consume retract_length at retract_speed?  */
-            double wipe_dist = scale_(length / gcodegen.writer().extruder()->retract_speed() * wipe_speed);
-
-            /*  Take the stored wipe path and replace first point with the current actual position
-                (they might be different, for example, in case of loop clipping).  */
-            Polyline wipe_path;
-            wipe_path.append(gcodegen.last_pos());
-            wipe_path.append(
-                this->path.points.begin() + 1,
-                this->path.points.end()
-            );
-
-            wipe_path.clip_end(wipe_path.length() - wipe_dist);
-
-            // subdivide the retraction in segments
-            if (!wipe_path.empty()) {
-                // add tag for processor
+        // Remaining quantized retraction length.
+        if (double retract_length = extruder.retract_to_go(toolchange ? extruder.retract_length_toolchange() : extruder.retract_length()); 
+            retract_length > 0 && this->path.size() >= 2) {
+            // Reduce feedrate a bit; travel speed is often too high to move on existing material.
+            // Too fast = ripping of existing material; too slow = short wipe path, thus more blob.
+            const double wipe_speed = gcodegen.writer().config.travel_speed.value * 0.8;
+            // Reduce retraction length a bit to avoid effective retraction speed to be greater than the configured one
+            // due to rounding (TODO: test and/or better math for this).
+            const double xy_to_e    = 0.95 * extruder.retract_speed() / wipe_speed;
+            // Start with the current position, which may be different from the wipe path start in case of loop clipping.
+            Vec2d prev = gcodegen.point_to_gcode_quantized(gcodegen.last_pos());
+            auto  it   = this->path.points.begin();
+            Vec2d p    = gcodegen.point_to_gcode_quantized(*(++ it));
+            if (p != prev) {
                 gcode += ";" + GCodeProcessor::reserved_tag(GCodeProcessor::ETags::Wipe_Start) + "\n";
-                for (const Line& line : wipe_path.lines()) {
-                    double segment_length = line.length();
-                    /*  Reduce retraction length a bit to avoid effective retraction speed to be greater than the configured one
-                        due to rounding (TODO: test and/or better math for this)  */
-                    double dE = length * (segment_length / wipe_dist) * 0.95;
+                auto  end  = this->path.points.end();
+                bool  done = false;
+                for (; it != end && ! done; ++ it) {
+                    p = gcodegen.point_to_gcode_quantized(*it);
+                    double segment_length = (p - prev).norm();
+                    double dE = GCodeFormatter::quantize_e(xy_to_e * segment_length);
+                    if (dE > retract_length - EPSILON) {
+                        if (dE > retract_length + EPSILON)
+                            // Shorten the segment.
+                            p = prev + (p - prev) * (retract_length / dE);
+                        dE   = retract_length;
+                        done = true;
+                    }
                     //FIXME one shall not generate the unnecessary G1 Fxxx commands, here wipe_speed is a constant inside this cycle.
                     // Is it here for the cooling markers? Or should it be outside of the cycle?
-                    gcode += gcodegen.writer().set_speed(wipe_speed * 60, "", gcodegen.enable_cooling_markers() ? ";_WIPE" : "");
-                    gcode += gcodegen.writer().extrude_to_xy(
-                        gcodegen.point_to_gcode(line.b),
-                        -dE,
-                        "wipe and retract"
-                    );
+                    gcode += gcodegen.writer().set_speed(wipe_speed * 60, {}, gcodegen.enable_cooling_markers() ? ";_WIPE" : "");
+                    gcode += gcodegen.writer().extrude_to_xy(p, -dE, "wipe and retract");
+                    prev = p;
+                    retract_length -= dE;
                 }
                 // add tag for processor
                 gcode += ";" + GCodeProcessor::reserved_tag(GCodeProcessor::ETags::Wipe_End) + "\n";
-                gcodegen.set_last_pos(wipe_path.points.back());
+                gcodegen.set_last_pos(gcodegen.gcode_to_point(prev));
             }
-
-            // prevent wiping again on same path
-            this->reset_path();
         }
 
+        // Prevent wiping again on the same path.
+        this->reset_path();
         return gcode;
     }
 
@@ -937,49 +924,6 @@ namespace DoExport {
 	    }
 	}
 
-	template<typename WriteToOutput, typename ThrowIfCanceledCallback>
-	static void export_thumbnails_to_file(ThumbnailsGeneratorCallback &thumbnail_cb, const std::vector<Vec2d> &sizes, WriteToOutput output, ThrowIfCanceledCallback throw_if_canceled)
-	{
-	    // Write thumbnails using base64 encoding
-	    if (thumbnail_cb != nullptr)
-	    {
-	        const size_t max_row_length = 78;
-	        ThumbnailsList thumbnails = thumbnail_cb(ThumbnailsParams{ sizes, true, true, true, true });
-	        for (const ThumbnailData& data : thumbnails)
-	        {
-	            if (data.is_valid())
-	            {
-	                size_t png_size = 0;
-	                void* png_data = tdefl_write_image_to_png_file_in_memory_ex((const void*)data.pixels.data(), data.width, data.height, 4, &png_size, MZ_DEFAULT_LEVEL, 1);
-	                if (png_data != nullptr)
-	                {
-	                    std::string encoded;
-	                    encoded.resize(boost::beast::detail::base64::encoded_size(png_size));
-	                    encoded.resize(boost::beast::detail::base64::encode((void*)&encoded[0], (const void*)png_data, png_size));
-
-	                    output((boost::format("\n;\n; thumbnail begin %dx%d %d\n") % data.width % data.height % encoded.size()).str().c_str());
-
-	                    unsigned int row_count = 0;
-	                    while (encoded.size() > max_row_length)
-	                    {
-	                        output((boost::format("; %s\n") % encoded.substr(0, max_row_length)).str().c_str());
-	                        encoded = encoded.substr(max_row_length);
-	                        ++row_count;
-	                    }
-
-	                    if (encoded.size() > 0)
-	                    	output((boost::format("; %s\n") % encoded).str().c_str());
-
-	                    output("; thumbnail end\n;\n");
-
-	                    mz_free(png_data);
-	                }
-	            }
-	            throw_if_canceled();
-	        }
-	    }
-	}
-
 	// Fill in print_statistics and return formatted string containing filament statistics to be inserted into G-code comment section.
     static std::string update_print_stats_and_format_filament_stats(
         const bool                   has_wipe_tower,
@@ -1163,9 +1107,16 @@ void GCode::_do_export(Print& print, GCodeOutputStream &file, ThumbnailsGenerato
     // Write information on the generator.
     file.write_format("; %s\n\n", Slic3r::header_slic3r_generated().c_str());
 
-    DoExport::export_thumbnails_to_file(thumbnail_cb, print.full_print_config().option<ConfigOptionPoints>("thumbnails")->values,
-        [&file](const char* sz) { file.write(sz); },
-        [&print]() { print.throw_if_canceled(); });
+    // Unit tests or command line slicing may not define "thumbnails" or "thumbnails_format".
+    // If "thumbnails_format" is not defined, export to PNG.
+    if (const auto [thumbnails, thumbnails_format] = std::make_pair(
+            print.full_print_config().option<ConfigOptionPoints>("thumbnails"),
+            print.full_print_config().option<ConfigOptionEnum<GCodeThumbnailsFormat>>("thumbnails_format"));
+        thumbnails)
+        GCodeThumbnails::export_thumbnails_to_file(
+            thumbnail_cb, thumbnails->values, thumbnails_format ? thumbnails_format->value : GCodeThumbnailsFormat::PNG,
+            [&file](const char* sz) { file.write(sz); },
+            [&print]() { print.throw_if_canceled(); });
 
     // Write notes (content of the Print Settings tab -> Notes)
     {
@@ -3047,13 +2998,15 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
     double path_length = 0.;
     {
         std::string comment = m_config.gcode_comments ? description : "";
-        for (const Line &line : path.polyline.lines()) {
-            const double line_length = line.length() * SCALING_FACTOR;
+        Vec2d prev = this->point_to_gcode_quantized(path.polyline.points.front());
+        auto  it   = path.polyline.points.begin();
+        auto  end  = path.polyline.points.end();
+        for (++ it; it != end; ++ it) {
+            Vec2d p = this->point_to_gcode_quantized(*it);
+            const double line_length = (p - prev).norm();
             path_length += line_length;
-            gcode += m_writer.extrude_to_xy(
-                this->point_to_gcode(line.b),
-                e_per_mm * line_length,
-                comment);
+            gcode += m_writer.extrude_to_xy(p, e_per_mm * line_length, comment);
+            prev = p;
         }
     }
     if (m_enable_cooling_markers)
@@ -3276,7 +3229,13 @@ std::string GCode::set_extruder(unsigned int extruder_id, double print_z)
 Vec2d GCode::point_to_gcode(const Point &point) const
 {
     Vec2d extruder_offset = EXTRUDER_CONFIG(extruder_offset);
-    return unscale(point) + m_origin - extruder_offset;
+    return unscaled<double>(point) + m_origin - extruder_offset;
+}
+
+Vec2d GCode::point_to_gcode_quantized(const Point &point) const
+{
+    Vec2d p = this->point_to_gcode(point);
+    return { GCodeFormatter::quantize_xyzf(p.x()), GCodeFormatter::quantize_xyzf(p.y()) };
 }
 
 // convert a model-space scaled point into G-code coordinates
diff --git a/src/libslic3r/GCode.hpp b/src/libslic3r/GCode.hpp
index f46558c35..c0e636c79 100644
--- a/src/libslic3r/GCode.hpp
+++ b/src/libslic3r/GCode.hpp
@@ -55,9 +55,9 @@ public:
     Polyline path;
     
     Wipe() : enable(false) {}
-    bool has_path() const { return !this->path.points.empty(); }
-    void reset_path() { this->path = Polyline(); }
-    std::string wipe(GCode &gcodegen, bool toolchange = false);
+    bool has_path() const { return ! this->path.empty(); }
+    void reset_path() { this->path.clear(); }
+    std::string wipe(GCode &gcodegen, bool toolchange);
 };
 
 class WipeTowerIntegration {
@@ -151,7 +151,10 @@ public:
     void            set_origin(const Vec2d &pointf);
     void            set_origin(const coordf_t x, const coordf_t y) { this->set_origin(Vec2d(x, y)); }
     const Point&    last_pos() const { return m_last_pos; }
+    // Convert coordinates of the active object to G-code coordinates, possibly adjusted for extruder offset.
     Vec2d           point_to_gcode(const Point &point) const;
+    // Convert coordinates of the active object to G-code coordinates, possibly adjusted for extruder offset and quantized to G-code resolution.
+    Vec2d           point_to_gcode_quantized(const Point &point) const;
     Point           gcode_to_point(const Vec2d &point) const;
     const FullPrintConfig &config() const { return m_config; }
     const Layer*    layer() const { return m_layer; }
diff --git a/src/libslic3r/GCode/GCodeProcessor.cpp b/src/libslic3r/GCode/GCodeProcessor.cpp
index 995964eb5..50c0ce4a5 100644
--- a/src/libslic3r/GCode/GCodeProcessor.cpp
+++ b/src/libslic3r/GCode/GCodeProcessor.cpp
@@ -1196,6 +1196,7 @@ void GCodeProcessor::reset()
     m_line_id = 0;
     m_last_line_id = 0;
     m_feedrate = 0.0f;
+    m_feed_multiply.reset();
     m_width = 0.0f;
     m_height = 0.0f;
     m_forced_width = 0.0f;
@@ -1698,6 +1699,7 @@ void GCodeProcessor::process_gcode_line(const GCodeReader::GCodeLine& line, bool
                         break;
                     case '2':
                         switch (cmd[3]) {
+                        case '0': { process_M220(line); break; } // Set Feedrate Percentage
                         case '1': { process_M221(line); break; } // Set extrude factor override percentage
                         default: break;
                         }
@@ -1955,7 +1957,7 @@ void GCodeProcessor::process_tags(const std::string_view comment, bool producers
             if (!m_result.spiral_vase_layers.empty() && m_end_position[Z] == m_result.spiral_vase_layers.back().first)
                 m_result.spiral_vase_layers.back().second.second = move_id;
             else
-                m_result.spiral_vase_layers.push_back({ m_end_position[Z], { move_id, move_id } });
+                m_result.spiral_vase_layers.push_back({ static_cast<float>(m_end_position[Z]), { move_id, move_id } });
         }
 #endif // ENABLE_SPIRAL_VASE_LAYERS
         return;
@@ -2498,14 +2500,14 @@ void GCodeProcessor::process_G1(const GCodeReader::GCodeLine& line)
 
     // updates feedrate from line, if present
     if (line.has_f())
-        m_feedrate = line.f() * MMMIN_TO_MMSEC;
+        m_feedrate = m_feed_multiply.current * line.f() * MMMIN_TO_MMSEC;
 
     // calculates movement deltas
     float max_abs_delta = 0.0f;
     AxisCoords delta_pos;
     for (unsigned char a = X; a <= E; ++a) {
         delta_pos[a] = m_end_position[a] - m_start_position[a];
-        max_abs_delta = std::max(max_abs_delta, std::abs(delta_pos[a]));
+        max_abs_delta = std::max<float>(max_abs_delta, std::abs(delta_pos[a]));
     }
 
     // no displacement, return
@@ -2615,7 +2617,7 @@ void GCodeProcessor::process_G1(const GCodeReader::GCodeLine& line)
             if (curr.abs_axis_feedrate[a] != 0.0f) {
                 float axis_max_feedrate = get_axis_max_feedrate(static_cast<PrintEstimatedStatistics::ETimeMode>(i), static_cast<Axis>(a));
                 if (axis_max_feedrate != 0.0f)
-                    min_feedrate_factor = std::min(min_feedrate_factor, axis_max_feedrate / curr.abs_axis_feedrate[a]);
+                    min_feedrate_factor = std::min<float>(min_feedrate_factor, axis_max_feedrate / curr.abs_axis_feedrate[a]);
             }
         }
 
@@ -2863,7 +2865,7 @@ void GCodeProcessor::process_G61(const GCodeReader::GCodeLine& line)
             modified = true;
         }
         if (line.has_f())
-            m_feedrate = line.f();
+            m_feedrate = m_feed_multiply.current * line.f();
 
         if (!modified)
             m_end_position = m_saved_position;
@@ -3136,6 +3138,20 @@ void GCodeProcessor::process_M205(const GCodeReader::GCodeLine& line)
     }
 }
 
+void GCodeProcessor::process_M220(const GCodeReader::GCodeLine& line)
+{
+    if (m_flavor != gcfMarlinLegacy && m_flavor != gcfMarlinFirmware)
+        return;
+
+    if (line.has('B'))
+        m_feed_multiply.saved = m_feed_multiply.current;
+    float value;
+    if (line.has_value('S', value))
+        m_feed_multiply.current = value * 0.01f;
+    if (line.has('R'))
+        m_feed_multiply.current = m_feed_multiply.saved;
+}
+
 void GCodeProcessor::process_M221(const GCodeReader::GCodeLine& line)
 {
     float value_s;
@@ -3279,7 +3295,7 @@ void GCodeProcessor::store_move_vertex(EMoveType type)
 #else
         Vec3f(m_end_position[X], m_end_position[Y], m_processing_start_custom_gcode ? m_first_layer_height : m_end_position[Z]) + m_extruder_offsets[m_extruder_id],
 #endif // ENABLE_Z_OFFSET_CORRECTION
-        m_end_position[E] - m_start_position[E],
+        static_cast<float>(m_end_position[E] - m_start_position[E]),
         m_feedrate,
         m_width,
         m_height,
diff --git a/src/libslic3r/GCode/GCodeProcessor.hpp b/src/libslic3r/GCode/GCodeProcessor.hpp
index 153f4a9c5..25375f61b 100644
--- a/src/libslic3r/GCode/GCodeProcessor.hpp
+++ b/src/libslic3r/GCode/GCodeProcessor.hpp
@@ -178,7 +178,7 @@ namespace Slic3r {
 #endif // ENABLE_GCODE_VIEWER_DATA_CHECKING
 
     private:
-        using AxisCoords = std::array<float, 4>;
+        using AxisCoords = std::array<double, 4>;
         using ExtruderColors = std::vector<unsigned char>;
         using ExtruderTemps = std::vector<float>;
 
@@ -525,6 +525,17 @@ namespace Slic3r {
         unsigned int m_line_id;
         unsigned int m_last_line_id;
         float m_feedrate; // mm/s
+        struct FeedMultiply
+        {
+            float current; // percentage
+            float saved;   // percentage
+
+            void reset() {
+                current = 1.0f;
+                saved = 1.0f;
+            }
+        };
+        FeedMultiply m_feed_multiply;
         float m_width; // mm
         float m_height; // mm
         float m_forced_width; // mm
@@ -719,6 +730,9 @@ namespace Slic3r {
         // Advanced settings
         void process_M205(const GCodeReader::GCodeLine& line);
 
+        // Set Feedrate Percentage
+        void process_M220(const GCodeReader::GCodeLine& line);
+
         // Set extrude factor override percentage
         void process_M221(const GCodeReader::GCodeLine& line);
 
diff --git a/src/libslic3r/GCode/Thumbnails.cpp b/src/libslic3r/GCode/Thumbnails.cpp
new file mode 100644
index 000000000..8d70539b7
--- /dev/null
+++ b/src/libslic3r/GCode/Thumbnails.cpp
@@ -0,0 +1,119 @@
+#include "Thumbnails.hpp"
+#include "../miniz_extension.hpp"
+
+#include <qoi/qoi.h>
+#include <jpeglib.h>
+#include <jerror.h>
+
+namespace Slic3r::GCodeThumbnails {
+
+using namespace std::literals;
+
+struct CompressedPNG : CompressedImageBuffer 
+{
+    ~CompressedPNG() override { if (data) mz_free(data); }
+    std::string_view tag() const override { return "thumbnail"sv; }
+};
+
+struct CompressedJPG : CompressedImageBuffer
+{
+    ~CompressedJPG() override { free(data); }
+    std::string_view tag() const override { return "thumbnail_JPG"sv; }
+};
+
+struct CompressedQOI : CompressedImageBuffer 
+{
+    ~CompressedQOI() override { free(data); }
+    std::string_view tag() const override { return "thumbnail_QOI"sv; }
+};
+
+std::unique_ptr<CompressedImageBuffer> compress_thumbnail_png(const ThumbnailData &data)
+{
+    auto out = std::make_unique<CompressedPNG>();
+    out->data = tdefl_write_image_to_png_file_in_memory_ex((const void*)data.pixels.data(), data.width, data.height, 4, &out->size, MZ_DEFAULT_LEVEL, 1);
+    return out;
+}
+
+std::unique_ptr<CompressedImageBuffer> compress_thumbnail_jpg(const ThumbnailData& data)
+{
+    // Take vector of RGBA pixels and flip the image vertically
+    std::vector<unsigned char> rgba_pixels(data.pixels.size());
+    const unsigned int row_size = data.width * 4;
+    for (unsigned int y = 0; y < data.height; ++y) {
+        ::memcpy(rgba_pixels.data() + (data.height - y - 1) * row_size, data.pixels.data() + y * row_size, row_size);
+    }
+
+    // Store pointers to scanlines start for later use
+    std::vector<unsigned char*> rows_ptrs;
+    rows_ptrs.reserve(data.height);
+    for (unsigned int y = 0; y < data.height; ++y) {
+        rows_ptrs.emplace_back(&rgba_pixels[y * row_size]);
+    }
+
+    std::vector<unsigned char> compressed_data(data.pixels.size());
+    unsigned char* compressed_data_ptr = compressed_data.data();
+    unsigned long compressed_data_size = data.pixels.size();
+
+    jpeg_error_mgr err;
+    jpeg_compress_struct info;
+    info.err = jpeg_std_error(&err);
+    jpeg_create_compress(&info);
+    jpeg_mem_dest(&info, &compressed_data_ptr, &compressed_data_size);
+
+    info.image_width = data.width;
+    info.image_height = data.height;
+    info.input_components = 4;
+    info.in_color_space = JCS_EXT_RGBA;
+
+    jpeg_set_defaults(&info);
+    jpeg_set_quality(&info, 85, TRUE);
+    jpeg_start_compress(&info, TRUE);
+
+    jpeg_write_scanlines(&info, rows_ptrs.data(), data.height);
+    jpeg_finish_compress(&info);
+    jpeg_destroy_compress(&info);
+
+    // FIXME -> Add error checking
+
+    auto out = std::make_unique<CompressedJPG>();
+    out->data = malloc(compressed_data_size);
+    out->size = size_t(compressed_data_size);
+    ::memcpy(out->data, (const void*)compressed_data.data(), out->size);
+    return out;
+}
+
+std::unique_ptr<CompressedImageBuffer> compress_thumbnail_qoi(const ThumbnailData &data)
+{
+    qoi_desc desc;
+    desc.width      = data.width;
+    desc.height     = data.height;
+    desc.channels   = 4;
+    desc.colorspace = QOI_SRGB;
+
+    // Take vector of RGBA pixels and flip the image vertically
+    std::vector<uint8_t> rgba_pixels(data.pixels.size() * 4);
+    size_t row_size = data.width * 4;
+    for (size_t y = 0; y < data.height; ++ y)
+        memcpy(rgba_pixels.data() + (data.height - y - 1) * row_size, data.pixels.data() + y * row_size, row_size);
+    
+    auto out = std::make_unique<CompressedQOI>();
+    int  size;
+    out->data = qoi_encode((const void*)rgba_pixels.data(), &desc, &size);
+    out->size = size;
+    return out;
+}
+
+std::unique_ptr<CompressedImageBuffer> compress_thumbnail(const ThumbnailData &data, GCodeThumbnailsFormat format)
+{
+    switch (format) {
+        case GCodeThumbnailsFormat::PNG:
+        default:
+            return compress_thumbnail_png(data);
+        case GCodeThumbnailsFormat::JPG:
+            return compress_thumbnail_jpg(data);
+        case GCodeThumbnailsFormat::QOI:
+            return compress_thumbnail_qoi(data);
+    }
+}
+
+} // namespace Slic3r::GCodeThumbnails
diff --git a/src/libslic3r/GCode/Thumbnails.hpp b/src/libslic3r/GCode/Thumbnails.hpp
new file mode 100644
index 000000000..30bb6b653
--- /dev/null
+++ b/src/libslic3r/GCode/Thumbnails.hpp
@@ -0,0 +1,60 @@
+#ifndef slic3r_GCodeThumbnails_hpp_
+#define slic3r_GCodeThumbnails_hpp_
+
+#include "../Point.hpp"
+#include "../PrintConfig.hpp"
+#include "ThumbnailData.hpp"
+
+#include <vector>
+#include <memory>
+#include <string_view>
+
+#include <boost/beast/core/detail/base64.hpp>
+
+namespace Slic3r::GCodeThumbnails {
+
+struct CompressedImageBuffer
+{
+    void       *data { nullptr };
+    size_t      size { 0 };
+    virtual ~CompressedImageBuffer() {}
+    virtual std::string_view tag() const = 0;
+};
+
+std::unique_ptr<CompressedImageBuffer> compress_thumbnail(const ThumbnailData &data, GCodeThumbnailsFormat format);
+
+template<typename WriteToOutput, typename ThrowIfCanceledCallback>
+inline void export_thumbnails_to_file(ThumbnailsGeneratorCallback &thumbnail_cb, const std::vector<Vec2d> &sizes, GCodeThumbnailsFormat format, WriteToOutput output, ThrowIfCanceledCallback throw_if_canceled)
+{
+    // Write thumbnails using base64 encoding
+    if (thumbnail_cb != nullptr) {
+        static constexpr const size_t max_row_length = 78;
+        ThumbnailsList thumbnails = thumbnail_cb(ThumbnailsParams{ sizes, true, true, true, true });
+        for (const ThumbnailData& data : thumbnails)
+            if (data.is_valid()) {
+                auto compressed = compress_thumbnail(data, format);
+                if (compressed->data && compressed->size) {
+                    std::string encoded;
+                    encoded.resize(boost::beast::detail::base64::encoded_size(compressed->size));
+                    encoded.resize(boost::beast::detail::base64::encode((void*)encoded.data(), (const void*)compressed->data, compressed->size));
+
+                    output((boost::format("\n;\n; %s begin %dx%d %d\n") % compressed->tag() % data.width % data.height % encoded.size()).str().c_str());
+
+                    while (encoded.size() > max_row_length) {
+                        output((boost::format("; %s\n") % encoded.substr(0, max_row_length)).str().c_str());
+                        encoded = encoded.substr(max_row_length);
+                    }
+
+                    if (encoded.size() > 0)
+                        output((boost::format("; %s\n") % encoded).str().c_str());
+
+                    output((boost::format("; %s end\n;\n") % compressed->tag()).str().c_str());
+                }
+                throw_if_canceled();
+            }
+    }
+}
+
+} // namespace Slic3r::GCodeThumbnails
+
+#endif // slic3r_GCodeThumbnails_hpp_
diff --git a/src/libslic3r/GCode/ToolOrdering.cpp b/src/libslic3r/GCode/ToolOrdering.cpp
index 9dc9f3f96..870096bb9 100644
--- a/src/libslic3r/GCode/ToolOrdering.cpp
+++ b/src/libslic3r/GCode/ToolOrdering.cpp
@@ -74,7 +74,7 @@ static double calc_max_layer_height(const PrintConfig &config, double max_object
 {
     double max_layer_height = std::numeric_limits<double>::max();
     for (size_t i = 0; i < config.nozzle_diameter.values.size(); ++ i) {
-        double mlh = config.max_layer_height.values[i];
+        double mlh = config.max_layer_height.get_at(i);
         if (mlh == 0.)
             mlh = 0.75 * config.nozzle_diameter.values[i];
         max_layer_height = std::min(max_layer_height, mlh);
diff --git a/src/libslic3r/GCodeWriter.cpp b/src/libslic3r/GCodeWriter.cpp
index 233976b19..c5279c0f5 100644
--- a/src/libslic3r/GCodeWriter.cpp
+++ b/src/libslic3r/GCodeWriter.cpp
@@ -79,7 +79,7 @@ std::string GCodeWriter::postamble() const
 std::string GCodeWriter::set_temperature(unsigned int temperature, bool wait, int tool) const
 {
     if (wait && (FLAVOR_IS(gcfMakerWare) || FLAVOR_IS(gcfSailfish)))
-        return "";
+        return {};
     
     std::string code, comment;
     if (wait && FLAVOR_IS_NOT(gcfTeacup) && FLAVOR_IS_NOT(gcfRepRapFirmware)) {
@@ -192,32 +192,18 @@ std::string GCodeWriter::set_acceleration(unsigned int acceleration)
 
 std::string GCodeWriter::reset_e(bool force)
 {
-    if (FLAVOR_IS(gcfMach3)
-        || FLAVOR_IS(gcfMakerWare)
-        || FLAVOR_IS(gcfSailfish))
-        return "";
-    
-    if (m_extruder != nullptr) {
-        if (m_extruder->E() == 0. && ! force)
-            return "";
-        m_extruder->reset_E();
-    }
-
-    if (! m_extrusion_axis.empty() && ! this->config.use_relative_e_distances) {
-        std::ostringstream gcode;
-        gcode << "G92 " << m_extrusion_axis << "0";
-        if (this->config.gcode_comments) gcode << " ; reset extrusion distance";
-        gcode << "\n";
-        return gcode.str();
-    } else {
-        return "";
-    }
+    return
+        FLAVOR_IS(gcfMach3) || FLAVOR_IS(gcfMakerWare) || FLAVOR_IS(gcfSailfish) || this->config.use_relative_e_distances ||
+        (m_extruder != nullptr && ! m_extruder->reset_E() && ! force) || 
+        m_extrusion_axis.empty() ?
+        std::string{} :
+        std::string("G92 ") + m_extrusion_axis + (this->config.gcode_comments ? "0 ; reset extrusion distance\n" : "0\n");
 }
 
 std::string GCodeWriter::update_progress(unsigned int num, unsigned int tot, bool allow_100) const
 {
     if (FLAVOR_IS_NOT(gcfMakerWare) && FLAVOR_IS_NOT(gcfSailfish))
-        return "";
+        return {};
     
     unsigned int percent = (unsigned int)floor(100.0 * num / tot + 0.5);
     if (!allow_100) percent = std::min(percent, (unsigned int)99);
@@ -269,8 +255,8 @@ std::string GCodeWriter::set_speed(double F, const std::string &comment, const s
 
 std::string GCodeWriter::travel_to_xy(const Vec2d &point, const std::string &comment)
 {
-    m_pos(0) = point(0);
-    m_pos(1) = point(1);
+    m_pos.x() = point.x();
+    m_pos.y() = point.y();
     
     GCodeG1Formatter w;
     w.emit_xy(point);
@@ -290,9 +276,9 @@ std::string GCodeWriter::travel_to_xyz(const Vec3d &point, const std::string &co
         don't perform the Z move but we only move in the XY plane and
         adjust the nominal Z by reducing the lift amount that will be 
         used for unlift. */
-    if (!this->will_move_z(point(2))) {
-        double nominal_z = m_pos(2) - m_lifted;
-        m_lifted -= (point(2) - nominal_z);
+    if (!this->will_move_z(point.z())) {
+        double nominal_z = m_pos.z() - m_lifted;
+        m_lifted -= (point.z() - nominal_z);
         // In case that retract_lift == layer_height we could end up with almost zero in_m_lifted
         // and a retract could be skipped (https://github.com/prusa3d/PrusaSlicer/issues/2154
         if (std::abs(m_lifted) < EPSILON)
@@ -318,11 +304,11 @@ std::string GCodeWriter::travel_to_z(double z, const std::string &comment)
         we don't perform the move but we only adjust the nominal Z by
         reducing the lift amount that will be used for unlift. */
     if (!this->will_move_z(z)) {
-        double nominal_z = m_pos(2) - m_lifted;
+        double nominal_z = m_pos.z() - m_lifted;
         m_lifted -= (z - nominal_z);
         if (std::abs(m_lifted) < EPSILON)
             m_lifted = 0.;
-        return "";
+        return {};
     }
     
     /*  In all the other cases, we perform an actual Z move and cancel
@@ -333,7 +319,7 @@ std::string GCodeWriter::travel_to_z(double z, const std::string &comment)
 
 std::string GCodeWriter::_travel_to_z(double z, const std::string &comment)
 {
-    m_pos(2) = z;
+    m_pos.z() = z;
 
     double speed = this->config.travel_speed_z.value;
     if (speed == 0.)
@@ -351,8 +337,8 @@ bool GCodeWriter::will_move_z(double z) const
     /* If target Z is lower than current Z but higher than nominal Z
         we don't perform an actual Z move. */
     if (m_lifted > 0) {
-        double nominal_z = m_pos(2) - m_lifted;
-        if (z >= nominal_z && z <= m_pos(2))
+        double nominal_z = m_pos.z() - m_lifted;
+        if (z >= nominal_z && z <= m_pos.z())
             return false;
     }
     return true;
@@ -360,17 +346,17 @@ bool GCodeWriter::will_move_z(double z) const
 
 std::string GCodeWriter::extrude_to_xy(const Vec2d &point, double dE, const std::string &comment)
 {
-    m_pos(0) = point(0);
-    m_pos(1) = point(1);
-    m_extruder->extrude(dE);
+    m_pos.x() = point.x();
+    m_pos.y() = point.y();
 
     GCodeG1Formatter w;
     w.emit_xy(point);
-    w.emit_e(m_extrusion_axis, m_extruder->E());
+    w.emit_e(m_extrusion_axis, m_extruder->extrude(dE).second);
     w.emit_comment(this->config.gcode_comments, comment);
     return w.string();
 }
 
+#if 0
 std::string GCodeWriter::extrude_to_xyz(const Vec3d &point, double dE, const std::string &comment)
 {
     m_pos = point;
@@ -383,6 +369,7 @@ std::string GCodeWriter::extrude_to_xyz(const Vec3d &point, double dE, const std
     w.emit_comment(this->config.gcode_comments, comment);
     return w.string();
 }
+#endif
 
 std::string GCodeWriter::retract(bool before_wipe)
 {
@@ -422,14 +409,13 @@ std::string GCodeWriter::_retract(double length, double restart_extra, const std
         restart_extra = restart_extra * area;
     }
     
-
     std::string gcode;
-    if (double dE = m_extruder->retract(length, restart_extra);  dE != 0) {
+    if (auto [dE, emitE] = m_extruder->retract(length, restart_extra);  dE != 0) {
         if (this->config.use_firmware_retraction) {
             gcode = FLAVOR_IS(gcfMachinekit) ? "G22 ; retract\n" : "G10 ; retract\n";
         } else if (! m_extrusion_axis.empty()) {
             GCodeG1Formatter w;
-            w.emit_e(m_extrusion_axis, m_extruder->E());
+            w.emit_e(m_extrusion_axis, emitE);
             w.emit_f(m_extruder->retract_speed() * 60.);
             w.emit_comment(this->config.gcode_comments, comment);
             gcode = w.string();
@@ -449,14 +435,14 @@ std::string GCodeWriter::unretract()
     if (FLAVOR_IS(gcfMakerWare))
         gcode = "M101 ; extruder on\n";
     
-    if (double dE = m_extruder->unretract(); dE != 0) {
+    if (auto [dE, emitE] = m_extruder->unretract(); dE != 0) {
         if (this->config.use_firmware_retraction) {
             gcode += FLAVOR_IS(gcfMachinekit) ? "G23 ; unretract\n" : "G11 ; unretract\n";
             gcode += this->reset_e();
         } else if (! m_extrusion_axis.empty()) {
             // use G1 instead of G0 because G0 will blend the restart with the previous travel move
             GCodeG1Formatter w;
-            w.emit_e(m_extrusion_axis, m_extruder->E());
+            w.emit_e(m_extrusion_axis, emitE);
             w.emit_f(m_extruder->deretract_speed() * 60.);
             w.emit_comment(this->config.gcode_comments, " ; unretract");
             gcode += w.string();
@@ -476,21 +462,21 @@ std::string GCodeWriter::lift()
     {
         double above = this->config.retract_lift_above.get_at(m_extruder->id());
         double below = this->config.retract_lift_below.get_at(m_extruder->id());
-        if (m_pos(2) >= above && (below == 0 || m_pos(2) <= below))
+        if (m_pos.z() >= above && (below == 0 || m_pos.z() <= below))
             target_lift = this->config.retract_lift.get_at(m_extruder->id());
     }
     if (m_lifted == 0 && target_lift > 0) {
         m_lifted = target_lift;
-        return this->_travel_to_z(m_pos(2) + target_lift, "lift Z");
+        return this->_travel_to_z(m_pos.z() + target_lift, "lift Z");
     }
-    return "";
+    return {};
 }
 
 std::string GCodeWriter::unlift()
 {
     std::string gcode;
     if (m_lifted > 0) {
-        gcode += this->_travel_to_z(m_pos(2) - m_lifted, "restore layer Z");
+        gcode += this->_travel_to_z(m_pos.z() - m_lifted, "restore layer Z");
         m_lifted = 0;
     }
     return gcode;
diff --git a/src/libslic3r/GCodeWriter.hpp b/src/libslic3r/GCodeWriter.hpp
index e8a54737e..6c36c0d3a 100644
--- a/src/libslic3r/GCodeWriter.hpp
+++ b/src/libslic3r/GCodeWriter.hpp
@@ -61,7 +61,7 @@ public:
     std::string travel_to_z(double z, const std::string &comment = std::string());
     bool        will_move_z(double z) const;
     std::string extrude_to_xy(const Vec2d &point, double dE, const std::string &comment = std::string());
-    std::string extrude_to_xyz(const Vec3d &point, double dE, const std::string &comment = std::string());
+//    std::string extrude_to_xyz(const Vec3d &point, double dE, const std::string &comment = std::string());
     std::string retract(bool before_wipe = false);
     std::string retract_for_toolchange(bool before_wipe = false);
     std::string unretract();
@@ -121,6 +121,14 @@ public:
 //    static constexpr const int E_EXPORT_DIGITS    = 9;
 #endif
 
+    static constexpr const std::array<double, 10> pow_10    {   1.,     10.,    100.,    1000.,    10000.,    100000.,    1000000.,    10000000.,    100000000.,    1000000000.};
+    static constexpr const std::array<double, 10> pow_10_inv{1./1.,  1./10., 1./100., 1./1000., 1./10000., 1./100000., 1./1000000., 1./10000000., 1./100000000., 1./1000000000.};
+
+    // Quantize doubles to a resolution of the G-code.
+    static double                                 quantize(double v, size_t ndigits) { return std::round(v * pow_10[ndigits]) * pow_10_inv[ndigits]; }
+    static double                                 quantize_xyzf(double v) { return quantize(v, XYZF_EXPORT_DIGITS); }
+    static double                                 quantize_e(double v) { return quantize(v, E_EXPORT_DIGITS); }
+
     void emit_axis(const char axis, const double v, size_t digits);
 
     void emit_xy(const Vec2d &point) {
diff --git a/src/libslic3r/Preset.cpp b/src/libslic3r/Preset.cpp
index e65b604df..ca1363da2 100644
--- a/src/libslic3r/Preset.cpp
+++ b/src/libslic3r/Preset.cpp
@@ -484,7 +484,7 @@ static std::vector<std::string> s_Preset_printer_options {
     "cooling_tube_length", "high_current_on_filament_swap", "parking_pos_retraction", "extra_loading_move", "max_print_height",
     "default_print_profile", "inherits",
     "remaining_times", "silent_mode",
-    "machine_limits_usage", "thumbnails"
+    "machine_limits_usage", "thumbnails", "thumbnails_format"
 };
 
 static std::vector<std::string> s_Preset_sla_print_options {
@@ -573,7 +573,7 @@ static std::vector<std::string> s_Preset_sla_printer_options {
     "elefant_foot_min_width",
     "gamma_correction",
     "min_exposure_time", "max_exposure_time",
-    "min_initial_exposure_time", "max_initial_exposure_time",
+    "min_initial_exposure_time", "max_initial_exposure_time", "sla_archive_format", "sla_output_precision",
     //FIXME the print host keys are left here just for conversion from the Printer preset to Physical Printer preset.
     "print_host", "printhost_apikey", "printhost_cafile",
     "printer_notes",
diff --git a/src/libslic3r/Print.cpp b/src/libslic3r/Print.cpp
index dc47b382d..9f848b49b 100644
--- a/src/libslic3r/Print.cpp
+++ b/src/libslic3r/Print.cpp
@@ -130,7 +130,8 @@ bool Print::invalidate_state_by_config_options(const ConfigOptionResolver & /* n
         "start_gcode",
         "start_filament_gcode",
         "toolchange_gcode",
-        "threads",
+        "thumbnails",
+        "thumbnails_format",
         "use_firmware_retraction",
         "use_relative_e_distances",
         "use_volumetric_e",
diff --git a/src/libslic3r/Print.hpp b/src/libslic3r/Print.hpp
index b6e4802bb..c5e312a2b 100644
--- a/src/libslic3r/Print.hpp
+++ b/src/libslic3r/Print.hpp
@@ -346,10 +346,11 @@ private:
     friend class Print;
 
 	PrintObject(Print* print, ModelObject* model_object, const Transform3d& trafo, PrintInstances&& instances);
-    ~PrintObject() {
+    ~PrintObject() override {
         if (m_shared_regions && --m_shared_regions->m_ref_cnt == 0)
             delete m_shared_regions;
         clear_layers();
+        clear_support_layers();
     }
 
     void                    config_apply(const ConfigBase &other, bool ignore_nonexistent = false) { m_config.apply(other, ignore_nonexistent); }
diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index 1aaf8c1dd..5a674da84 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -43,7 +43,7 @@ static t_config_enum_values s_keys_map_PrinterTechnology {
 };
 CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(PrinterTechnology)
 
-static t_config_enum_values s_keys_map_GCodeFlavor {
+static const t_config_enum_values s_keys_map_GCodeFlavor {
     { "reprap",         gcfRepRapSprinter },
     { "reprapfirmware", gcfRepRapFirmware },
     { "repetier",       gcfRepetier },
@@ -59,14 +59,14 @@ static t_config_enum_values s_keys_map_GCodeFlavor {
 };
 CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(GCodeFlavor)
 
-static t_config_enum_values s_keys_map_MachineLimitsUsage {
+static const t_config_enum_values s_keys_map_MachineLimitsUsage {
     { "emit_to_gcode",      int(MachineLimitsUsage::EmitToGCode) },
     { "time_estimate_only", int(MachineLimitsUsage::TimeEstimateOnly) },
     { "ignore",             int(MachineLimitsUsage::Ignore) }
 };
 CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(MachineLimitsUsage)
 
-static t_config_enum_values s_keys_map_PrintHostType {
+static const t_config_enum_values s_keys_map_PrintHostType {
     { "prusalink",      htPrusaLink },
     { "octoprint",      htOctoPrint },
     { "duet",           htDuet },
@@ -77,20 +77,20 @@ static t_config_enum_values s_keys_map_PrintHostType {
 };
 CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(PrintHostType)
 
-static t_config_enum_values s_keys_map_AuthorizationType {
+static const t_config_enum_values s_keys_map_AuthorizationType {
     { "key",            atKeyPassword },
     { "user",           atUserPassword }
 };
 CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(AuthorizationType)
 
-static t_config_enum_values s_keys_map_FuzzySkinType {
+static const t_config_enum_values s_keys_map_FuzzySkinType {
     { "none",           int(FuzzySkinType::None) },
     { "external",       int(FuzzySkinType::External) },
     { "all",            int(FuzzySkinType::All) }
 };
 CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(FuzzySkinType)
 
-static t_config_enum_values s_keys_map_InfillPattern {
+static const t_config_enum_values s_keys_map_InfillPattern {
     { "rectilinear",        ipRectilinear },
     { "monotonic",          ipMonotonic },
     { "alignedrectilinear", ipAlignedRectilinear },
@@ -114,41 +114,41 @@ static t_config_enum_values s_keys_map_InfillPattern {
 };
 CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(InfillPattern)
 
-static t_config_enum_values s_keys_map_IroningType {
+static const t_config_enum_values s_keys_map_IroningType {
     { "top",            int(IroningType::TopSurfaces) },
     { "topmost",        int(IroningType::TopmostOnly) },
     { "solid",          int(IroningType::AllSolid) }
 };
 CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(IroningType)
 
-static t_config_enum_values s_keys_map_SlicingMode {
+static const t_config_enum_values s_keys_map_SlicingMode {
     { "regular",        int(SlicingMode::Regular) },
     { "even_odd",       int(SlicingMode::EvenOdd) },
     { "close_holes",    int(SlicingMode::CloseHoles) }
 };
 CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(SlicingMode)
 
-static t_config_enum_values s_keys_map_SupportMaterialPattern {
+static const t_config_enum_values s_keys_map_SupportMaterialPattern {
     { "rectilinear",        smpRectilinear },
     { "rectilinear-grid",   smpRectilinearGrid },
     { "honeycomb",          smpHoneycomb }
 };
 CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(SupportMaterialPattern)
 
-static t_config_enum_values s_keys_map_SupportMaterialStyle {
+static const t_config_enum_values s_keys_map_SupportMaterialStyle {
     { "grid",           smsGrid },
     { "snug",           smsSnug }
 };
 CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(SupportMaterialStyle)
 
-static t_config_enum_values s_keys_map_SupportMaterialInterfacePattern {
+static const t_config_enum_values s_keys_map_SupportMaterialInterfacePattern {
     { "auto",           smipAuto },
     { "rectilinear",    smipRectilinear },
     { "concentric",     smipConcentric }
 };
 CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(SupportMaterialInterfacePattern)
 
-static t_config_enum_values s_keys_map_SeamPosition {
+static const t_config_enum_values s_keys_map_SeamPosition {
     { "random",         spRandom },
     { "nearest",        spNearest },
     { "aligned",        spAligned },
@@ -190,6 +190,13 @@ static const t_config_enum_values s_keys_map_DraftShield = {
 };
 CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(DraftShield)
 
+static const t_config_enum_values s_keys_map_GCodeThumbnailsFormat = {
+    { "PNG", int(GCodeThumbnailsFormat::PNG) },
+    { "JPG", int(GCodeThumbnailsFormat::JPG) },
+    { "QOI", int(GCodeThumbnailsFormat::QOI) }
+};
+CONFIG_OPTION_ENUM_DEFINE_STATIC_MAPS(GCodeThumbnailsFormat)
+
 static const t_config_enum_values s_keys_map_ForwardCompatibilitySubstitutionRule = {
     { "disable",        ForwardCompatibilitySubstitutionRule::Disable },
     { "enable",         ForwardCompatibilitySubstitutionRule::Enable },
@@ -259,6 +266,16 @@ void PrintConfigDef::init_common_params()
     def->gui_type = ConfigOptionDef::GUIType::one_string;
     def->set_default_value(new ConfigOptionPoints());
 
+    def = this->add("thumbnails_format", coEnum);
+    def->label = L("Format of G-code thumbnails");
+    def->tooltip = L("Format of G-code thumbnails: PNG for best quality, JPG for smallest size, QOI for low memory firmware");
+    def->mode = comExpert;
+    def->enum_keys_map = &ConfigOptionEnum<GCodeThumbnailsFormat>::get_enum_values();
+    def->enum_values.push_back("PNG");
+    def->enum_values.push_back("JPG");
+    def->enum_values.push_back("QOI");
+    def->set_default_value(new ConfigOptionEnum<GCodeThumbnailsFormat>(GCodeThumbnailsFormat::PNG));
+
     def = this->add("layer_height", coFloat);
     def->label = L("Layer height");
     def->category = L("Layers and Perimeters");
@@ -3783,6 +3800,19 @@ void PrintConfigDef::init_sla_params()
     def->enum_labels.push_back(L("Fast"));
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionEnum<SLAMaterialSpeed>(slamsFast));
+
+    def = this->add("sla_archive_format", coString);
+    def->label = L("Format of the output SLA archive");
+    def->mode = comAdvanced;
+    def->set_default_value(new ConfigOptionString("SL1"));
+
+    def = this->add("sla_output_precision", coFloat);
+    def->label = L("SLA output precision");
+    def->tooltip = L("Minimum resolution in nanometers");
+    def->sidetext = L("mm");
+    def->min = SCALING_FACTOR;
+    def->mode = comExpert;
+    def->set_default_value(new ConfigOptionFloat(0.001));
 }
 
 void PrintConfigDef::handle_legacy(t_config_option_key &opt_key, std::string &value)
diff --git a/src/libslic3r/PrintConfig.hpp b/src/libslic3r/PrintConfig.hpp
index 2cc758e7b..b97168e84 100644
--- a/src/libslic3r/PrintConfig.hpp
+++ b/src/libslic3r/PrintConfig.hpp
@@ -131,6 +131,10 @@ enum DraftShield {
     dsDisabled, dsLimited, dsEnabled
 };
 
+enum class GCodeThumbnailsFormat {
+    PNG, JPG, QOI
+};
+
 #define CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS(NAME) \
     template<> const t_config_enum_names& ConfigOptionEnum<NAME>::get_enum_names(); \
     template<> const t_config_enum_values& ConfigOptionEnum<NAME>::get_enum_values();
@@ -152,6 +156,7 @@ CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS(SLADisplayOrientation)
 CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS(SLAPillarConnectionMode)
 CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS(BrimType)
 CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS(DraftShield)
+CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS(GCodeThumbnailsFormat)
 CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS(ForwardCompatibilitySubstitutionRule)
 
 #undef CONFIG_OPTION_ENUM_DECLARE_STATIC_MAPS
@@ -757,6 +762,8 @@ PRINT_CONFIG_CLASS_DERIVED_DEFINE(
     ((ConfigOptionInt,                standby_temperature_delta))
     ((ConfigOptionInts,               temperature))
     ((ConfigOptionInt,                threads))
+    ((ConfigOptionPoints,             thumbnails))
+    ((ConfigOptionEnum<GCodeThumbnailsFormat>,  thumbnails_format))
     ((ConfigOptionBools,              wipe))
     ((ConfigOptionBool,               wipe_tower))
     ((ConfigOptionFloat,              wipe_tower_x))
@@ -975,6 +982,8 @@ PRINT_CONFIG_CLASS_DEFINE(
     ((ConfigOptionFloat,                      max_exposure_time))
     ((ConfigOptionFloat,                      min_initial_exposure_time))
     ((ConfigOptionFloat,                      max_initial_exposure_time))
+    ((ConfigOptionString,                     sla_archive_format))
+    ((ConfigOptionFloat,                      sla_output_precision))
 )
 
 PRINT_CONFIG_CLASS_DERIVED_DEFINE0(
diff --git a/src/libslic3r/SLA/AGGRaster.hpp b/src/libslic3r/SLA/AGGRaster.hpp
index bc68cd377..7c8e71c2a 100644
--- a/src/libslic3r/SLA/AGGRaster.hpp
+++ b/src/libslic3r/SLA/AGGRaster.hpp
@@ -41,7 +41,7 @@ public:
     using TValue = typename TColor::value_type;
     using TPixel = typename PixelRenderer::pixel_type;
     using TRawBuffer = agg::rendering_buffer;
-    
+
 protected:
     
     Resolution m_resolution;
@@ -153,8 +153,8 @@ public:
     }
     
     Trafo trafo() const override { return m_trafo; }
-    Resolution resolution() const override { return m_resolution; }
-    PixelDim   pixel_dimensions() const override
+    Resolution resolution() const { return m_resolution; }
+    PixelDim   pixel_dimensions() const
     {
         return {SCALING_FACTOR / m_pxdim_scaled.w_mm,
                 SCALING_FACTOR / m_pxdim_scaled.h_mm};
@@ -186,11 +186,15 @@ class RasterGrayscaleAA : public _RasterGrayscaleAA {
     using typename Base::TValue;
 public:
     template<class GammaFn>
-    RasterGrayscaleAA(const RasterBase::Resolution &res,
-                      const RasterBase::PixelDim &  pd,
-                      const RasterBase::Trafo &     trafo,
-                      GammaFn &&                    fn)
-        : Base(res, pd, trafo, Colors<TColor>::White, Colors<TColor>::Black,
+    RasterGrayscaleAA(const Resolution        &res,
+                      const PixelDim          &pd,
+                      const RasterBase::Trafo &trafo,
+                      GammaFn                &&fn)
+        : Base(res,
+               pd,
+               trafo,
+               Colors<TColor>::White,
+               Colors<TColor>::Black,
                std::forward<GammaFn>(fn))
     {}
     
@@ -208,10 +212,10 @@ public:
 
 class RasterGrayscaleAAGammaPower: public RasterGrayscaleAA {
 public:
-    RasterGrayscaleAAGammaPower(const RasterBase::Resolution &res,
-                                const RasterBase::PixelDim &  pd,
-                                const RasterBase::Trafo &     trafo,
-                                double                        gamma = 1.)
+    RasterGrayscaleAAGammaPower(const Resolution        &res,
+                                const PixelDim          &pd,
+                                const RasterBase::Trafo &trafo,
+                                double                   gamma = 1.)
         : RasterGrayscaleAA(res, pd, trafo, agg::gamma_power(gamma))
     {}
 };
diff --git a/src/libslic3r/SLA/RasterBase.cpp b/src/libslic3r/SLA/RasterBase.cpp
index cc9aca027..0b6c45eff 100644
--- a/src/libslic3r/SLA/RasterBase.cpp
+++ b/src/libslic3r/SLA/RasterBase.cpp
@@ -68,10 +68,10 @@ EncodedRaster PPMRasterEncoder::operator()(const void *ptr, size_t w, size_t h,
 }
 
 std::unique_ptr<RasterBase> create_raster_grayscale_aa(
-    const RasterBase::Resolution &res,
-    const RasterBase::PixelDim &  pxdim,
-    double                        gamma,
-    const RasterBase::Trafo &     tr)
+    const Resolution        &res,
+    const PixelDim          &pxdim,
+    double                   gamma,
+    const RasterBase::Trafo &tr)
 {
     std::unique_ptr<RasterBase> rst;
     
diff --git a/src/libslic3r/SLA/RasterBase.hpp b/src/libslic3r/SLA/RasterBase.hpp
index 6439830fe..657fc865c 100644
--- a/src/libslic3r/SLA/RasterBase.hpp
+++ b/src/libslic3r/SLA/RasterBase.hpp
@@ -31,6 +31,27 @@ public:
     const char * extension() const { return m_ext.c_str(); }
 };
 
+/// Type that represents a resolution in pixels.
+struct Resolution {
+    size_t width_px = 0;
+    size_t height_px = 0;
+
+    Resolution() = default;
+    Resolution(size_t w, size_t h) : width_px(w), height_px(h) {}
+    size_t pixels() const { return width_px * height_px; }
+};
+
+/// Types that represents the dimension of a pixel in millimeters.
+struct PixelDim {
+    double w_mm = 1.;
+    double h_mm = 1.;
+
+    PixelDim() = default;
+    PixelDim(double px_width_mm, double px_height_mm)
+        : w_mm(px_width_mm), h_mm(px_height_mm)
+    {}
+};
+
 using RasterEncoder =
     std::function<EncodedRaster(const void *ptr, size_t w, size_t h, size_t num_components)>;
 
@@ -63,35 +84,14 @@ public:
         Point get_center() const { return {center_x, center_y}; }
     };
     
-    /// Type that represents a resolution in pixels.
-    struct Resolution {
-        size_t width_px = 0;
-        size_t height_px = 0;
-        
-        Resolution() = default;
-        Resolution(size_t w, size_t h) : width_px(w), height_px(h) {}
-        size_t pixels() const { return width_px * height_px; }
-    };
-    
-    /// Types that represents the dimension of a pixel in millimeters.
-    struct PixelDim {
-        double w_mm = 1.;
-        double h_mm = 1.;
-        
-        PixelDim() = default;
-        PixelDim(double px_width_mm, double px_height_mm)
-            : w_mm(px_width_mm), h_mm(px_height_mm)
-        {}
-    };
-    
     virtual ~RasterBase() = default;
     
     /// Draw a polygon with holes.
     virtual void draw(const ExPolygon& poly) = 0;
     
     /// Get the resolution of the raster.
-    virtual Resolution resolution() const = 0;
-    virtual PixelDim   pixel_dimensions() const = 0;
+//    virtual Resolution resolution() const = 0;
+//    virtual PixelDim   pixel_dimensions() const = 0;
     virtual Trafo      trafo() const = 0;
     
     virtual EncodedRaster encode(RasterEncoder encoder) const = 0;
@@ -109,10 +109,10 @@ std::ostream& operator<<(std::ostream &stream, const EncodedRaster &bytes);
 
 // If gamma is zero, thresholding will be performed which disables AA.
 std::unique_ptr<RasterBase> create_raster_grayscale_aa(
-    const RasterBase::Resolution &res,
-    const RasterBase::PixelDim &  pxdim,
-    double                        gamma = 1.0,
-    const RasterBase::Trafo &     tr    = {});
+    const Resolution        &res,
+    const PixelDim          &pxdim,
+    double                   gamma = 1.0,
+    const RasterBase::Trafo &tr    = {});
 
 }} // namespace Slic3r::sla
 
diff --git a/src/libslic3r/SLAPrint.cpp b/src/libslic3r/SLAPrint.cpp
index 55acd3846..7b78dfea2 100644
--- a/src/libslic3r/SLAPrint.cpp
+++ b/src/libslic3r/SLAPrint.cpp
@@ -1,6 +1,9 @@
 #include "SLAPrint.hpp"
 #include "SLAPrintSteps.hpp"
 
+#include "Format/SL1.hpp"
+#include "Format/SL1_SVG.hpp"
+
 #include "ClipperUtils.hpp"
 #include "Geometry.hpp"
 #include "MTUtils.hpp"
@@ -240,8 +243,13 @@ SLAPrint::ApplyStatus SLAPrint::apply(const Model &model, DynamicPrintConfig con
     m_material_config.apply_only(config, material_diff, true);
     // Handle changes to object config defaults
     m_default_object_config.apply_only(config, object_diff, true);
-    
-    if (m_printer) m_printer->apply(m_printer_config);
+
+    if (!m_archiver || !printer_diff.empty()) {
+        if (m_printer_config.sla_archive_format.value == "SL1")
+            m_archiver = std::make_unique<SL1Archive>(m_printer_config);
+        else if (m_printer_config.sla_archive_format.value == "SL2")
+            m_archiver = std::make_unique<SL1_SVGArchive>(m_printer_config);
+    }
 
     struct ModelObjectStatus {
         enum Status {
@@ -670,12 +678,6 @@ std::string SLAPrint::validate(std::string*) const
     return "";
 }
 
-void SLAPrint::set_printer(SLAArchive *arch)
-{
-    invalidate_step(slapsRasterize);
-    m_printer = arch;
-}
-
 bool SLAPrint::invalidate_step(SLAPrintStep step)
 {
     bool invalidated = Inherited::invalidate_step(step);
@@ -835,7 +837,9 @@ bool SLAPrint::invalidate_state_by_config_options(const std::vector<t_config_opt
         "display_pixels_y",
         "display_mirror_x",
         "display_mirror_y",
-        "display_orientation"
+        "display_orientation",
+        "sla_archive_format",
+        "sla_output_precision"
     };
 
     static std::unordered_set<std::string> steps_ignore = {
diff --git a/src/libslic3r/SLAPrint.hpp b/src/libslic3r/SLAPrint.hpp
index 0622bec4e..b2df0c4e9 100644
--- a/src/libslic3r/SLAPrint.hpp
+++ b/src/libslic3r/SLAPrint.hpp
@@ -399,8 +399,6 @@ protected:
 public:
     virtual ~SLAArchive() = default;
     
-    virtual void apply(const SLAPrinterConfig &cfg) = 0;
-    
     // Fn have to be thread safe: void(sla::RasterBase& raster, size_t lyrid);
     template<class Fn, class CancelFn, class EP = ExecutionTBB>
     void draw_layers(
@@ -422,6 +420,14 @@ public:
             },
             execution::max_concurrency(ep));
     }
+
+    // Export the print into an archive using the provided zipper.
+    // TODO: Use an archive writer interface instead of Zipper.
+    // This is quite limiting as the Zipper is a complete class, not an interface.
+    // The output can only be a zip archive.
+    virtual void export_print(Zipper            &zipper,
+                              const SLAPrint    &print,
+                              const std::string &projectname = "") = 0;
 };
 
 /**
@@ -527,8 +533,17 @@ public:
     // The aggregated and leveled print records from various objects.
     // TODO: use this structure for the preview in the future.
     const std::vector<PrintLayer>& print_layers() const { return m_printer_input; }
-    
-    void set_printer(SLAArchive *archiver);
+
+    void export_print(Zipper &zipper, const std::string &projectname = "")
+    {
+        m_archiver->export_print(zipper, *this, projectname);
+    }
+
+    void export_print(const std::string &fname, const std::string &projectname = "")
+    {
+        Zipper zipper(fname);
+        export_print(zipper, projectname);
+    }
     
 private:
     
@@ -550,7 +565,7 @@ private:
     std::vector<PrintLayer>         m_printer_input;
     
     // The archive object which collects the raster images after slicing
-    SLAArchive                     *m_printer = nullptr;
+    std::unique_ptr<SLAArchive>     m_archiver;
     
     // Estimated print time, material consumed.
     SLAPrintStatistics              m_print_statistics;
diff --git a/src/libslic3r/SLAPrintSteps.cpp b/src/libslic3r/SLAPrintSteps.cpp
index fa7348781..435e8c8e3 100644
--- a/src/libslic3r/SLAPrintSteps.cpp
+++ b/src/libslic3r/SLAPrintSteps.cpp
@@ -1044,7 +1044,7 @@ void SLAPrint::Steps::merge_slices_and_eval_stats() {
 // Rasterizing the model objects, and their supports
 void SLAPrint::Steps::rasterize()
 {
-    if(canceled() || !m_print->m_printer) return;
+    if(canceled() || !m_print->m_archiver) return;
 
     // coefficient to map the rasterization state (0-99) to the allocated
     // portion (slot) of the process state
@@ -1089,7 +1089,7 @@ void SLAPrint::Steps::rasterize()
     if(canceled()) return;
 
     // Print all the layers in parallel
-    m_print->m_printer->draw_layers(m_print->m_printer_input.size(), lvlfn,
+    m_print->m_archiver->draw_layers(m_print->m_printer_input.size(), lvlfn,
                                     [this]() { return canceled(); }, ex_tbb);
 }
 
diff --git a/src/libslic3r/SupportMaterial.cpp b/src/libslic3r/SupportMaterial.cpp
index 67bd2639b..195fc9e17 100644
--- a/src/libslic3r/SupportMaterial.cpp
+++ b/src/libslic3r/SupportMaterial.cpp
@@ -3754,6 +3754,7 @@ void modulate_extrusion_by_overlapping_layers(
             assert(path != nullptr);
             polylines.emplace_back(Polyline(std::move(path->polyline)));
             path_ends.emplace_back(std::pair<Point, Point>(polylines.back().points.front(), polylines.back().points.back()));
+            delete path;
         }
     }
     // Destroy the original extrusion paths, their polylines were moved to path_fragments already.
diff --git a/src/libslic3r/Technologies.hpp b/src/libslic3r/Technologies.hpp
index 5668c8b8b..345eba3ee 100644
--- a/src/libslic3r/Technologies.hpp
+++ b/src/libslic3r/Technologies.hpp
@@ -68,8 +68,16 @@
 #define ENABLE_WIPETOWER_OBJECTID_1000_REMOVAL (1 && ENABLE_2_5_0_ALPHA1)
 // Enable removal of old OpenGL render calls
 #define ENABLE_GLBEGIN_GLEND_REMOVAL (1 && ENABLE_2_5_0_ALPHA1)
+// Enable replace GLIndexedVertexArray with GLModel
+#define ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL (1 && ENABLE_GLBEGIN_GLEND_REMOVAL)
 // Enable show non-manifold edges
 #define ENABLE_SHOW_NON_MANIFOLD_EDGES (1 && ENABLE_2_5_0_ALPHA1)
+// Enable rework of Reload from disk command
+#define ENABLE_RELOAD_FROM_DISK_REWORK (1 && ENABLE_2_5_0_ALPHA1)
+// Enable showing toolpaths center of gravity
+#define ENABLE_SHOW_TOOLPATHS_COG (1 && ENABLE_2_5_0_ALPHA1)
+// Enable recalculating toolpaths when switching to/from volumetric rate visualization
+#define ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC (1 && ENABLE_2_5_0_ALPHA1)
 
 
 //====================
diff --git a/src/qoi/CMakeLists.txt b/src/qoi/CMakeLists.txt
new file mode 100644
index 000000000..af8bf2e05
--- /dev/null
+++ b/src/qoi/CMakeLists.txt
@@ -0,0 +1,9 @@
+# PrusaSlicer specific CMake
+
+cmake_minimum_required(VERSION 2.8.12)
+project(qoi)
+
+add_library(qoi STATIC
+    qoi.h
+    qoilib.c
+)
diff --git a/src/qoi/README.md b/src/qoi/README.md
new file mode 100644
index 000000000..4006c3850
--- /dev/null
+++ b/src/qoi/README.md
@@ -0,0 +1,108 @@
+Bundled with PrusaSlicer: commit 6c0831f91ffde5dfe2ceef32cbaff91d62b0e0ee
+Original README follows:
+
+
+![QOI Logo](https://qoiformat.org/qoi-logo.svg)
+
+# QOI - The “Quite OK Image Format” for fast, lossless image compression
+
+Single-file MIT licensed library for C/C++
+
+See [qoi.h](https://github.com/phoboslab/qoi/blob/master/qoi.h) for
+the documentation and format specification.
+
+More info at https://qoiformat.org
+
+
+## Why?
+
+Compared to stb_image and stb_image_write QOI offers 20x-50x faster encoding,
+3x-4x faster decoding and 20% better compression. It's also stupidly simple and
+fits in about 300 lines of C.
+
+
+## Example Usage
+
+- [qoiconv.c](https://github.com/phoboslab/qoi/blob/master/qoiconv.c)
+converts between png <> qoi
+ - [qoibench.c](https://github.com/phoboslab/qoi/blob/master/qoibench.c)
+a simple wrapper to benchmark stbi, libpng and qoi
+
+
+## Limitations
+
+The QOI file format allows for huge images with up to 18 exa-pixels. A streaming 
+en-/decoder can handle these with minimal RAM requirements, assuming there is 
+enough storage space.
+
+This particular implementation of QOI however is limited to images with a 
+maximum size of 400 million pixels. It will safely refuse to en-/decode anything
+larger than that. This is not a streaming en-/decoder. It loads the whole image
+file into RAM before doing any work and is not extensively optimized for 
+performance (but it's still very fast).
+
+If this is a limitation for your use case, please look into any of the other 
+implementations listed below.
+
+
+## Tools
+
+- https://github.com/floooh/qoiview - native QOI viewer
+- https://github.com/pfusik/qoi-ci/releases/tag/qoi-ci-1.1.0 - QOI Plugin installer for GIMP, Imagine, Paint.NET and XnView MP
+- https://github.com/iOrange/QoiFileTypeNet/releases/tag/v0.2 - QOI Plugin for Paint.NET
+- https://github.com/iOrange/QOIThumbnailProvider - Add thumbnails for QOI images in Windows Explorer
+- https://github.com/Tom94/tev - another native QOI viewer (allows pixel peeping and comparison with other image formats)
+- https://apps.apple.com/br/app/qoiconverterx/id1602159820 QOI <=> PNG converter available on the Mac App Store
+- https://github.com/kaetemi/qoi-max - QOI Bitmap I/O Plugin for 3ds Max
+- https://raylibtech.itch.io/rtexviewer - texture viewer, supports QOI
+
+
+## Implementations & Bindings of QOI
+
+- https://github.com/pfusik/qoi-ci (Ć, transpiled to C, C++, C#, Java, JavaScript, Python and Swift)
+- https://github.com/kodonnell/qoi (Python)
+- https://github.com/Cr4xy/lua-qoi (Lua)
+- https://github.com/superzazu/SDL_QOI (C, SDL2 bindings)
+- https://github.com/saharNooby/qoi-java (Java)
+- https://github.com/MasterQ32/zig-qoi (Zig)
+- https://github.com/rbino/qoix (Elixir)
+- https://github.com/NUlliiON/QoiSharp (C#)
+- https://github.com/aldanor/qoi-rust (Rust)
+- https://github.com/zakarumych/rapid-qoi (Rust)
+- https://github.com/takeyourhatoff/qoi (Go)
+- https://github.com/DosWorld/pasqoi (Pascal)
+- https://github.com/elihwyma/Swift-QOI (Swift)
+- https://github.com/xfmoulet/qoi (Go)
+- https://erratique.ch/software/qoic (OCaml)
+- https://github.com/arian/go-qoi (Go)
+- https://github.com/kchapelier/qoijs (JavaScript)
+- https://github.com/KristofferC/QOI.jl (Julia)
+- https://github.com/shadowMitia/libqoi/ (C++)
+- https://github.com/MKCG/php-qoi (PHP)
+- https://github.com/LightHouseSoftware/qoiformats (D)
+- https://github.com/mhoward540/qoi-nim (Nim)
+
+
+## QOI Support in Other Software
+
+- [SerenityOS](https://github.com/SerenityOS/serenity) supports decoding QOI system wide through a custom [cpp implementation in LibGfx](https://github.com/SerenityOS/serenity/blob/master/Userland/Libraries/LibGfx/QOILoader.h)
+- [Raylib](https://github.com/raysan5/raylib) supports decoding and encoding QOI textures through its [rtextures module](https://github.com/raysan5/raylib/blob/master/src/rtextures.c)
+- [Rebol3](https://github.com/Oldes/Rebol3/issues/39) supports decoding and encoding QOI using a native codec
+- [c-ray](https://github.com/vkoskiv/c-ray) supports QOI natively
+- [SAIL](https://github.com/HappySeaFox/sail) image decoding library, supports decoding and encoding QOI images
+- [Orx](https://github.com/orx/orx) 2D game engine, supports QOI natively
+
+
+## Packages
+
+[AUR](https://aur.archlinux.org/pkgbase/qoi-git/) - system-wide qoi.h, qoiconv and qoibench install as split packages.
+
+
+## Implementations not yet conforming to the final specification
+
+These implementations are based on the pre-release version of QOI. Resulting files are not compatible with the current version.
+
+- https://github.com/ChevyRay/qoi_rs (Rust)
+- https://github.com/panzi/jsqoi (TypeScript)
+- https://github.com/0xd34df00d/hsqoi (Haskell)
+
diff --git a/src/qoi/qoi.h b/src/qoi/qoi.h
new file mode 100644
index 000000000..988f9edcb
--- /dev/null
+++ b/src/qoi/qoi.h
@@ -0,0 +1,671 @@
+/*
+
+QOI - The "Quite OK Image" format for fast, lossless image compression
+
+Dominic Szablewski - https://phoboslab.org
+
+
+-- LICENSE: The MIT License(MIT)
+
+Copyright(c) 2021 Dominic Szablewski
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files(the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and / or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions :
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+
+-- About
+
+QOI encodes and decodes images in a lossless format. Compared to stb_image and
+stb_image_write QOI offers 20x-50x faster encoding, 3x-4x faster decoding and
+20% better compression.
+
+
+-- Synopsis
+
+// Define `QOI_IMPLEMENTATION` in *one* C/C++ file before including this
+// library to create the implementation.
+
+#define QOI_IMPLEMENTATION
+#include "qoi.h"
+
+// Encode and store an RGBA buffer to the file system. The qoi_desc describes
+// the input pixel data.
+qoi_write("image_new.qoi", rgba_pixels, &(qoi_desc){
+	.width = 1920,
+	.height = 1080,
+	.channels = 4,
+	.colorspace = QOI_SRGB
+});
+
+// Load and decode a QOI image from the file system into a 32bbp RGBA buffer.
+// The qoi_desc struct will be filled with the width, height, number of channels
+// and colorspace read from the file header.
+qoi_desc desc;
+void *rgba_pixels = qoi_read("image.qoi", &desc, 4);
+
+
+
+-- Documentation
+
+This library provides the following functions;
+- qoi_read    -- read and decode a QOI file
+- qoi_decode  -- decode the raw bytes of a QOI image from memory
+- qoi_write   -- encode and write a QOI file
+- qoi_encode  -- encode an rgba buffer into a QOI image in memory
+
+See the function declaration below for the signature and more information.
+
+If you don't want/need the qoi_read and qoi_write functions, you can define
+QOI_NO_STDIO before including this library.
+
+This library uses malloc() and free(). To supply your own malloc implementation
+you can define QOI_MALLOC and QOI_FREE before including this library.
+
+This library uses memset() to zero-initialize the index. To supply your own
+implementation you can define QOI_ZEROARR before including this library.
+
+
+-- Data Format
+
+A QOI file has a 14 byte header, followed by any number of data "chunks" and an
+8-byte end marker.
+
+struct qoi_header_t {
+	char     magic[4];   // magic bytes "qoif"
+	uint32_t width;      // image width in pixels (BE)
+	uint32_t height;     // image height in pixels (BE)
+	uint8_t  channels;   // 3 = RGB, 4 = RGBA
+	uint8_t  colorspace; // 0 = sRGB with linear alpha, 1 = all channels linear
+};
+
+Images are encoded row by row, left to right, top to bottom. The decoder and
+encoder start with {r: 0, g: 0, b: 0, a: 255} as the previous pixel value. An
+image is complete when all pixels specified by width * height have been covered.
+
+Pixels are encoded as
+ - a run of the previous pixel
+ - an index into an array of previously seen pixels
+ - a difference to the previous pixel value in r,g,b
+ - full r,g,b or r,g,b,a values
+
+The color channels are assumed to not be premultiplied with the alpha channel
+("un-premultiplied alpha").
+
+A running array[64] (zero-initialized) of previously seen pixel values is
+maintained by the encoder and decoder. Each pixel that is seen by the encoder
+and decoder is put into this array at the position formed by a hash function of
+the color value. In the encoder, if the pixel value at the index matches the
+current pixel, this index position is written to the stream as QOI_OP_INDEX.
+The hash function for the index is:
+
+	index_position = (r * 3 + g * 5 + b * 7 + a * 11) % 64
+
+Each chunk starts with a 2- or 8-bit tag, followed by a number of data bits. The
+bit length of chunks is divisible by 8 - i.e. all chunks are byte aligned. All
+values encoded in these data bits have the most significant bit on the left.
+
+The 8-bit tags have precedence over the 2-bit tags. A decoder must check for the
+presence of an 8-bit tag first.
+
+The byte stream's end is marked with 7 0x00 bytes followed a single 0x01 byte.
+
+
+The possible chunks are:
+
+
+.- QOI_OP_INDEX ----------.
+|         Byte[0]         |
+|  7  6  5  4  3  2  1  0 |
+|-------+-----------------|
+|  0  0 |     index       |
+`-------------------------`
+2-bit tag b00
+6-bit index into the color index array: 0..63
+
+A valid encoder must not issue 2 or more consecutive QOI_OP_INDEX chunks to the
+same index. QOI_OP_RUN should be used instead.
+
+
+.- QOI_OP_DIFF -----------.
+|         Byte[0]         |
+|  7  6  5  4  3  2  1  0 |
+|-------+-----+-----+-----|
+|  0  1 |  dr |  dg |  db |
+`-------------------------`
+2-bit tag b01
+2-bit   red channel difference from the previous pixel between -2..1
+2-bit green channel difference from the previous pixel between -2..1
+2-bit  blue channel difference from the previous pixel between -2..1
+
+The difference to the current channel values are using a wraparound operation,
+so "1 - 2" will result in 255, while "255 + 1" will result in 0.
+
+Values are stored as unsigned integers with a bias of 2. E.g. -2 is stored as
+0 (b00). 1 is stored as 3 (b11).
+
+The alpha value remains unchanged from the previous pixel.
+
+
+.- QOI_OP_LUMA -------------------------------------.
+|         Byte[0]         |         Byte[1]         |
+|  7  6  5  4  3  2  1  0 |  7  6  5  4  3  2  1  0 |
+|-------+-----------------+-------------+-----------|
+|  1  0 |  green diff     |   dr - dg   |  db - dg  |
+`---------------------------------------------------`
+2-bit tag b10
+6-bit green channel difference from the previous pixel -32..31
+4-bit   red channel difference minus green channel difference -8..7
+4-bit  blue channel difference minus green channel difference -8..7
+
+The green channel is used to indicate the general direction of change and is
+encoded in 6 bits. The red and blue channels (dr and db) base their diffs off
+of the green channel difference and are encoded in 4 bits. I.e.:
+	dr_dg = (cur_px.r - prev_px.r) - (cur_px.g - prev_px.g)
+	db_dg = (cur_px.b - prev_px.b) - (cur_px.g - prev_px.g)
+
+The difference to the current channel values are using a wraparound operation,
+so "10 - 13" will result in 253, while "250 + 7" will result in 1.
+
+Values are stored as unsigned integers with a bias of 32 for the green channel
+and a bias of 8 for the red and blue channel.
+
+The alpha value remains unchanged from the previous pixel.
+
+
+.- QOI_OP_RUN ------------.
+|         Byte[0]         |
+|  7  6  5  4  3  2  1  0 |
+|-------+-----------------|
+|  1  1 |       run       |
+`-------------------------`
+2-bit tag b11
+6-bit run-length repeating the previous pixel: 1..62
+
+The run-length is stored with a bias of -1. Note that the run-lengths 63 and 64
+(b111110 and b111111) are illegal as they are occupied by the QOI_OP_RGB and
+QOI_OP_RGBA tags.
+
+
+.- QOI_OP_RGB ------------------------------------------.
+|         Byte[0]         | Byte[1] | Byte[2] | Byte[3] |
+|  7  6  5  4  3  2  1  0 | 7 .. 0  | 7 .. 0  | 7 .. 0  |
+|-------------------------+---------+---------+---------|
+|  1  1  1  1  1  1  1  0 |   red   |  green  |  blue   |
+`-------------------------------------------------------`
+8-bit tag b11111110
+8-bit   red channel value
+8-bit green channel value
+8-bit  blue channel value
+
+The alpha value remains unchanged from the previous pixel.
+
+
+.- QOI_OP_RGBA ---------------------------------------------------.
+|         Byte[0]         | Byte[1] | Byte[2] | Byte[3] | Byte[4] |
+|  7  6  5  4  3  2  1  0 | 7 .. 0  | 7 .. 0  | 7 .. 0  | 7 .. 0  |
+|-------------------------+---------+---------+---------+---------|
+|  1  1  1  1  1  1  1  1 |   red   |  green  |  blue   |  alpha  |
+`-----------------------------------------------------------------`
+8-bit tag b11111111
+8-bit   red channel value
+8-bit green channel value
+8-bit  blue channel value
+8-bit alpha channel value
+
+*/
+
+
+/* -----------------------------------------------------------------------------
+Header - Public functions */
+
+#ifndef QOI_H
+#define QOI_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* A pointer to a qoi_desc struct has to be supplied to all of qoi's functions.
+It describes either the input format (for qoi_write and qoi_encode), or is
+filled with the description read from the file header (for qoi_read and
+qoi_decode).
+
+The colorspace in this qoi_desc is an enum where
+	0 = sRGB, i.e. gamma scaled RGB channels and a linear alpha channel
+	1 = all channels are linear
+You may use the constants QOI_SRGB or QOI_LINEAR. The colorspace is purely
+informative. It will be saved to the file header, but does not affect
+how chunks are en-/decoded. */
+
+#define QOI_SRGB   0
+#define QOI_LINEAR 1
+
+typedef struct {
+	unsigned int width;
+	unsigned int height;
+	unsigned char channels;
+	unsigned char colorspace;
+} qoi_desc;
+
+#ifndef QOI_NO_STDIO
+
+/* Encode raw RGB or RGBA pixels into a QOI image and write it to the file
+system. The qoi_desc struct must be filled with the image width, height,
+number of channels (3 = RGB, 4 = RGBA) and the colorspace.
+
+The function returns 0 on failure (invalid parameters, or fopen or malloc
+failed) or the number of bytes written on success. */
+
+int qoi_write(const char *filename, const void *data, const qoi_desc *desc);
+
+
+/* Read and decode a QOI image from the file system. If channels is 0, the
+number of channels from the file header is used. If channels is 3 or 4 the
+output format will be forced into this number of channels.
+
+The function either returns NULL on failure (invalid data, or malloc or fopen
+failed) or a pointer to the decoded pixels. On success, the qoi_desc struct
+will be filled with the description from the file header.
+
+The returned pixel data should be free()d after use. */
+
+void *qoi_read(const char *filename, qoi_desc *desc, int channels);
+
+#endif /* QOI_NO_STDIO */
+
+
+/* Encode raw RGB or RGBA pixels into a QOI image in memory.
+
+The function either returns NULL on failure (invalid parameters or malloc
+failed) or a pointer to the encoded data on success. On success the out_len
+is set to the size in bytes of the encoded data.
+
+The returned qoi data should be free()d after use. */
+
+void *qoi_encode(const void *data, const qoi_desc *desc, int *out_len);
+
+
+/* Decode a QOI image from memory.
+
+The function either returns NULL on failure (invalid parameters or malloc
+failed) or a pointer to the decoded pixels. On success, the qoi_desc struct
+is filled with the description from the file header.
+
+The returned pixel data should be free()d after use. */
+
+void *qoi_decode(const void *data, int size, qoi_desc *desc, int channels);
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* QOI_H */
+
+
+/* -----------------------------------------------------------------------------
+Implementation */
+
+#ifdef QOI_IMPLEMENTATION
+#include <stdlib.h>
+#include <string.h>
+
+#ifndef QOI_MALLOC
+	#define QOI_MALLOC(sz) malloc(sz)
+	#define QOI_FREE(p)    free(p)
+#endif
+#ifndef QOI_ZEROARR
+	#define QOI_ZEROARR(a) memset((a),0,sizeof(a))
+#endif
+
+#define QOI_OP_INDEX  0x00 /* 00xxxxxx */
+#define QOI_OP_DIFF   0x40 /* 01xxxxxx */
+#define QOI_OP_LUMA   0x80 /* 10xxxxxx */
+#define QOI_OP_RUN    0xc0 /* 11xxxxxx */
+#define QOI_OP_RGB    0xfe /* 11111110 */
+#define QOI_OP_RGBA   0xff /* 11111111 */
+
+#define QOI_MASK_2    0xc0 /* 11000000 */
+
+#define QOI_COLOR_HASH(C) (C.rgba.r*3 + C.rgba.g*5 + C.rgba.b*7 + C.rgba.a*11)
+#define QOI_MAGIC \
+	(((unsigned int)'q') << 24 | ((unsigned int)'o') << 16 | \
+	 ((unsigned int)'i') <<  8 | ((unsigned int)'f'))
+#define QOI_HEADER_SIZE 14
+
+/* 2GB is the max file size that this implementation can safely handle. We guard
+against anything larger than that, assuming the worst case with 5 bytes per
+pixel, rounded down to a nice clean value. 400 million pixels ought to be
+enough for anybody. */
+#define QOI_PIXELS_MAX ((unsigned int)400000000)
+
+typedef union {
+	struct { unsigned char r, g, b, a; } rgba;
+	unsigned int v;
+} qoi_rgba_t;
+
+static const unsigned char qoi_padding[8] = {0,0,0,0,0,0,0,1};
+
+static void qoi_write_32(unsigned char *bytes, int *p, unsigned int v) {
+	bytes[(*p)++] = (0xff000000 & v) >> 24;
+	bytes[(*p)++] = (0x00ff0000 & v) >> 16;
+	bytes[(*p)++] = (0x0000ff00 & v) >> 8;
+	bytes[(*p)++] = (0x000000ff & v);
+}
+
+static unsigned int qoi_read_32(const unsigned char *bytes, int *p) {
+	unsigned int a = bytes[(*p)++];
+	unsigned int b = bytes[(*p)++];
+	unsigned int c = bytes[(*p)++];
+	unsigned int d = bytes[(*p)++];
+	return a << 24 | b << 16 | c << 8 | d;
+}
+
+void *qoi_encode(const void *data, const qoi_desc *desc, int *out_len) {
+	int i, max_size, p, run;
+	int px_len, px_end, px_pos, channels;
+	unsigned char *bytes;
+	const unsigned char *pixels;
+	qoi_rgba_t index[64];
+	qoi_rgba_t px, px_prev;
+
+	if (
+		data == NULL || out_len == NULL || desc == NULL ||
+		desc->width == 0 || desc->height == 0 ||
+		desc->channels < 3 || desc->channels > 4 ||
+		desc->colorspace > 1 ||
+		desc->height >= QOI_PIXELS_MAX / desc->width
+	) {
+		return NULL;
+	}
+
+	max_size =
+		desc->width * desc->height * (desc->channels + 1) +
+		QOI_HEADER_SIZE + sizeof(qoi_padding);
+
+	p = 0;
+	bytes = (unsigned char *) QOI_MALLOC(max_size);
+	if (!bytes) {
+		return NULL;
+	}
+
+	qoi_write_32(bytes, &p, QOI_MAGIC);
+	qoi_write_32(bytes, &p, desc->width);
+	qoi_write_32(bytes, &p, desc->height);
+	bytes[p++] = desc->channels;
+	bytes[p++] = desc->colorspace;
+
+
+	pixels = (const unsigned char *)data;
+
+	QOI_ZEROARR(index);
+
+	run = 0;
+	px_prev.rgba.r = 0;
+	px_prev.rgba.g = 0;
+	px_prev.rgba.b = 0;
+	px_prev.rgba.a = 255;
+	px = px_prev;
+
+	px_len = desc->width * desc->height * desc->channels;
+	px_end = px_len - desc->channels;
+	channels = desc->channels;
+
+	for (px_pos = 0; px_pos < px_len; px_pos += channels) {
+		if (channels == 4) {
+			px = *(qoi_rgba_t *)(pixels + px_pos);
+		}
+		else {
+			px.rgba.r = pixels[px_pos + 0];
+			px.rgba.g = pixels[px_pos + 1];
+			px.rgba.b = pixels[px_pos + 2];
+		}
+
+		if (px.v == px_prev.v) {
+			run++;
+			if (run == 62 || px_pos == px_end) {
+				bytes[p++] = QOI_OP_RUN | (run - 1);
+				run = 0;
+			}
+		}
+		else {
+			int index_pos;
+
+			if (run > 0) {
+				bytes[p++] = QOI_OP_RUN | (run - 1);
+				run = 0;
+			}
+
+			index_pos = QOI_COLOR_HASH(px) % 64;
+
+			if (index[index_pos].v == px.v) {
+				bytes[p++] = QOI_OP_INDEX | index_pos;
+			}
+			else {
+				index[index_pos] = px;
+
+				if (px.rgba.a == px_prev.rgba.a) {
+					signed char vr = px.rgba.r - px_prev.rgba.r;
+					signed char vg = px.rgba.g - px_prev.rgba.g;
+					signed char vb = px.rgba.b - px_prev.rgba.b;
+
+					signed char vg_r = vr - vg;
+					signed char vg_b = vb - vg;
+
+					if (
+						vr > -3 && vr < 2 &&
+						vg > -3 && vg < 2 &&
+						vb > -3 && vb < 2
+					) {
+						bytes[p++] = QOI_OP_DIFF | (vr + 2) << 4 | (vg + 2) << 2 | (vb + 2);
+					}
+					else if (
+						vg_r >  -9 && vg_r <  8 &&
+						vg   > -33 && vg   < 32 &&
+						vg_b >  -9 && vg_b <  8
+					) {
+						bytes[p++] = QOI_OP_LUMA     | (vg   + 32);
+						bytes[p++] = (vg_r + 8) << 4 | (vg_b +  8);
+					}
+					else {
+						bytes[p++] = QOI_OP_RGB;
+						bytes[p++] = px.rgba.r;
+						bytes[p++] = px.rgba.g;
+						bytes[p++] = px.rgba.b;
+					}
+				}
+				else {
+					bytes[p++] = QOI_OP_RGBA;
+					bytes[p++] = px.rgba.r;
+					bytes[p++] = px.rgba.g;
+					bytes[p++] = px.rgba.b;
+					bytes[p++] = px.rgba.a;
+				}
+			}
+		}
+		px_prev = px;
+	}
+
+	for (i = 0; i < (int)sizeof(qoi_padding); i++) {
+		bytes[p++] = qoi_padding[i];
+	}
+
+	*out_len = p;
+	return bytes;
+}
+
+void *qoi_decode(const void *data, int size, qoi_desc *desc, int channels) {
+	const unsigned char *bytes;
+	unsigned int header_magic;
+	unsigned char *pixels;
+	qoi_rgba_t index[64];
+	qoi_rgba_t px;
+	int px_len, chunks_len, px_pos;
+	int p = 0, run = 0;
+
+	if (
+		data == NULL || desc == NULL ||
+		(channels != 0 && channels != 3 && channels != 4) ||
+		size < QOI_HEADER_SIZE + (int)sizeof(qoi_padding)
+	) {
+		return NULL;
+	}
+
+	bytes = (const unsigned char *)data;
+
+	header_magic = qoi_read_32(bytes, &p);
+	desc->width = qoi_read_32(bytes, &p);
+	desc->height = qoi_read_32(bytes, &p);
+	desc->channels = bytes[p++];
+	desc->colorspace = bytes[p++];
+
+	if (
+		desc->width == 0 || desc->height == 0 ||
+		desc->channels < 3 || desc->channels > 4 ||
+		desc->colorspace > 1 ||
+		header_magic != QOI_MAGIC ||
+		desc->height >= QOI_PIXELS_MAX / desc->width
+	) {
+		return NULL;
+	}
+
+	if (channels == 0) {
+		channels = desc->channels;
+	}
+
+	px_len = desc->width * desc->height * channels;
+	pixels = (unsigned char *) QOI_MALLOC(px_len);
+	if (!pixels) {
+		return NULL;
+	}
+
+	QOI_ZEROARR(index);
+	px.rgba.r = 0;
+	px.rgba.g = 0;
+	px.rgba.b = 0;
+	px.rgba.a = 255;
+
+	chunks_len = size - (int)sizeof(qoi_padding);
+	for (px_pos = 0; px_pos < px_len; px_pos += channels) {
+		if (run > 0) {
+			run--;
+		}
+		else if (p < chunks_len) {
+			int b1 = bytes[p++];
+
+			if (b1 == QOI_OP_RGB) {
+				px.rgba.r = bytes[p++];
+				px.rgba.g = bytes[p++];
+				px.rgba.b = bytes[p++];
+			}
+			else if (b1 == QOI_OP_RGBA) {
+				px.rgba.r = bytes[p++];
+				px.rgba.g = bytes[p++];
+				px.rgba.b = bytes[p++];
+				px.rgba.a = bytes[p++];
+			}
+			else if ((b1 & QOI_MASK_2) == QOI_OP_INDEX) {
+				px = index[b1];
+			}
+			else if ((b1 & QOI_MASK_2) == QOI_OP_DIFF) {
+				px.rgba.r += ((b1 >> 4) & 0x03) - 2;
+				px.rgba.g += ((b1 >> 2) & 0x03) - 2;
+				px.rgba.b += ( b1       & 0x03) - 2;
+			}
+			else if ((b1 & QOI_MASK_2) == QOI_OP_LUMA) {
+				int b2 = bytes[p++];
+				int vg = (b1 & 0x3f) - 32;
+				px.rgba.r += vg - 8 + ((b2 >> 4) & 0x0f);
+				px.rgba.g += vg;
+				px.rgba.b += vg - 8 +  (b2       & 0x0f);
+			}
+			else if ((b1 & QOI_MASK_2) == QOI_OP_RUN) {
+				run = (b1 & 0x3f);
+			}
+
+			index[QOI_COLOR_HASH(px) % 64] = px;
+		}
+
+		if (channels == 4) {
+			*(qoi_rgba_t*)(pixels + px_pos) = px;
+		}
+		else {
+			pixels[px_pos + 0] = px.rgba.r;
+			pixels[px_pos + 1] = px.rgba.g;
+			pixels[px_pos + 2] = px.rgba.b;
+		}
+	}
+
+	return pixels;
+}
+
+#ifndef QOI_NO_STDIO
+#include <stdio.h>
+
+int qoi_write(const char *filename, const void *data, const qoi_desc *desc) {
+	FILE *f = fopen(filename, "wb");
+	int size;
+	void *encoded;
+
+	if (!f) {
+		return 0;
+	}
+
+	encoded = qoi_encode(data, desc, &size);
+	if (!encoded) {
+		fclose(f);
+		return 0;
+	}
+
+	fwrite(encoded, 1, size, f);
+	fclose(f);
+
+	QOI_FREE(encoded);
+	return size;
+}
+
+void *qoi_read(const char *filename, qoi_desc *desc, int channels) {
+	FILE *f = fopen(filename, "rb");
+	int size, bytes_read;
+	void *pixels, *data;
+
+	if (!f) {
+		return NULL;
+	}
+
+	fseek(f, 0, SEEK_END);
+	size = ftell(f);
+	if (size <= 0) {
+		fclose(f);
+		return NULL;
+	}
+	fseek(f, 0, SEEK_SET);
+
+	data = QOI_MALLOC(size);
+	if (!data) {
+		fclose(f);
+		return NULL;
+	}
+
+	bytes_read = fread(data, 1, size, f);
+	fclose(f);
+
+	pixels = qoi_decode(data, bytes_read, desc, channels);
+	QOI_FREE(data);
+	return pixels;
+}
+
+#endif /* QOI_NO_STDIO */
+#endif /* QOI_IMPLEMENTATION */
diff --git a/src/qoi/qoilib.c b/src/qoi/qoilib.c
new file mode 100644
index 000000000..e3aa809c7
--- /dev/null
+++ b/src/qoi/qoilib.c
@@ -0,0 +1,6 @@
+// PrusaSlicer specific: 
+// Include and compile QOI library.
+
+#define QOI_IMPLEMENTATION
+#define QOI_NO_STDIO
+#include "qoi.h"
diff --git a/src/slic3r/GUI/3DBed.cpp b/src/slic3r/GUI/3DBed.cpp
index c4f1a4407..8488c1148 100644
--- a/src/slic3r/GUI/3DBed.cpp
+++ b/src/slic3r/GUI/3DBed.cpp
@@ -27,6 +27,7 @@ static const Slic3r::ColorRGBA DEFAULT_TRANSPARENT_GRID_COLOR  = { 0.9f, 0.9f, 0
 namespace Slic3r {
 namespace GUI {
 
+#if !ENABLE_GLBEGIN_GLEND_REMOVAL
 bool GeometryBuffer::set_from_triangles(const std::vector<Vec2f> &triangles, float z)
 {
     if (triangles.empty()) {
@@ -95,6 +96,7 @@ const float* GeometryBuffer::get_vertices_data() const
 {
     return (m_vertices.size() > 0) ? (const float*)m_vertices.data() : nullptr;
 }
+#endif // !ENABLE_GLBEGIN_GLEND_REMOVAL
 
 const float Bed3D::Axes::DefaultStemRadius = 0.5f;
 const float Bed3D::Axes::DefaultStemLength = 25.0f;
@@ -198,6 +200,13 @@ bool Bed3D::set_shape(const Pointfs& bed_shape, const double max_print_height, c
     m_model_filename = model_filename;
     m_extended_bounding_box = this->calc_extended_bounding_box();
 
+#if ENABLE_GLBEGIN_GLEND_REMOVAL
+    m_contour = ExPolygon(Polygon::new_scale(bed_shape));
+    m_polygon = offset(m_contour.contour, (float)m_contour.contour.bounding_box().radius() * 1.7f, jtRound, scale_(0.5)).front();
+
+    m_triangles.reset();
+    m_gridlines.reset();
+#else
     ExPolygon poly{ Polygon::new_scale(bed_shape) };
 
     calc_triangles(poly);
@@ -205,9 +214,10 @@ bool Bed3D::set_shape(const Pointfs& bed_shape, const double max_print_height, c
     const BoundingBox& bed_bbox = poly.contour.bounding_box();
     calc_gridlines(poly, bed_bbox);
 
-    m_polygon = offset(poly.contour, (float)bed_bbox.radius() * 1.7f, jtRound, scale_(0.5))[0];
+    m_polygon = offset(poly.contour, (float)bed_bbox.radius() * 1.7f, jtRound, scale_(0.5)).front();
 
     this->release_VBOs();
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
     m_texture.reset();
     m_model.reset();
 
@@ -288,6 +298,107 @@ BoundingBoxf3 Bed3D::calc_extended_bounding_box() const
     return out;
 }
 
+#if ENABLE_GLBEGIN_GLEND_REMOVAL
+void Bed3D::init_triangles()
+{
+    if (m_triangles.is_initialized())
+        return;
+
+    if (m_contour.empty())
+        return;
+
+    const std::vector<Vec2f> triangles = triangulate_expolygon_2f(m_contour, NORMALS_UP);
+    if (triangles.empty() || triangles.size() % 3 != 0)
+        return;
+
+    GLModel::Geometry init_data;
+    const GLModel::Geometry::EIndexType index_type = (triangles.size() < 65536) ? GLModel::Geometry::EIndexType::USHORT : GLModel::Geometry::EIndexType::UINT;
+    init_data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3T2, index_type };
+    init_data.reserve_vertices(triangles.size());
+    init_data.reserve_indices(triangles.size() / 3);
+
+    Vec2f min = triangles.front();
+    Vec2f max = min;
+    for (const Vec2f& v : triangles) {
+        min = min.cwiseMin(v).eval();
+        max = max.cwiseMax(v).eval();
+    }
+
+    const Vec2f size = max - min;
+    if (size.x() <= 0.0f || size.y() <= 0.0f)
+        return;
+
+    Vec2f inv_size = size.cwiseInverse();
+    inv_size.y() *= -1.0f;
+
+    // vertices + indices
+    unsigned int vertices_counter = 0;
+    for (const Vec2f& v : triangles) {
+        const Vec3f p = { v.x(), v.y(), GROUND_Z };
+        init_data.add_vertex(p, (Vec2f)v.cwiseProduct(inv_size).eval());
+        ++vertices_counter;
+        if (vertices_counter % 3 == 0) {
+            if (index_type == GLModel::Geometry::EIndexType::USHORT)
+                init_data.add_ushort_triangle((unsigned short)vertices_counter - 3, (unsigned short)vertices_counter - 2, (unsigned short)vertices_counter - 1);
+            else
+                init_data.add_uint_triangle(vertices_counter - 3, vertices_counter - 2, vertices_counter - 1);
+        }
+    }
+
+    m_triangles.init_from(std::move(init_data));
+}
+
+void Bed3D::init_gridlines()
+{
+    if (m_gridlines.is_initialized())
+        return;
+
+    if (m_contour.empty())
+        return;
+
+    const BoundingBox& bed_bbox = m_contour.contour.bounding_box();
+    const coord_t step = scale_(10.0);
+
+    Polylines axes_lines;
+    for (coord_t x = bed_bbox.min.x(); x <= bed_bbox.max.x(); x += step) {
+        Polyline line;
+        line.append(Point(x, bed_bbox.min.y()));
+        line.append(Point(x, bed_bbox.max.y()));
+        axes_lines.push_back(line);
+    }
+    for (coord_t y = bed_bbox.min.y(); y <= bed_bbox.max.y(); y += step) {
+        Polyline line;
+        line.append(Point(bed_bbox.min.x(), y));
+        line.append(Point(bed_bbox.max.x(), y));
+        axes_lines.push_back(line);
+    }
+
+    // clip with a slightly grown expolygon because our lines lay on the contours and may get erroneously clipped
+    Lines gridlines = to_lines(intersection_pl(axes_lines, offset(m_contour, float(SCALED_EPSILON))));
+
+    // append bed contours
+    Lines contour_lines = to_lines(m_contour);
+    std::copy(contour_lines.begin(), contour_lines.end(), std::back_inserter(gridlines));
+
+    GLModel::Geometry init_data;
+    const GLModel::Geometry::EIndexType index_type = (2 * gridlines.size() < 65536) ? GLModel::Geometry::EIndexType::USHORT : GLModel::Geometry::EIndexType::UINT;
+    init_data.format = { GLModel::Geometry::EPrimitiveType::Lines, GLModel::Geometry::EVertexLayout::P3, index_type };
+    init_data.reserve_vertices(2 * gridlines.size());
+    init_data.reserve_indices(2 * gridlines.size());
+
+    for (const Line& l : gridlines) {
+        init_data.add_vertex(Vec3f(unscale<float>(l.a.x()), unscale<float>(l.a.y()), GROUND_Z));
+        init_data.add_vertex(Vec3f(unscale<float>(l.b.x()), unscale<float>(l.b.y()), GROUND_Z));
+        const unsigned int vertices_counter = (unsigned int)init_data.vertices_count();
+        if (index_type == GLModel::Geometry::EIndexType::USHORT)
+            init_data.add_ushort_line((unsigned short)vertices_counter - 2, (unsigned short)vertices_counter - 1);
+        else
+            init_data.add_uint_line(vertices_counter - 2, vertices_counter - 1);
+    }
+
+    m_gridlines.init_from(std::move(init_data));
+}
+#else
 void Bed3D::calc_triangles(const ExPolygon& poly)
 {
     if (! m_triangles.set_from_triangles(triangulate_expolygon_2f(poly, NORMALS_UP), GROUND_Z))
@@ -320,6 +431,7 @@ void Bed3D::calc_gridlines(const ExPolygon& poly, const BoundingBox& bed_bbox)
     if (!m_gridlines.set_from_lines(gridlines, GROUND_Z))
         BOOST_LOG_TRIVIAL(error) << "Unable to create bed grid lines\n";
 }
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
 
 // Try to match the print bed shape with the shape of an active profile. If such a match exists,
 // return the print bed model.
@@ -421,6 +533,44 @@ void Bed3D::render_texture(bool bottom, GLCanvas3D& canvas)
         canvas.request_extra_frame();
     }
 
+#if ENABLE_GLBEGIN_GLEND_REMOVAL
+    init_triangles();
+
+    GLShaderProgram* shader = wxGetApp().get_shader("printbed");
+    if (shader != nullptr) {
+        shader->start_using();
+        shader->set_uniform("transparent_background", bottom);
+        shader->set_uniform("svg_source", boost::algorithm::iends_with(m_texture.get_source(), ".svg"));
+
+        glsafe(::glEnable(GL_DEPTH_TEST));
+        if (bottom)
+            glsafe(::glDepthMask(GL_FALSE));
+
+        glsafe(::glEnable(GL_BLEND));
+        glsafe(::glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA));
+
+        if (bottom)
+            glsafe(::glFrontFace(GL_CW));
+
+        // show the temporary texture while no compressed data is available
+        GLuint tex_id = (GLuint)m_temp_texture.get_id();
+        if (tex_id == 0)
+            tex_id = (GLuint)m_texture.get_id();
+
+        glsafe(::glBindTexture(GL_TEXTURE_2D, tex_id));
+        m_triangles.render();
+        glsafe(::glBindTexture(GL_TEXTURE_2D, 0));
+
+        if (bottom)
+            glsafe(::glFrontFace(GL_CCW));
+
+        glsafe(::glDisable(GL_BLEND));
+        if (bottom)
+            glsafe(::glDepthMask(GL_TRUE));
+
+        shader->stop_using();
+    }
+#else
     if (m_triangles.get_vertices_count() > 0) {
         GLShaderProgram* shader = wxGetApp().get_shader("printbed");
         if (shader != nullptr) {
@@ -488,6 +638,7 @@ void Bed3D::render_texture(bool bottom, GLCanvas3D& canvas)
             shader->stop_using();
         }
     }
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
 }
 
 void Bed3D::render_model()
@@ -541,6 +692,40 @@ void Bed3D::render_default(bool bottom, bool picking)
 {
     m_texture.reset();
 
+#if ENABLE_GLBEGIN_GLEND_REMOVAL
+    init_gridlines();
+    init_triangles();
+
+    GLShaderProgram* shader = wxGetApp().get_shader("flat");
+    if (shader != nullptr) {
+        shader->start_using();
+
+        glsafe(::glEnable(GL_DEPTH_TEST));
+        glsafe(::glEnable(GL_BLEND));
+        glsafe(::glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA));
+
+        const bool has_model = !m_model.get_filename().empty();
+
+        if (!has_model && !bottom) {
+            // draw background
+            glsafe(::glDepthMask(GL_FALSE));
+            m_triangles.set_color(picking ? PICKING_MODEL_COLOR : DEFAULT_MODEL_COLOR);
+            m_triangles.render();
+            glsafe(::glDepthMask(GL_TRUE));
+        }
+
+        if (!picking) {
+            // draw grid
+            glsafe(::glLineWidth(1.5f * m_scale_factor));
+            m_gridlines.set_color(has_model && !bottom ? DEFAULT_SOLID_GRID_COLOR : DEFAULT_TRANSPARENT_GRID_COLOR);
+            m_gridlines.render();
+        }
+
+        glsafe(::glDisable(GL_BLEND));
+
+        shader->stop_using();
+    }
+#else
     const unsigned int triangles_vcount = m_triangles.get_vertices_count();
     if (triangles_vcount > 0) {
         const bool has_model = !m_model.get_filename().empty();
@@ -573,8 +758,10 @@ void Bed3D::render_default(bool bottom, bool picking)
 
         glsafe(::glDisable(GL_BLEND));
     }
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
 }
 
+#if !ENABLE_GLBEGIN_GLEND_REMOVAL
 void Bed3D::release_VBOs()
 {
     if (m_vbo_id > 0) {
@@ -582,6 +769,7 @@ void Bed3D::release_VBOs()
         m_vbo_id = 0;
     }
 }
+#endif // !ENABLE_GLBEGIN_GLEND_REMOVAL
 
 } // GUI
 } // Slic3r
diff --git a/src/slic3r/GUI/3DBed.hpp b/src/slic3r/GUI/3DBed.hpp
index 82c6b817b..350ae48f6 100644
--- a/src/slic3r/GUI/3DBed.hpp
+++ b/src/slic3r/GUI/3DBed.hpp
@@ -5,7 +5,10 @@
 #include "3DScene.hpp"
 #include "GLModel.hpp"
 
-#include <libslic3r/BuildVolume.hpp>
+#include "libslic3r/BuildVolume.hpp"
+#if ENABLE_GLBEGIN_GLEND_REMOVAL
+#include "libslic3r/ExPolygon.hpp"
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
 
 #include <tuple>
 #include <array>
@@ -15,6 +18,7 @@ namespace GUI {
 
 class GLCanvas3D;
 
+#if !ENABLE_GLBEGIN_GLEND_REMOVAL
 class GeometryBuffer
 {
     struct Vertex
@@ -36,6 +40,7 @@ public:
     size_t get_tex_coords_offset() const { return (size_t)(3 * sizeof(float)); }
     unsigned int get_vertices_count() const { return (unsigned int)m_vertices.size(); }
 };
+#endif // !ENABLE_GLBEGIN_GLEND_REMOVAL
 
 class Bed3D
 {
@@ -79,23 +84,38 @@ private:
     std::string m_model_filename;
     // Print volume bounding box exteded with axes and model.
     BoundingBoxf3 m_extended_bounding_box;
+#if ENABLE_GLBEGIN_GLEND_REMOVAL
+    // Print bed polygon
+    ExPolygon m_contour;
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
     // Slightly expanded print bed polygon, for collision detection.
     Polygon m_polygon;
+#if ENABLE_GLBEGIN_GLEND_REMOVAL
+    GLModel m_triangles;
+    GLModel m_gridlines;
+#else
     GeometryBuffer m_triangles;
     GeometryBuffer m_gridlines;
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
     GLTexture m_texture;
     // temporary texture shown until the main texture has still no levels compressed
     GLTexture m_temp_texture;
     GLModel m_model;
     Vec3d m_model_offset{ Vec3d::Zero() };
+#if !ENABLE_GLBEGIN_GLEND_REMOVAL
     unsigned int m_vbo_id{ 0 };
+#endif // !ENABLE_GLBEGIN_GLEND_REMOVAL
     Axes m_axes;
 
     float m_scale_factor{ 1.0f };
 
 public:
     Bed3D() = default;
+#if ENABLE_GLBEGIN_GLEND_REMOVAL
+    ~Bed3D() = default;
+#else
     ~Bed3D() { release_VBOs(); }
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
 
     // Update print bed model from configuration.
     // Return true if the bed shape changed, so the calee will update the UI.
@@ -125,8 +145,13 @@ public:
 private:
     // Calculate an extended bounding box from axes and current model for visualization purposes.
     BoundingBoxf3 calc_extended_bounding_box() const;
+#if ENABLE_GLBEGIN_GLEND_REMOVAL
+    void init_triangles();
+    void init_gridlines();
+#else
     void calc_triangles(const ExPolygon& poly);
     void calc_gridlines(const ExPolygon& poly, const BoundingBox& bed_bbox);
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
     static std::tuple<Type, std::string, std::string> detect_type(const Pointfs& shape);
     void render_internal(GLCanvas3D& canvas, bool bottom, float scale_factor,
         bool show_axes, bool show_texture, bool picking);
@@ -136,7 +161,9 @@ private:
     void render_model();
     void render_custom(GLCanvas3D& canvas, bool bottom, bool show_texture, bool picking);
     void render_default(bool bottom, bool picking);
+#if !ENABLE_GLBEGIN_GLEND_REMOVAL
     void release_VBOs();
+#endif // !ENABLE_GLBEGIN_GLEND_REMOVAL
 };
 
 } // GUI
diff --git a/src/slic3r/GUI/3DScene.cpp b/src/slic3r/GUI/3DScene.cpp
index 4e929d060..339754790 100644
--- a/src/slic3r/GUI/3DScene.cpp
+++ b/src/slic3r/GUI/3DScene.cpp
@@ -326,8 +326,8 @@ void GLVolume::SinkingContours::update()
             for (const ExPolygon& expoly : diff_ex(expand(polygons, float(scale_(HalfWidth))), shrink(polygons, float(scale_(HalfWidth))))) {
 #if ENABLE_GLBEGIN_GLEND_REMOVAL
                 const std::vector<Vec3d> triangulation = triangulate_expolygon_3d(expoly);
-                init_data.vertices.reserve(init_data.vertices.size() + triangulation.size() * GUI::GLModel::Geometry::vertex_stride_floats(init_data.format));
-                init_data.indices.reserve(init_data.indices.size() + triangulation.size() * GUI::GLModel::Geometry::index_stride_bytes(init_data.format));
+                init_data.reserve_vertices(init_data.vertices_count() + triangulation.size());
+                init_data.reserve_indices(init_data.indices_count() + triangulation.size());
                 for (const Vec3d& v : triangulation) {
                     init_data.add_vertex((Vec3f)(v.cast<float>() + 0.015f * Vec3f::UnitZ())); // add a small positive z to avoid z-fighting
                     ++vertices_counter;
@@ -400,9 +400,10 @@ void GLVolume::NonManifoldEdges::update()
             if (!edges.empty()) {
                 GUI::GLModel::Geometry init_data;
 #if ENABLE_GLBEGIN_GLEND_REMOVAL
-                init_data.format = { GUI::GLModel::Geometry::EPrimitiveType::Lines, GUI::GLModel::Geometry::EVertexLayout::P3, GUI::GLModel::Geometry::EIndexType::UINT };
-                init_data.vertices.reserve(2 * edges.size() * GUI::GLModel::Geometry::vertex_stride_floats(init_data.format));
-                init_data.indices.reserve(2 * edges.size() * GUI::GLModel::Geometry::index_stride_bytes(init_data.format));
+                const GUI::GLModel::Geometry::EIndexType index_type = (2 * edges.size() < 65536) ? GUI::GLModel::Geometry::EIndexType::USHORT : GUI::GLModel::Geometry::EIndexType::UINT;
+                init_data.format = { GUI::GLModel::Geometry::EPrimitiveType::Lines, GUI::GLModel::Geometry::EVertexLayout::P3, index_type };
+                init_data.reserve_vertices(2 * edges.size());
+                init_data.reserve_indices(2 * edges.size());
 
                 // vertices + indices
                 unsigned int vertices_count = 0;
@@ -410,7 +411,10 @@ void GLVolume::NonManifoldEdges::update()
                     init_data.add_vertex((Vec3f)mesh.its.vertices[edge.first].cast<float>());
                     init_data.add_vertex((Vec3f)mesh.its.vertices[edge.second].cast<float>());
                     vertices_count += 2;
-                    init_data.add_uint_line(vertices_count - 2, vertices_count - 1);
+                    if (index_type == GUI::GLModel::Geometry::EIndexType::USHORT)
+                        init_data.add_ushort_line((unsigned short)vertices_count - 2, (unsigned short)vertices_count - 1);
+                    else
+                        init_data.add_uint_line(vertices_count - 2, vertices_count - 1);
                 }
                 m_model.init_from(std::move(init_data));
 #else
diff --git a/src/slic3r/GUI/BackgroundSlicingProcess.cpp b/src/slic3r/GUI/BackgroundSlicingProcess.cpp
index 5f7b4e8d3..5d3d47c20 100644
--- a/src/slic3r/GUI/BackgroundSlicingProcess.cpp
+++ b/src/slic3r/GUI/BackgroundSlicingProcess.cpp
@@ -190,7 +190,7 @@ void BackgroundSlicingProcess::process_sla()
             	ThumbnailsParams{current_print()->full_print_config().option<ConfigOptionPoints>("thumbnails")->values, true, true, true, true});
 
             Zipper zipper(export_path);
-            m_sla_archive.export_print(zipper, *m_sla_print);																											         // true, false, true, true); // renders also supports and pad
+            m_sla_print->export_print(zipper);
 			for (const ThumbnailData& data : thumbnails)
                 if (data.is_valid())
                     write_thumbnail(zipper, data);
@@ -741,7 +741,7 @@ void BackgroundSlicingProcess::prepare_upload()
         	ThumbnailsParams{current_print()->full_print_config().option<ConfigOptionPoints>("thumbnails")->values, true, true, true, true});
 																												 // true, false, true, true); // renders also supports and pad
         Zipper zipper{source_path.string()};
-        m_sla_archive.export_print(zipper, *m_sla_print, m_upload_job.upload_data.upload_path.string());
+        m_sla_print->export_print(zipper, m_upload_job.upload_data.upload_path.string());
         for (const ThumbnailData& data : thumbnails)
 	        if (data.is_valid())
 	            write_thumbnail(zipper, data);
diff --git a/src/slic3r/GUI/BackgroundSlicingProcess.hpp b/src/slic3r/GUI/BackgroundSlicingProcess.hpp
index 5fba237e3..00a3ab6d0 100644
--- a/src/slic3r/GUI/BackgroundSlicingProcess.hpp
+++ b/src/slic3r/GUI/BackgroundSlicingProcess.hpp
@@ -11,7 +11,6 @@
 
 #include "libslic3r/PrintBase.hpp"
 #include "libslic3r/GCode/ThumbnailData.hpp"
-#include "libslic3r/Format/SL1.hpp"
 #include "slic3r/Utils/PrintHost.hpp"
 #include "libslic3r/GCode/GCodeProcessor.hpp"
 
@@ -84,7 +83,7 @@ public:
 	~BackgroundSlicingProcess();
 
 	void set_fff_print(Print *print) { m_fff_print = print; }
-    void set_sla_print(SLAPrint *print) { m_sla_print = print; m_sla_print->set_printer(&m_sla_archive); }
+    void set_sla_print(SLAPrint *print) { m_sla_print = print; }
 	void set_thumbnail_cb(ThumbnailsGeneratorCallback cb) { m_thumbnail_cb = cb; }
 	void set_gcode_result(GCodeProcessorResult* result) { m_gcode_result = result; }
 
@@ -218,9 +217,9 @@ private:
 	// Data structure, to which the G-code export writes its annotations.
 	GCodeProcessorResult     *m_gcode_result 		 = nullptr;
 	// Callback function, used to write thumbnails into gcode.
-	ThumbnailsGeneratorCallback m_thumbnail_cb 	     = nullptr;
-	SL1Archive                  m_sla_archive;
-		// Temporary G-code, there is one defined for the BackgroundSlicingProcess, differentiated from the other processes by a process ID.
+    ThumbnailsGeneratorCallback m_thumbnail_cb 	     = nullptr;
+    // Temporary G-code, there is one defined for the BackgroundSlicingProcess,
+    // differentiated from the other processes by a process ID.
 	std::string 				m_temp_output_path;
 	// Output path provided by the user. The output path may be set even if the slicing is running,
 	// but once set, it cannot be re-set.
diff --git a/src/slic3r/GUI/GCodeViewer.cpp b/src/slic3r/GUI/GCodeViewer.cpp
index 367846f0c..d54c28293 100644
--- a/src/slic3r/GUI/GCodeViewer.cpp
+++ b/src/slic3r/GUI/GCodeViewer.cpp
@@ -103,7 +103,11 @@ void GCodeViewer::IBuffer::reset()
     count = 0;
 }
 
+#if ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
+bool GCodeViewer::Path::matches(const GCodeProcessorResult::MoveVertex& move, bool account_for_volumetric_rate) const
+#else
 bool GCodeViewer::Path::matches(const GCodeProcessorResult::MoveVertex& move) const
+#endif // ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
 {
     auto matches_percent = [](float value1, float value2, float max_percent) {
         return std::abs(value2 - value1) / value1 <= max_percent;
@@ -120,10 +124,22 @@ bool GCodeViewer::Path::matches(const GCodeProcessorResult::MoveVertex& move) co
     case EMoveType::Seam:
     case EMoveType::Extrude: {
         // use rounding to reduce the number of generated paths
+#if ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
+        if (account_for_volumetric_rate)
+            return type == move.type && extruder_id == move.extruder_id && cp_color_id == move.cp_color_id && role == move.extrusion_role &&
+                move.position.z() <= sub_paths.front().first.position.z() && feedrate == move.feedrate && fan_speed == move.fan_speed &&
+                height == round_to_bin(move.height) && width == round_to_bin(move.width) &&
+                matches_percent(volumetric_rate, move.volumetric_rate(), 0.001f);
+        else
+            return type == move.type && extruder_id == move.extruder_id && cp_color_id == move.cp_color_id && role == move.extrusion_role &&
+                move.position.z() <= sub_paths.front().first.position.z() && feedrate == move.feedrate && fan_speed == move.fan_speed &&
+                height == round_to_bin(move.height) && width == round_to_bin(move.width);
+#else
         return type == move.type && extruder_id == move.extruder_id && cp_color_id == move.cp_color_id && role == move.extrusion_role &&
             move.position.z() <= sub_paths.front().first.position.z() && feedrate == move.feedrate && fan_speed == move.fan_speed &&
             height == round_to_bin(move.height) && width == round_to_bin(move.width) &&
             matches_percent(volumetric_rate, move.volumetric_rate(), 0.05f);
+#endif // ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
     }
     case EMoveType::Travel: {
         return type == move.type && feedrate == move.feedrate && extruder_id == move.extruder_id && cp_color_id == move.cp_color_id;
@@ -160,6 +176,66 @@ void GCodeViewer::TBuffer::add_path(const GCodeProcessorResult::MoveVertex& move
         move.volumetric_rate(), move.extruder_id, move.cp_color_id, { { endpoint, endpoint } } });
 }
 
+#if ENABLE_SHOW_TOOLPATHS_COG
+void GCodeViewer::COG::render()
+{
+    if (!m_visible)
+        return;
+
+    init();
+
+    GLShaderProgram* shader = wxGetApp().get_shader("toolpaths_cog");
+    if (shader == nullptr)
+        return;
+
+    shader->start_using();
+
+    glsafe(::glDisable(GL_DEPTH_TEST));
+
+    glsafe(::glPushMatrix());
+    const Vec3d position = cog();
+    glsafe(::glTranslated(position.x(), position.y(), position.z()));
+    if (m_fixed_size) {
+        const double inv_zoom = wxGetApp().plater()->get_camera().get_inv_zoom();
+        glsafe(::glScaled(inv_zoom, inv_zoom, inv_zoom));
+    }
+    m_model.render();
+
+    glsafe(::glPopMatrix());
+
+    shader->stop_using();
+
+    ////Show ImGui window 
+    //static float last_window_width = 0.0f;
+    //static size_t last_text_length = 0;
+
+    //ImGuiWrapper& imgui = *wxGetApp().imgui();
+    //const Size cnv_size = wxGetApp().plater()->get_current_canvas3D()->get_canvas_size();
+    //imgui.set_next_window_pos(0.5f * static_cast<float>(cnv_size.get_width()), 0.0f, ImGuiCond_Always, 0.5f, 0.0f);
+    //ImGui::PushStyleVar(ImGuiStyleVar_WindowRounding, 0.0f);
+    //ImGui::SetNextWindowBgAlpha(0.25f);
+    //imgui.begin(std::string("COG"), ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoDecoration | ImGuiWindowFlags_NoMove);
+    //imgui.text_colored(ImGuiWrapper::COL_ORANGE_LIGHT, _u8L("Center of mass") + ":");
+    //ImGui::SameLine();
+    //char buf[1024];
+    //const Vec3d position = cog();
+    //sprintf(buf, "X: %.3f, Y: %.3f, Z: %.3f", position.x(), position.y(), position.z());
+    //imgui.text(std::string(buf));
+
+    //// force extra frame to automatically update window size
+    //const float width = ImGui::GetWindowWidth();
+    //const size_t length = strlen(buf);
+    //if (width != last_window_width || length != last_text_length) {
+    //    last_window_width = width;
+    //    last_text_length = length;
+    //    imgui.set_requires_extra_frame();
+    //}
+
+    //imgui.end();
+    //ImGui::PopStyleVar();
+}
+#endif // ENABLE_SHOW_TOOLPATHS_COG
+
 #if ENABLE_PREVIEW_LAYER_TIME
 float GCodeViewer::Extrusions::Range::step_size(EType type) const
 {
@@ -638,10 +714,19 @@ void GCodeViewer::init()
 void GCodeViewer::load(const GCodeProcessorResult& gcode_result, const Print& print, bool initialized)
 {
     // avoid processing if called with the same gcode_result
+#if ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
+    if (m_last_result_id == gcode_result.id &&
+        (m_last_view_type == m_view_type || (m_last_view_type != EViewType::VolumetricRate && m_view_type != EViewType::VolumetricRate)))
+        return;
+#else
     if (m_last_result_id == gcode_result.id)
         return;
+#endif // ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
 
     m_last_result_id = gcode_result.id;
+#if ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
+    m_last_view_type = m_view_type;
+#endif // ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
 
     // release gpu memory, if used
     reset(); 
@@ -955,6 +1040,9 @@ unsigned int GCodeViewer::get_options_visibility_flags() const
     flags = set_flag(flags, static_cast<unsigned int>(Preview::OptionType::ColorChanges), is_toolpath_move_type_visible(EMoveType::Color_change));
     flags = set_flag(flags, static_cast<unsigned int>(Preview::OptionType::PausePrints), is_toolpath_move_type_visible(EMoveType::Pause_Print));
     flags = set_flag(flags, static_cast<unsigned int>(Preview::OptionType::CustomGCodes), is_toolpath_move_type_visible(EMoveType::Custom_GCode));
+#if ENABLE_SHOW_TOOLPATHS_COG
+    flags = set_flag(flags, static_cast<unsigned int>(Preview::OptionType::CenterOfGravity), m_cog.is_visible());
+#endif // ENABLE_SHOW_TOOLPATHS_COG
     flags = set_flag(flags, static_cast<unsigned int>(Preview::OptionType::Shells), m_shells.visible);
     flags = set_flag(flags, static_cast<unsigned int>(Preview::OptionType::ToolMarker), m_sequential_view.marker.is_visible());
 #if !ENABLE_PREVIEW_LAYOUT
@@ -978,6 +1066,9 @@ void GCodeViewer::set_options_visibility_from_flags(unsigned int flags)
     set_toolpath_move_type_visible(EMoveType::Color_change, is_flag_set(static_cast<unsigned int>(Preview::OptionType::ColorChanges)));
     set_toolpath_move_type_visible(EMoveType::Pause_Print, is_flag_set(static_cast<unsigned int>(Preview::OptionType::PausePrints)));
     set_toolpath_move_type_visible(EMoveType::Custom_GCode, is_flag_set(static_cast<unsigned int>(Preview::OptionType::CustomGCodes)));
+#if ENABLE_SHOW_TOOLPATHS_COG
+    m_cog.set_visible(is_flag_set(static_cast<unsigned int>(Preview::OptionType::CenterOfGravity)));
+#endif // ENABLE_SHOW_TOOLPATHS_COG
     m_shells.visible = is_flag_set(static_cast<unsigned int>(Preview::OptionType::Shells));
     m_sequential_view.marker.set_visible(is_flag_set(static_cast<unsigned int>(Preview::OptionType::ToolMarker)));
 #if !ENABLE_PREVIEW_LAYOUT
@@ -1200,9 +1291,15 @@ void GCodeViewer::load_toolpaths(const GCodeProcessorResult& gcode_result)
         // add current vertex
         add_vertex(curr);
     };
+#if ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
+    auto add_indices_as_line = [](const GCodeProcessorResult::MoveVertex& prev, const GCodeProcessorResult::MoveVertex& curr, TBuffer& buffer,
+        unsigned int ibuffer_id, IndexBuffer& indices, size_t move_id, bool account_for_volumetric_rate) {
+            if (buffer.paths.empty() || prev.type != curr.type || !buffer.paths.back().matches(curr, account_for_volumetric_rate)) {
+#else
     auto add_indices_as_line = [](const GCodeProcessorResult::MoveVertex& prev, const GCodeProcessorResult::MoveVertex& curr, TBuffer& buffer,
         unsigned int ibuffer_id, IndexBuffer& indices, size_t move_id) {
             if (buffer.paths.empty() || prev.type != curr.type || !buffer.paths.back().matches(curr)) {
+#endif // ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
                 // add starting index
                 indices.push_back(static_cast<IBufferType>(indices.size()));
                 buffer.add_path(curr, ibuffer_id, indices.size() - 1, move_id - 1);
@@ -1221,7 +1318,13 @@ void GCodeViewer::load_toolpaths(const GCodeProcessorResult& gcode_result)
     };
 
     // format data into the buffers to be rendered as solid
-    auto add_vertices_as_solid = [](const GCodeProcessorResult::MoveVertex& prev, const GCodeProcessorResult::MoveVertex& curr, TBuffer& buffer, unsigned int vbuffer_id, VertexBuffer& vertices, size_t move_id) {
+#if ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
+    auto add_vertices_as_solid = [](const GCodeProcessorResult::MoveVertex& prev, const GCodeProcessorResult::MoveVertex& curr, TBuffer& buffer,
+        unsigned int vbuffer_id, VertexBuffer& vertices, size_t move_id, bool account_for_volumetric_rate) {
+#else
+    auto add_vertices_as_solid = [](const GCodeProcessorResult::MoveVertex& prev, const GCodeProcessorResult::MoveVertex& curr, TBuffer& buffer,
+        unsigned int vbuffer_id, VertexBuffer& vertices, size_t move_id) {
+#endif // ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
         auto store_vertex = [](VertexBuffer& vertices, const Vec3f& position, const Vec3f& normal) {
             // append position
             vertices.push_back(position.x());
@@ -1233,7 +1336,11 @@ void GCodeViewer::load_toolpaths(const GCodeProcessorResult& gcode_result)
             vertices.push_back(normal.z());
         };
 
+#if ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
+        if (buffer.paths.empty() || prev.type != curr.type || !buffer.paths.back().matches(curr, account_for_volumetric_rate)) {
+#else
         if (buffer.paths.empty() || prev.type != curr.type || !buffer.paths.back().matches(curr)) {
+#endif // ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
             buffer.add_path(curr, vbuffer_id, vertices.size(), move_id - 1);
             buffer.paths.back().sub_paths.back().first.position = prev.position;
         }
@@ -1278,8 +1385,15 @@ void GCodeViewer::load_toolpaths(const GCodeProcessorResult& gcode_result)
 
         last_path.sub_paths.back().last = { vbuffer_id, vertices.size(), move_id, curr.position };
     };
-    auto add_indices_as_solid = [&](const GCodeProcessorResult::MoveVertex& prev, const GCodeProcessorResult::MoveVertex& curr, const GCodeProcessorResult::MoveVertex* next,
-        TBuffer& buffer, size_t& vbuffer_size, unsigned int ibuffer_id, IndexBuffer& indices, size_t move_id) {
+#if ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
+    auto add_indices_as_solid = [&](const GCodeProcessorResult::MoveVertex& prev, const GCodeProcessorResult::MoveVertex& curr,
+        const GCodeProcessorResult::MoveVertex* next, TBuffer& buffer, size_t& vbuffer_size, unsigned int ibuffer_id,
+        IndexBuffer& indices, size_t move_id, bool account_for_volumetric_rate) {
+#else
+    auto add_indices_as_solid = [&](const GCodeProcessorResult::MoveVertex& prev, const GCodeProcessorResult::MoveVertex& curr,
+        const GCodeProcessorResult::MoveVertex* next, TBuffer& buffer, size_t& vbuffer_size, unsigned int ibuffer_id, 
+        IndexBuffer& indices, size_t move_id) {
+#endif // ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
             static Vec3f prev_dir;
             static Vec3f prev_up;
             static float sq_prev_length;
@@ -1324,7 +1438,11 @@ void GCodeViewer::load_toolpaths(const GCodeProcessorResult& gcode_result)
                 store_triangle(indices, v_offsets[4], v_offsets[5], v_offsets[6]);
             };
 
+#if ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
+            if (buffer.paths.empty() || prev.type != curr.type || !buffer.paths.back().matches(curr, account_for_volumetric_rate)) {
+#else
             if (buffer.paths.empty() || prev.type != curr.type || !buffer.paths.back().matches(curr)) {
+#endif // ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
                 buffer.add_path(curr, ibuffer_id, indices.size(), move_id - 1);
                 buffer.paths.back().sub_paths.back().first.position = prev.position;
             }
@@ -1408,7 +1526,11 @@ void GCodeViewer::load_toolpaths(const GCodeProcessorResult& gcode_result)
                 vbuffer_size += 6;
             }
 
+#if ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
+            if (next != nullptr && (curr.type != next->type || !last_path.matches(*next, account_for_volumetric_rate)))
+#else
             if (next != nullptr && (curr.type != next->type || !last_path.matches(*next)))
+#endif // ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
                 // ending cap triangles
                 append_ending_cap_triangles(indices, is_first_segment ? first_seg_v_offsets : non_first_seg_v_offsets);
 
@@ -1537,6 +1659,10 @@ void GCodeViewer::load_toolpaths(const GCodeProcessorResult& gcode_result)
     if (wxGetApp().is_editor())
         m_contained_in_bed = wxGetApp().plater()->build_volume().all_paths_inside(gcode_result, m_paths_bounding_box);
 
+#if ENABLE_SHOW_TOOLPATHS_COG
+    m_cog.reset();
+#endif // ENABLE_SHOW_TOOLPATHS_COG
+
     m_sequential_view.gcode_ids.clear();
     for (size_t i = 0; i < gcode_result.moves.size(); ++i) {
         const GCodeProcessorResult::MoveVertex& move = gcode_result.moves[i];
@@ -1544,6 +1670,10 @@ void GCodeViewer::load_toolpaths(const GCodeProcessorResult& gcode_result)
             m_sequential_view.gcode_ids.push_back(move.gcode_id);
     }
 
+#if ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
+    bool account_for_volumetric_rate = m_view_type == EViewType::VolumetricRate;
+#endif // ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
+
     std::vector<MultiVertexBuffer> vertices(m_buffers.size());
     std::vector<MultiIndexBuffer> indices(m_buffers.size());
     std::vector<InstanceBuffer> instances(m_buffers.size());
@@ -1551,18 +1681,15 @@ void GCodeViewer::load_toolpaths(const GCodeProcessorResult& gcode_result)
     std::vector<InstancesOffsets> instances_offsets(m_buffers.size());
     std::vector<float> options_zs;
 
-    size_t seams_count = 0;
     std::vector<size_t> biased_seams_ids;
 
     // toolpaths data -> extract vertices from result
     for (size_t i = 0; i < m_moves_count; ++i) {
         const GCodeProcessorResult::MoveVertex& curr = gcode_result.moves[i];
-        if (curr.type == EMoveType::Seam) {
-            ++seams_count;
+        if (curr.type == EMoveType::Seam)
             biased_seams_ids.push_back(i - biased_seams_ids.size() - 1);
-        }
 
-        size_t move_id = i - seams_count;
+        const size_t move_id = i - biased_seams_ids.size();
 
         // skip first vertex
         if (i == 0)
@@ -1570,6 +1697,20 @@ void GCodeViewer::load_toolpaths(const GCodeProcessorResult& gcode_result)
 
         const GCodeProcessorResult::MoveVertex& prev = gcode_result.moves[i - 1];
 
+#if ENABLE_SHOW_TOOLPATHS_COG
+        if (curr.type == EMoveType::Extrude &&
+            curr.extrusion_role != erSkirt &&
+            curr.extrusion_role != erSupportMaterial &&
+            curr.extrusion_role != erSupportMaterialInterface &&
+            curr.extrusion_role != erWipeTower &&
+            curr.extrusion_role != erCustom &&
+            curr.extrusion_role != erMixed) {
+            const Vec3d curr_pos = curr.position.cast<double>();
+            const Vec3d prev_pos = prev.position.cast<double>();
+            m_cog.add_segment(curr_pos, prev_pos, curr.mm3_per_mm * (curr_pos - prev_pos).norm());
+        }
+#endif // ENABLE_SHOW_TOOLPATHS_COG
+
         // update progress dialog
         ++progress_count;
         if (progress_dialog != nullptr && progress_count % progress_threshold == 0) {
@@ -1597,7 +1738,11 @@ void GCodeViewer::load_toolpaths(const GCodeProcessorResult& gcode_result)
             v_multibuffer.push_back(VertexBuffer());
             if (t_buffer.render_primitive_type == TBuffer::ERenderPrimitiveType::Triangle) {
                 Path& last_path = t_buffer.paths.back();
+#if ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
+                if (prev.type == curr.type && last_path.matches(curr, account_for_volumetric_rate))
+#else
                 if (prev.type == curr.type && last_path.matches(curr))
+#endif // ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
                     last_path.add_sub_path(prev, static_cast<unsigned int>(v_multibuffer.size()) - 1, 0, move_id - 1);
             }
         }
@@ -1608,7 +1753,11 @@ void GCodeViewer::load_toolpaths(const GCodeProcessorResult& gcode_result)
         {
         case TBuffer::ERenderPrimitiveType::Point:    { add_vertices_as_point(curr, v_buffer); break; }
         case TBuffer::ERenderPrimitiveType::Line:     { add_vertices_as_line(prev, curr, v_buffer); break; }
+#if ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
+        case TBuffer::ERenderPrimitiveType::Triangle: { add_vertices_as_solid(prev, curr, t_buffer, static_cast<unsigned int>(v_multibuffer.size()) - 1, v_buffer, move_id, account_for_volumetric_rate); break; }
+#else
         case TBuffer::ERenderPrimitiveType::Triangle: { add_vertices_as_solid(prev, curr, t_buffer, static_cast<unsigned int>(v_multibuffer.size()) - 1, v_buffer, move_id); break; }
+#endif // ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
         case TBuffer::ERenderPrimitiveType::InstancedModel:
         {
             add_model_instance(curr, inst_buffer, inst_id_buffer, move_id);
@@ -1893,14 +2042,14 @@ void GCodeViewer::load_toolpaths(const GCodeProcessorResult& gcode_result)
     using VboIndexList = std::vector<unsigned int>;
     std::vector<VboIndexList> vbo_indices(m_buffers.size());
 
-    seams_count = 0;
+    size_t seams_count = 0;
 
     for (size_t i = 0; i < m_moves_count; ++i) {
         const GCodeProcessorResult::MoveVertex& curr = gcode_result.moves[i];
         if (curr.type == EMoveType::Seam)
             ++seams_count;
 
-        size_t move_id = i - seams_count;
+        const size_t move_id = i - seams_count;
 
         // skip first vertex
         if (i == 0)
@@ -1972,12 +2121,20 @@ void GCodeViewer::load_toolpaths(const GCodeProcessorResult& gcode_result)
             break;
         }
         case TBuffer::ERenderPrimitiveType::Line: {
+#if ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
+            add_indices_as_line(prev, curr, t_buffer, static_cast<unsigned int>(i_multibuffer.size()) - 1, i_buffer, move_id, account_for_volumetric_rate);
+#else
             add_indices_as_line(prev, curr, t_buffer, static_cast<unsigned int>(i_multibuffer.size()) - 1, i_buffer, move_id);
+#endif // ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
             curr_vertex_buffer.second += t_buffer.max_vertices_per_segment();
             break;
         }
         case TBuffer::ERenderPrimitiveType::Triangle: {
+#if ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
+            add_indices_as_solid(prev, curr, next, t_buffer, curr_vertex_buffer.second, static_cast<unsigned int>(i_multibuffer.size()) - 1, i_buffer, move_id, account_for_volumetric_rate);
+#else
             add_indices_as_solid(prev, curr, next, t_buffer, curr_vertex_buffer.second, static_cast<unsigned int>(i_multibuffer.size()) - 1, i_buffer, move_id);
+#endif // ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
             break;
         }
         case TBuffer::ERenderPrimitiveType::BatchedModel: {
@@ -4074,15 +4231,6 @@ void GCodeViewer::render_legend(float& legend_height)
     };
 
 #if ENABLE_LEGEND_TOOLBAR_ICONS
-//    auto circle_icon = [](ImGuiWindow& window, const ImVec2& pos, float size, const Color& color) {
-//        const float margin = 3.0f;
-//        const ImVec2 center(0.5f * (pos.x + pos.x + size), 0.5f * (pos.y + pos.y + size));
-//        window.DrawList->AddCircleFilled(center, 0.5f * (size - 2.0f * margin), ImGui::GetColorU32({ color[0], color[1], color[2], 1.0f }), 16);
-//    };
-//    auto line_icon = [](ImGuiWindow& window, const ImVec2& pos, float size, const Color& color) {
-//        const float margin = 3.0f;
-//        window.DrawList->AddLine({ pos.x + margin, pos.y + size - margin }, { pos.x + size - margin, pos.y + margin }, ImGui::GetColorU32({ color[0], color[1], color[2], 1.0f }), 3.0f);
-//    };
     auto image_icon = [&imgui](ImGuiWindow& window, const ImVec2& pos, float size, const wchar_t& icon_id) {
         ImGuiIO& io = ImGui::GetIO();
         const ImTextureID tex_id = io.Fonts->TexID;
@@ -4091,17 +4239,17 @@ void GCodeViewer::render_legend(float& legend_height)
         const ImFontAtlas::CustomRect* const rect = imgui.GetTextureCustomRect(icon_id);
         const ImVec2 uv0 = { static_cast<float>(rect->X) / tex_w, static_cast<float>(rect->Y) / tex_h };
         const ImVec2 uv1 = { static_cast<float>(rect->X + rect->Width) / tex_w, static_cast<float>(rect->Y + rect->Height) / tex_h };
-        window.DrawList->AddImage(tex_id, pos, { pos.x + size, pos.y + size }, uv0, uv1, ImGui::GetColorU32({ 1.0f, 1.0f, 1.0f, 1.0f }));
+        window.DrawList->AddImage(tex_id, pos, { pos.x + size, pos.y + size }, uv0, uv1, ImGuiWrapper::to_ImU32({ 1.0f, 1.0f, 1.0f, 1.0f }));
     };
 #else
-        auto circle_icon = [](ImGuiWindow& window, const ImVec2& pos, float size, const Color& color) {
-            const float margin = 3.0f;
+        auto circle_icon = [](ImGuiWindow& window, const ImVec2& pos, float size, const ColorRGBA& color) {
+           const float margin = 3.0f;
             const ImVec2 center(0.5f * (pos.x + pos.x + size), 0.5f * (pos.y + pos.y + size));
-            window.DrawList->AddCircleFilled(center, 0.5f * (size - 2.0f * margin), ImGui::GetColorU32({ color[0], color[1], color[2], 1.0f }), 16);
+            window.DrawList->AddCircleFilled(center, 0.5f * (size - 2.0f * margin), ImGuiWrapper::to_ImU32(color), 16);
         };
-        auto line_icon = [](ImGuiWindow& window, const ImVec2& pos, float size, const Color& color) {
+        auto line_icon = [](ImGuiWindow& window, const ImVec2& pos, float size, const ColorRGBA& color) {
             const float margin = 3.0f;
-            window.DrawList->AddLine({ pos.x + margin, pos.y + size - margin }, { pos.x + size - margin, pos.y + margin }, ImGui::GetColorU32({ color[0], color[1], color[2], 1.0f }), 3.0f);
+            window.DrawList->AddLine({ pos.x + margin, pos.y + size - margin }, { pos.x + size - margin, pos.y + margin }, ImGuiWrapper::to_ImU32(color), 3.0f);
         };
 #endif // ENABLE_LEGEND_TOOLBAR_ICONS
 
@@ -4190,12 +4338,41 @@ void GCodeViewer::render_legend(float& legend_height)
 #endif // ENABLE_LEGEND_TOOLBAR_ICONS
         });
     ImGui::SameLine();
+#if ENABLE_SHOW_TOOLPATHS_COG
+#if ENABLE_LEGEND_TOOLBAR_ICONS
+    toggle_button(Preview::OptionType::CenterOfGravity, _u8L("Center of gravity"), [image_icon](ImGuiWindow& window, const ImVec2& pos, float size) {
+        image_icon(window, pos, size, ImGui::LegendCOG);
+        });
+#else
+    toggle_button(Preview::OptionType::CenterOfGravity, _u8L("Center of gravity"), [](ImGuiWindow& window, const ImVec2& pos, float size) {
+        const ImU32 black = ImGuiWrapper::to_ImU32({ 0.0f, 0.0f, 0.0f, 1.0f });
+        const ImU32 white = ImGuiWrapper::to_ImU32({ 1.0f, 1.0f, 1.0f, 1.0f });
+        const float margin = 3.0f;
+        const ImVec2 center(0.5f * (pos.x + pos.x + size), 0.5f * (pos.y + pos.y + size));
+        const float radius = 0.5f * (size - 2.0f * margin);
+        window.DrawList->PathArcToFast(center, radius, 0, 3);
+        window.DrawList->PathLineTo(center);
+        window.DrawList->PathFillConvex(black);
+        window.DrawList->PathArcToFast(center, radius, 3, 6);
+        window.DrawList->PathLineTo(center);
+        window.DrawList->PathFillConvex(white);
+        window.DrawList->PathArcToFast(center, radius, 6, 9);
+        window.DrawList->PathLineTo(center);
+        window.DrawList->PathFillConvex(black);
+        window.DrawList->PathArcToFast(center, radius, 9, 12);
+        window.DrawList->PathLineTo(center);
+        window.DrawList->PathFillConvex(white);
+        window.DrawList->AddCircle(center, radius, black, 16);
+        });
+#endif // ENABLE_LEGEND_TOOLBAR_ICONS
+    ImGui::SameLine();
+#endif // ENABLE_SHOW_TOOLPATHS_COG
 #if ENABLE_LEGEND_TOOLBAR_ICONS
     toggle_button(Preview::OptionType::Shells, _u8L("Shells"), [image_icon](ImGuiWindow& window, const ImVec2& pos, float size) {
         image_icon(window, pos, size, ImGui::LegendShells);
 #else
     toggle_button(Preview::OptionType::Shells, _u8L("Shells"), [](ImGuiWindow& window, const ImVec2& pos, float size) {
-        const ImU32 color = ImGui::GetColorU32({ 1.0f, 1.0f, 1.0f, 1.0f });
+        const ImU32 color = ImGuiWrapper::to_ImU32({ 1.0f, 1.0f, 1.0f, 1.0f });
         const float margin = 3.0f;
         const float proj = 0.25f * size;
         window.DrawList->AddRect({ pos.x + margin, pos.y + size - margin }, { pos.x + size - margin - proj, pos.y + margin + proj }, color);
@@ -4212,11 +4389,11 @@ void GCodeViewer::render_legend(float& legend_height)
         image_icon(window, pos, size, ImGui::LegendToolMarker);
 #else
     toggle_button(Preview::OptionType::ToolMarker, _u8L("Tool marker"), [](ImGuiWindow& window, const ImVec2& pos, float size) {
-        const ImU32 color = ImGui::GetColorU32({ 1.0f, 1.0f, 1.0f, 0.8f });
+        const ImU32 color = ImGuiWrapper::to_ImU32({ 1.0f, 1.0f, 1.0f, 0.8f });
         const float margin = 3.0f;
         const ImVec2 p1(0.5f * (pos.x + pos.x + size), pos.y + size - margin);
-        const ImVec2 p2 = ImVec2(p1.x + 0.25f * size, p1.y - 0.25f * size);
-        const ImVec2 p3 = ImVec2(p1.x - 0.25f * size, p1.y - 0.25f * size);
+        const ImVec2 p2(p1.x + 0.25f * size, p1.y - 0.25f * size);
+        const ImVec2 p3(p1.x - 0.25f * size, p1.y - 0.25f * size);
         window.DrawList->AddTriangleFilled(p1, p2, p3, color);
         const float mid_x = 0.5f * (pos.x + pos.x + size);
         window.DrawList->AddRectFilled({ mid_x - 0.09375f * size, p1.y - 0.25f * size }, { mid_x + 0.09375f * size, pos.y + margin }, color);
diff --git a/src/slic3r/GUI/GCodeViewer.hpp b/src/slic3r/GUI/GCodeViewer.hpp
index ecebb2641..b2b0626d5 100644
--- a/src/slic3r/GUI/GCodeViewer.hpp
+++ b/src/slic3r/GUI/GCodeViewer.hpp
@@ -212,7 +212,11 @@ class GCodeViewer
         unsigned char cp_color_id{ 0 };
         std::vector<Sub_Path> sub_paths;
 
+#if ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
+        bool matches(const GCodeProcessorResult::MoveVertex& move, bool account_for_volumetric_rate) const;
+#else
         bool matches(const GCodeProcessorResult::MoveVertex& move) const;
+#endif // ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
         size_t vertices_count() const {
             return sub_paths.empty() ? 0 : sub_paths.back().last.s_id - sub_paths.front().first.s_id + 1;
         }
@@ -380,6 +384,52 @@ class GCodeViewer
         bool visible{ false };
     };
 
+#if ENABLE_SHOW_TOOLPATHS_COG
+    // helper to render center of gravity
+    class COG
+    {
+        GLModel m_model;
+        bool m_visible{ false };
+        // whether or not to render the model with fixed screen size
+        bool m_fixed_size{ true };
+        double m_total_mass{ 0.0 };
+        Vec3d m_position{ Vec3d::Zero() };
+
+    public:
+        void render();
+
+        void reset() {
+            m_position = Vec3d::Zero();
+            m_total_mass = 0.0;
+        }
+
+        bool is_visible() const { return m_visible; }
+        void set_visible(bool visible) { m_visible = visible; }
+
+        void add_segment(const Vec3d& v1, const Vec3d& v2, double mass) {
+            assert(mass > 0.0);
+            m_position += mass * 0.5 * (v1 + v2);
+            m_total_mass += mass;
+        }
+
+        Vec3d cog() const { return (m_total_mass > 0.0) ? (Vec3d)(m_position / m_total_mass) : Vec3d::Zero(); }
+
+    private:
+        void init() {
+            if (m_model.is_initialized())
+                return;
+
+            const float radius = m_fixed_size ? 10.0f : 1.0f;
+
+#if ENABLE_GLBEGIN_GLEND_REMOVAL
+            m_model.init_from(smooth_sphere(32, radius));
+#else
+            m_model.init_from(its_make_sphere(radius, PI / 32.0));
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
+        }
+    };
+#endif // ENABLE_SHOW_TOOLPATHS_COG
+
     // helper to render extrusion paths
     struct Extrusions
     {
@@ -716,6 +766,9 @@ public:
 private:
     bool m_gl_data_initialized{ false };
     unsigned int m_last_result_id{ 0 };
+#if ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
+    EViewType m_last_view_type{ EViewType::Count };
+#endif // ENABLE_VOLUMETRIC_RATE_TOOLPATHS_RECALC
     size_t m_moves_count{ 0 };
     std::vector<TBuffer> m_buffers{ static_cast<size_t>(EMoveType::Extrude) };
     // bounding box of toolpaths
@@ -734,6 +787,9 @@ private:
     Extrusions m_extrusions;
     SequentialView m_sequential_view;
     Shells m_shells;
+#if ENABLE_SHOW_TOOLPATHS_COG
+    COG m_cog;
+#endif // ENABLE_SHOW_TOOLPATHS_COG
     EViewType m_view_type{ EViewType::FeatureType };
     bool m_legend_enabled{ true };
 #if ENABLE_PREVIEW_LAYOUT
@@ -779,6 +835,9 @@ public:
 
     void reset();
     void render();
+#if ENABLE_SHOW_TOOLPATHS_COG
+    void render_cog() { m_cog.render(); }
+#endif // ENABLE_SHOW_TOOLPATHS_COG
 
     bool has_data() const { return !m_roles.empty(); }
     bool can_export_toolpaths() const;
diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 84cc2e555..95600c074 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -368,8 +368,8 @@ void GLCanvas3D::LayersEditing::render_active_object_annotations(const GLCanvas3
 
         GLModel::Geometry init_data;
         init_data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P2T2, GLModel::Geometry::EIndexType::USHORT };
-        init_data.vertices.reserve(4 * GLModel::Geometry::vertex_stride_floats(init_data.format));
-        init_data.indices.reserve(6 * GLModel::Geometry::index_stride_bytes(init_data.format));
+        init_data.reserve_vertices(4);
+        init_data.reserve_indices(6);
 
         // vertices
         const float l = bar_rect.get_left();
@@ -428,8 +428,8 @@ void GLCanvas3D::LayersEditing::render_profile(const Rect& bar_rect)
         GLModel::Geometry init_data;
         init_data.format = { GLModel::Geometry::EPrimitiveType::Lines, GLModel::Geometry::EVertexLayout::P2, GLModel::Geometry::EIndexType::USHORT };
         init_data.color = ColorRGBA::BLACK();
-        init_data.vertices.reserve(2 * GLModel::Geometry::vertex_stride_floats(init_data.format));
-        init_data.indices.reserve(2 * GLModel::Geometry::index_stride_bytes(init_data.format));
+        init_data.reserve_vertices(2);
+        init_data.reserve_indices(2);
 
         // vertices
         const float x = bar_rect.get_left() + float(m_slicing_parameters->layer_height) * scale_x;
@@ -447,16 +447,20 @@ void GLCanvas3D::LayersEditing::render_profile(const Rect& bar_rect)
         m_profile.profile.reset();
 
         GLModel::Geometry init_data;
-        init_data.format = { GLModel::Geometry::EPrimitiveType::LineStrip, GLModel::Geometry::EVertexLayout::P2, GLModel::Geometry::EIndexType::UINT };
+        const GLModel::Geometry::EIndexType index_type = (m_layer_height_profile.size() / 2 < 65536) ? GLModel::Geometry::EIndexType::USHORT : GLModel::Geometry::EIndexType::UINT;
+        init_data.format = { GLModel::Geometry::EPrimitiveType::LineStrip, GLModel::Geometry::EVertexLayout::P2, index_type };
         init_data.color = ColorRGBA::BLUE();
-        init_data.vertices.reserve(m_layer_height_profile.size() * GLModel::Geometry::vertex_stride_floats(init_data.format));
-        init_data.indices.reserve(m_layer_height_profile.size() * GLModel::Geometry::index_stride_bytes(init_data.format));
+        init_data.reserve_vertices(m_layer_height_profile.size() / 2);
+        init_data.reserve_indices(m_layer_height_profile.size() / 2);
 
         // vertices + indices
         for (unsigned int i = 0; i < (unsigned int)m_layer_height_profile.size(); i += 2) {
             init_data.add_vertex(Vec2f(bar_rect.get_left() + float(m_layer_height_profile[i + 1]) * scale_x,
                                        bar_rect.get_bottom() + float(m_layer_height_profile[i]) * scale_y));
-            init_data.add_uint_index(i / 2);
+            if (index_type == GLModel::Geometry::EIndexType::USHORT)
+                init_data.add_ushort_index((unsigned short)i / 2);
+            else
+                init_data.add_uint_index(i / 2);
         }
 
         m_profile.profile.init_from(std::move(init_data));
@@ -898,6 +902,8 @@ void GLCanvas3D::SequentialPrintClearance::set_polygons(const Polygons& polygons
         unsigned int vertices_counter = 0;
         for (const ExPolygon& poly : polygons_union) {
             const std::vector<Vec3d> triangulation = triangulate_expolygon_3d(poly);
+            fill_data.reserve_vertices(fill_data.vertices_count() + triangulation.size());
+            fill_data.reserve_indices(fill_data.indices_count() + triangulation.size());
             for (const Vec3d& v : triangulation) {
                 fill_data.add_vertex((Vec3f)(v.cast<float>() + 0.0125f * Vec3f::UnitZ())); // add a small positive z to avoid z-fighting
                 ++vertices_counter;
@@ -1600,6 +1606,10 @@ void GLCanvas3D::render()
 #if ENABLE_RENDER_SELECTION_CENTER
     _render_selection_center();
 #endif // ENABLE_RENDER_SELECTION_CENTER
+#if ENABLE_SHOW_TOOLPATHS_COG
+    if (!m_main_toolbar.is_enabled())
+        _render_gcode_cog();
+#endif // ENABLE_SHOW_TOOLPATHS_COG
 
     // we need to set the mouse's scene position here because the depth buffer
     // could be invalidated by the following gizmo render methods
@@ -5234,8 +5244,8 @@ void GLCanvas3D::_render_background()
 
         GLModel::Geometry init_data;
         init_data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P2T2, GLModel::Geometry::EIndexType::USHORT };
-        init_data.vertices.reserve(4 * GLModel::Geometry::vertex_stride_floats(init_data.format));
-        init_data.indices.reserve(6 * GLModel::Geometry::index_stride_bytes(init_data.format));
+        init_data.reserve_vertices(4);
+        init_data.reserve_indices(6);
 
         // vertices
         init_data.add_vertex(Vec2f(-1.0f, -1.0f), Vec2f(0.0f, 0.0f));
@@ -5415,6 +5425,13 @@ void GLCanvas3D::_render_gcode()
     m_gcode_viewer.render();
 }
 
+#if ENABLE_SHOW_TOOLPATHS_COG
+void GLCanvas3D::_render_gcode_cog()
+{
+    m_gcode_viewer.render_cog();
+}
+#endif // ENABLE_SHOW_TOOLPATHS_COG
+
 void GLCanvas3D::_render_selection()
 {
     float scale_factor = 1.0;
diff --git a/src/slic3r/GUI/GLCanvas3D.hpp b/src/slic3r/GUI/GLCanvas3D.hpp
index ac1985f0f..702403e66 100644
--- a/src/slic3r/GUI/GLCanvas3D.hpp
+++ b/src/slic3r/GUI/GLCanvas3D.hpp
@@ -944,6 +944,9 @@ private:
     void _render_bed_for_picking(bool bottom);
     void _render_objects(GLVolumeCollection::ERenderType type);
     void _render_gcode();
+#if ENABLE_SHOW_TOOLPATHS_COG
+    void _render_gcode_cog();
+#endif // ENABLE_SHOW_TOOLPATHS_COG
     void _render_selection();
     void _render_sequential_clearance();
 #if ENABLE_RENDER_SELECTION_CENTER
diff --git a/src/slic3r/GUI/GLModel.cpp b/src/slic3r/GUI/GLModel.cpp
index 4d3be069c..e1dc3305c 100644
--- a/src/slic3r/GUI/GLModel.cpp
+++ b/src/slic3r/GUI/GLModel.cpp
@@ -18,6 +18,16 @@ namespace Slic3r {
 namespace GUI {
 
 #if ENABLE_GLBEGIN_GLEND_REMOVAL
+void GLModel::Geometry::reserve_vertices(size_t vertices_count)
+{
+    vertices.reserve(vertices_count * vertex_stride_floats(format));
+}
+
+void GLModel::Geometry::reserve_indices(size_t indices_count)
+{
+    indices.reserve(indices_count * index_stride_bytes(format));
+}
+
 void GLModel::Geometry::add_vertex(const Vec2f& position)
 {
     assert(format.vertex_layout == EVertexLayout::P2);
@@ -42,6 +52,16 @@ void GLModel::Geometry::add_vertex(const Vec3f& position)
     vertices.emplace_back(position.z());
 }
 
+void GLModel::Geometry::add_vertex(const Vec3f& position, const Vec2f& tex_coord)
+{
+    assert(format.vertex_layout == EVertexLayout::P3T2);
+    vertices.emplace_back(position.x());
+    vertices.emplace_back(position.y());
+    vertices.emplace_back(position.z());
+    vertices.emplace_back(tex_coord.x());
+    vertices.emplace_back(tex_coord.y());
+}
+
 void GLModel::Geometry::add_vertex(const Vec3f& position, const Vec3f& normal)
 {
     assert(format.vertex_layout == EVertexLayout::P3N3);
@@ -228,6 +248,7 @@ size_t GLModel::Geometry::vertex_stride_floats(const Format& format)
     case EVertexLayout::P2:   { return 2; }
     case EVertexLayout::P2T2: { return 4; }
     case EVertexLayout::P3:   { return 3; }
+    case EVertexLayout::P3T2: { return 5; }
     case EVertexLayout::P3N3: { return 6; }
     default:                  { assert(false); return 0; }
     };
@@ -240,6 +261,7 @@ size_t GLModel::Geometry::position_stride_floats(const Format& format)
     case EVertexLayout::P2:
     case EVertexLayout::P2T2: { return 2; }
     case EVertexLayout::P3:
+    case EVertexLayout::P3T2:
     case EVertexLayout::P3N3: { return 3; }
     default:                  { assert(false); return 0; }
     };
@@ -252,6 +274,7 @@ size_t GLModel::Geometry::position_offset_floats(const Format& format)
     case EVertexLayout::P2:
     case EVertexLayout::P2T2:
     case EVertexLayout::P3:
+    case EVertexLayout::P3T2:
     case EVertexLayout::P3N3: { return 0; }
     default:                  { assert(false); return 0; }
     };
@@ -279,7 +302,8 @@ size_t GLModel::Geometry::tex_coord_stride_floats(const Format& format)
 {
     switch (format.vertex_layout)
     {
-    case EVertexLayout::P2T2: { return 2; }
+    case EVertexLayout::P2T2:
+    case EVertexLayout::P3T2: { return 2; }
     default:                  { assert(false); return 0; }
     };
 }
@@ -289,6 +313,7 @@ size_t GLModel::Geometry::tex_coord_offset_floats(const Format& format)
     switch (format.vertex_layout)
     {
     case EVertexLayout::P2T2: { return 2; }
+    case EVertexLayout::P3T2: { return 3; }
     default:                  { assert(false); return 0; }
     };
 }
@@ -310,6 +335,7 @@ bool GLModel::Geometry::has_position(const Format& format)
     case EVertexLayout::P2:
     case EVertexLayout::P2T2:
     case EVertexLayout::P3:
+    case EVertexLayout::P3T2:
     case EVertexLayout::P3N3: { return true; }
     default:                  { assert(false); return false; }
     };
@@ -321,7 +347,8 @@ bool GLModel::Geometry::has_normal(const Format& format)
     {
     case EVertexLayout::P2:
     case EVertexLayout::P2T2:
-    case EVertexLayout::P3:   { return false; }
+    case EVertexLayout::P3:
+    case EVertexLayout::P3T2: { return false; }
     case EVertexLayout::P3N3: { return true; }
     default:                  { assert(false); return false; }
     };
@@ -331,7 +358,8 @@ bool GLModel::Geometry::has_tex_coord(const Format& format)
 {
     switch (format.vertex_layout)
     {
-    case EVertexLayout::P2T2: { return true; }
+    case EVertexLayout::P2T2:
+    case EVertexLayout::P3T2: { return true; }
     case EVertexLayout::P2:
     case EVertexLayout::P3:
     case EVertexLayout::P3N3: { return false; }
@@ -452,8 +480,8 @@ void GLModel::init_from(const indexed_triangle_set& its, const BoundingBoxf3 &bb
 
     Geometry& data = m_render_data.geometry;
     data.format = { Geometry::EPrimitiveType::Triangles, Geometry::EVertexLayout::P3N3, Geometry::EIndexType::UINT };
-    data.vertices.reserve(3 * its.indices.size() * Geometry::vertex_stride_floats(data.format));
-    data.indices.reserve(3 * its.indices.size() * Geometry::index_stride_bytes(data.format));
+    data.reserve_vertices(3 * its.indices.size());
+    data.reserve_indices(3 * its.indices.size());
 
     // vertices + indices
     unsigned int vertices_counter = 0;
@@ -534,8 +562,8 @@ void GLModel::init_from(const Polygons& polygons, float z)
         segments_count += polygon.points.size();
     }
 
-    data.vertices.reserve(2 * segments_count * Geometry::vertex_stride_floats(data.format));
-    data.indices.reserve(2 * segments_count * Geometry::index_stride_bytes(data.format));
+    data.reserve_vertices(2 * segments_count);
+    data.reserve_indices(2 * segments_count);
 
     // vertices + indices
     unsigned int vertices_counter = 0;
@@ -702,8 +730,8 @@ void GLModel::render() const
 
     const Geometry& data = m_render_data.geometry;
 
-    GLenum mode = get_primitive_mode(data.format);
-    GLenum index_type = get_index_type(data.format);
+    const GLenum mode = get_primitive_mode(data.format);
+    const GLenum index_type = get_index_type(data.format);
 
     const size_t vertex_stride_bytes = Geometry::vertex_stride_bytes(data.format);
     const bool position  = Geometry::has_position(data.format);
@@ -1016,8 +1044,8 @@ GLModel::Geometry stilized_arrow(unsigned short resolution, float tip_radius, fl
     GLModel::Geometry data;
 #if ENABLE_GLBEGIN_GLEND_REMOVAL
     data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3N3, GLModel::Geometry::EIndexType::USHORT };
-    data.vertices.reserve((6 * resolution + 2) * GLModel::Geometry::vertex_stride_floats(data.format));
-    data.indices.reserve((6 * resolution * 3) * GLModel::Geometry::index_stride_bytes(data.format));
+    data.reserve_vertices(6 * resolution + 2);
+    data.reserve_indices(6 * resolution * 3);
 #else
     GLModel::Geometry::Entity entity;
     entity.type = GLModel::EPrimitiveType::Triangles;
@@ -1157,6 +1185,7 @@ GLModel::Geometry stilized_arrow(unsigned short resolution, float tip_radius, fl
 
     data.entities.emplace_back(entity);
 #endif // ENABLE_GLBEGIN_GLEND_REMOVAL
+
     return data;
 }
 
@@ -1182,8 +1211,8 @@ GLModel::Geometry circular_arrow(unsigned short resolution, float radius, float
     GLModel::Geometry data;
 #if ENABLE_GLBEGIN_GLEND_REMOVAL
     data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3N3, GLModel::Geometry::EIndexType::USHORT };
-    data.vertices.reserve((8 * (resolution + 1) + 30) * GLModel::Geometry::vertex_stride_floats(data.format));
-    data.indices.reserve(((8 * resolution + 16) * 3) * GLModel::Geometry::index_stride_bytes(data.format));
+    data.reserve_vertices(8 * (resolution + 1) + 30);
+    data.reserve_indices((8 * resolution + 16) * 3);
 #else
     GLModel::Geometry::Entity entity;
     entity.type = GLModel::EPrimitiveType::Triangles;
@@ -1488,6 +1517,7 @@ GLModel::Geometry circular_arrow(unsigned short resolution, float radius, float
 
     data.entities.emplace_back(entity);
 #endif // ENABLE_GLBEGIN_GLEND_REMOVAL
+
     return data;
 }
 
@@ -1508,8 +1538,8 @@ GLModel::Geometry straight_arrow(float tip_width, float tip_height, float stem_w
     GLModel::Geometry data;
 #if ENABLE_GLBEGIN_GLEND_REMOVAL
     data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3N3, GLModel::Geometry::EIndexType::USHORT };
-    data.vertices.reserve(42 * GLModel::Geometry::vertex_stride_floats(data.format));
-    data.indices.reserve((24 * 3) * GLModel::Geometry::index_stride_bytes(data.format));
+    data.reserve_vertices(42);
+    data.reserve_indices(72);
 #else
     GLModel::Geometry::Entity entity;
     entity.type = GLModel::EPrimitiveType::Triangles;
@@ -1681,6 +1711,7 @@ GLModel::Geometry straight_arrow(float tip_width, float tip_height, float stem_w
 
     data.entities.emplace_back(entity);
 #endif // ENABLE_GLBEGIN_GLEND_REMOVAL
+
     return data;
 }
 
@@ -1694,8 +1725,8 @@ GLModel::Geometry diamond(unsigned short resolution)
     GLModel::Geometry data;
 #if ENABLE_GLBEGIN_GLEND_REMOVAL
     data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3N3, GLModel::Geometry::EIndexType::USHORT };
-    data.vertices.reserve((resolution + 2) * GLModel::Geometry::vertex_stride_floats(data.format));
-    data.indices.reserve(((2 * (resolution + 1)) * 3) * GLModel::Geometry::index_stride_bytes(data.format));
+    data.reserve_vertices(resolution + 2);
+    data.reserve_indices((2 * (resolution + 1)) * 3);
 #else
     GLModel::Geometry::Entity entity;
     entity.type = GLModel::EPrimitiveType::Triangles;
@@ -1706,7 +1737,7 @@ GLModel::Geometry diamond(unsigned short resolution)
 #if ENABLE_GLBEGIN_GLEND_REMOVAL
     // vertices
     for (unsigned short i = 0; i < resolution; ++i) {
-        float ii = float(i) * step;
+        const float ii = float(i) * step;
         const Vec3f p = { 0.5f * ::cos(ii), 0.5f * ::sin(ii), 0.0f };
         append_vertex(data, p, p.normalized());
     }
@@ -1764,8 +1795,77 @@ GLModel::Geometry diamond(unsigned short resolution)
 
     data.entities.emplace_back(entity);
 #endif // ENABLE_GLBEGIN_GLEND_REMOVAL
+
     return data;
 }
 
+#if ENABLE_GLBEGIN_GLEND_REMOVAL
+#if ENABLE_SHOW_TOOLPATHS_COG
+GLModel::Geometry smooth_sphere(unsigned short resolution, float radius)
+{
+    resolution = std::max<unsigned short>(4, resolution);
+    resolution = std::min<unsigned short>(256, resolution); // ensure no unsigned short overflow of indices
+
+    const unsigned short sectorCount = /*2 **/ resolution;
+    const unsigned short stackCount = resolution;
+
+    const float sectorStep = float(2.0 * M_PI / sectorCount);
+    const float stackStep = float(M_PI / stackCount);
+
+    GLModel::Geometry data;
+    data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3N3, GLModel::Geometry::EIndexType::USHORT };
+    data.reserve_vertices((stackCount - 1) * sectorCount + 2);
+    data.reserve_indices((2 * (stackCount - 1) * sectorCount) * 3);
+
+    // vertices
+    for (unsigned short i = 0; i <= stackCount; ++i) {
+        // from pi/2 to -pi/2
+        const double stackAngle = 0.5 * M_PI - stackStep * i;
+        const double xy = double(radius) * ::cos(stackAngle);
+        const double z = double(radius) * ::sin(stackAngle);
+        if (i == 0 || i == stackCount) {
+            const Vec3f v(float(xy), 0.0f, float(z));
+            data.add_vertex(v, (Vec3f)v.normalized());
+        }
+        else {
+            for (unsigned short j = 0; j < sectorCount; ++j) {
+                // from 0 to 2pi
+                const double sectorAngle = sectorStep * j;
+                const Vec3f v(float(xy * std::cos(sectorAngle)), float(xy * std::sin(sectorAngle)), float(z));
+                data.add_vertex(v, (Vec3f)v.normalized());
+            }
+        }
+    }
+
+    // triangles
+    for (unsigned short i = 0; i < stackCount; ++i) {
+        // Beginning of current stack.
+        unsigned short k1 = (i == 0) ? 0 : (1 + (i - 1) * sectorCount);
+        const unsigned short k1_first = k1;
+        // Beginning of next stack.
+        unsigned short k2 = (i == 0) ? 1 : (k1 + sectorCount);
+        const unsigned short k2_first = k2;
+        for (unsigned short j = 0; j < sectorCount; ++j) {
+            // 2 triangles per sector excluding first and last stacks
+            unsigned short k1_next = k1;
+            unsigned short k2_next = k2;
+            if (i != 0) {
+                k1_next = (j + 1 == sectorCount) ? k1_first : (k1 + 1);
+                data.add_ushort_triangle(k1, k2, k1_next);
+            }
+            if (i + 1 != stackCount) {
+                k2_next = (j + 1 == sectorCount) ? k2_first : (k2 + 1);
+                data.add_ushort_triangle(k1_next, k2, k2_next);
+            }
+            k1 = k1_next;
+            k2 = k2_next;
+        }
+    }
+
+    return data;
+}
+#endif // ENABLE_SHOW_TOOLPATHS_COG
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
+
 } // namespace GUI
 } // namespace Slic3r
diff --git a/src/slic3r/GUI/GLModel.hpp b/src/slic3r/GUI/GLModel.hpp
index 61456f377..70220a75c 100644
--- a/src/slic3r/GUI/GLModel.hpp
+++ b/src/slic3r/GUI/GLModel.hpp
@@ -58,6 +58,7 @@ namespace GUI {
                 P2,   // position 2 floats
                 P2T2, // position 2 floats + texture coords 2 floats
                 P3,   // position 3 floats
+                P3T2, // position 3 floats + texture coords 2 floats
                 P3N3, // position 3 floats + normal 3 floats
             };
 
@@ -79,9 +80,13 @@ namespace GUI {
             std::vector<unsigned char> indices;
             ColorRGBA color{ ColorRGBA::BLACK() };
 
+            void reserve_vertices(size_t vertices_count);
+            void reserve_indices(size_t indices_count);
+
             void add_vertex(const Vec2f& position);
             void add_vertex(const Vec2f& position, const Vec2f& tex_coord);
             void add_vertex(const Vec3f& position);
+            void add_vertex(const Vec3f& position, const Vec2f& tex_coord);
             void add_vertex(const Vec3f& position, const Vec3f& normal);
 
             void add_ushort_index(unsigned short id);
@@ -101,6 +106,8 @@ namespace GUI {
             unsigned int extract_uint_index(size_t id) const;
             unsigned short extract_ushort_index(size_t id) const;
 
+            bool is_empty() const { return vertices.empty() || indices.empty(); }
+
             size_t vertices_count() const { return vertices.size() / vertex_stride_floats(format); }
             size_t indices_count() const  { return indices.size() / index_stride_bytes(format); }
 
@@ -254,6 +261,14 @@ namespace GUI {
     // the diamond is contained into a box with size [1, 1, 1]
     GLModel::Geometry diamond(unsigned short resolution);
 
+#if ENABLE_GLBEGIN_GLEND_REMOVAL
+#if ENABLE_SHOW_TOOLPATHS_COG
+    // create a sphere with the given resolution and smooth normals
+    // the origin of the sphere is in its center
+    GLModel::Geometry smooth_sphere(unsigned short resolution, float radius);
+#endif // ENABLE_SHOW_TOOLPATHS_COG
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
+
 } // namespace GUI
 } // namespace Slic3r
 
diff --git a/src/slic3r/GUI/GLSelectionRectangle.cpp b/src/slic3r/GUI/GLSelectionRectangle.cpp
index 7991caaba..2a3d73d7f 100644
--- a/src/slic3r/GUI/GLSelectionRectangle.cpp
+++ b/src/slic3r/GUI/GLSelectionRectangle.cpp
@@ -115,8 +115,8 @@ namespace GUI {
 
                 GLModel::Geometry init_data;
                 init_data.format = { GLModel::Geometry::EPrimitiveType::LineLoop, GLModel::Geometry::EVertexLayout::P2, GLModel::Geometry::EIndexType::USHORT };
-                init_data.vertices.reserve(4 * GLModel::Geometry::vertex_stride_floats(init_data.format));
-                init_data.indices.reserve(4 * GLModel::Geometry::index_stride_bytes(init_data.format));
+                init_data.reserve_vertices(4);
+                init_data.reserve_indices(4);
 
                 // vertices
                 init_data.add_vertex(Vec2f(left, bottom));
diff --git a/src/slic3r/GUI/GLShadersManager.cpp b/src/slic3r/GUI/GLShadersManager.cpp
index ae71e90af..33ac9b6bc 100644
--- a/src/slic3r/GUI/GLShadersManager.cpp
+++ b/src/slic3r/GUI/GLShadersManager.cpp
@@ -41,6 +41,10 @@ std::pair<bool, std::string> GLShadersManager::init()
     // used to render 3D scene background
     valid &= append_shader("background", { "background.vs", "background.fs" });
 #endif // ENABLE_GLBEGIN_GLEND_REMOVAL
+#if ENABLE_SHOW_TOOLPATHS_COG
+    // used to render toolpaths center of gravity
+    valid &= append_shader("toolpaths_cog", { "toolpaths_cog.vs", "toolpaths_cog.fs" });
+#endif // ENABLE_SHOW_TOOLPATHS_COG
     // used to render bed axes and model, selection hints, gcode sequential view marker model, preview shells, options in gcode preview
     valid &= append_shader("gouraud_light", { "gouraud_light.vs", "gouraud_light.fs" });
     // used to render printbed
diff --git a/src/slic3r/GUI/GLTexture.cpp b/src/slic3r/GUI/GLTexture.cpp
index 3b99397ad..340bb78c3 100644
--- a/src/slic3r/GUI/GLTexture.cpp
+++ b/src/slic3r/GUI/GLTexture.cpp
@@ -342,8 +342,8 @@ void GLTexture::render_sub_texture(unsigned int tex_id, float left, float right,
 #if ENABLE_GLBEGIN_GLEND_REMOVAL
     GLModel::Geometry init_data;
     init_data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P2T2, GLModel::Geometry::EIndexType::USHORT };
-    init_data.vertices.reserve(4 * GLModel::Geometry::vertex_stride_floats(init_data.format));
-    init_data.indices.reserve(6 * GLModel::Geometry::index_stride_bytes(init_data.format));
+    init_data.reserve_vertices(4);
+    init_data.reserve_indices(6);
 
     // vertices
     init_data.add_vertex(Vec2f(left, bottom),  Vec2f(uvs.left_bottom.u, uvs.left_bottom.v));
diff --git a/src/slic3r/GUI/GUI_App.cpp b/src/slic3r/GUI/GUI_App.cpp
index 3326547bb..27dcaa225 100644
--- a/src/slic3r/GUI/GUI_App.cpp
+++ b/src/slic3r/GUI/GUI_App.cpp
@@ -872,8 +872,8 @@ void GUI_App::init_app_config()
 {
 	// Profiles for the alpha are stored into the PrusaSlicer-alpha directory to not mix with the current release.
 //    SetAppName(SLIC3R_APP_KEY);
-//	SetAppName(SLIC3R_APP_KEY "-alpha");
-    SetAppName(SLIC3R_APP_KEY "-beta");
+	SetAppName(SLIC3R_APP_KEY "-alpha");
+//    SetAppName(SLIC3R_APP_KEY "-beta");
 //	SetAppDisplayName(SLIC3R_APP_NAME);
 
 	// Set the Slic3r data directory at the Slic3r XS module.
diff --git a/src/slic3r/GUI/GUI_ObjectList.cpp b/src/slic3r/GUI/GUI_ObjectList.cpp
index a8f61d58f..04685e7cc 100644
--- a/src/slic3r/GUI/GUI_ObjectList.cpp
+++ b/src/slic3r/GUI/GUI_ObjectList.cpp
@@ -1706,16 +1706,16 @@ void ObjectList::load_shape_object(const std::string& type_name)
     if (selection.get_object_idx() != -1)
         return;
 
-    const int obj_idx = m_objects->size();
-    if (obj_idx < 0)
-        return;
-
     take_snapshot(_L("Add Shape"));
 
     // Create mesh
     BoundingBoxf3 bb;
     TriangleMesh mesh = create_mesh(type_name, bb);
     load_mesh_object(mesh, _L("Shape") + "-" + _(type_name));
+#if ENABLE_RELOAD_FROM_DISK_REWORK
+    if (!m_objects->empty())
+        m_objects->back()->volumes.front()->source.is_from_builtin_objects = true;
+#endif // ENABLE_RELOAD_FROM_DISK_REWORK
     wxGetApp().mainframe->update_title();
 }
 
diff --git a/src/slic3r/GUI/GUI_ObjectManipulation.cpp b/src/slic3r/GUI/GUI_ObjectManipulation.cpp
index 4ee7882d2..69e41e806 100644
--- a/src/slic3r/GUI/GUI_ObjectManipulation.cpp
+++ b/src/slic3r/GUI/GUI_ObjectManipulation.cpp
@@ -1438,8 +1438,8 @@ ManipulationEditor::ManipulationEditor(ObjectManipulation* parent,
         parent->set_focused_editor(nullptr);
 
 #if ENABLE_OBJECT_MANIPULATOR_FOCUS
-        // if the widget loosing focus is not a manipulator field, call kill_focus
-        if (dynamic_cast<ManipulationEditor*>(e.GetWindow()) == nullptr)
+        // if the widgets exchanging focus are both manipulator fields, call kill_focus
+        if (dynamic_cast<ManipulationEditor*>(e.GetEventObject()) != nullptr && dynamic_cast<ManipulationEditor*>(e.GetWindow()) != nullptr)
 #else
         if (!m_enter_pressed)
 #endif // ENABLE_OBJECT_MANIPULATOR_FOCUS
diff --git a/src/slic3r/GUI/GUI_Preview.hpp b/src/slic3r/GUI/GUI_Preview.hpp
index d9c32e829..97f8edde3 100644
--- a/src/slic3r/GUI/GUI_Preview.hpp
+++ b/src/slic3r/GUI/GUI_Preview.hpp
@@ -126,6 +126,9 @@ public:
         ColorChanges,
         PausePrints,
         CustomGCodes,
+#if ENABLE_SHOW_TOOLPATHS_COG
+        CenterOfGravity,
+#endif // ENABLE_SHOW_TOOLPATHS_COG
         Shells,
         ToolMarker,
 #if !ENABLE_PREVIEW_LAYOUT
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoCut.cpp b/src/slic3r/GUI/Gizmos/GLGizmoCut.cpp
index ab29e9026..ff5d89f5e 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoCut.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoCut.cpp
@@ -115,8 +115,8 @@ void GLGizmoCut::on_render()
             GLModel::Geometry init_data;
             init_data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3, GLModel::Geometry::EIndexType::USHORT };
             init_data.color  = { 0.8f, 0.8f, 0.8f, 0.5f };
-            init_data.vertices.reserve(4 * GLModel::Geometry::vertex_stride_floats(init_data.format));
-            init_data.indices.reserve(6 * GLModel::Geometry::index_stride_bytes(init_data.format));
+            init_data.reserve_vertices(4);
+            init_data.reserve_indices(6);
 
             // vertices
             init_data.add_vertex(Vec3f(min_x, min_y, plane_center.z()));
@@ -160,8 +160,8 @@ void GLGizmoCut::on_render()
             GLModel::Geometry init_data;
             init_data.format = { GLModel::Geometry::EPrimitiveType::Lines, GLModel::Geometry::EVertexLayout::P3, GLModel::Geometry::EIndexType::USHORT };
             init_data.color  = ColorRGBA::YELLOW();
-            init_data.vertices.reserve(2 * GLModel::Geometry::vertex_stride_floats(init_data.format));
-            init_data.indices.reserve(2 * GLModel::Geometry::index_stride_bytes(init_data.format));
+            init_data.reserve_vertices(2);
+            init_data.reserve_indices(2);
 
             // vertices
             init_data.add_vertex((Vec3f)plane_center.cast<float>());
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoEmboss.cpp b/src/slic3r/GUI/Gizmos/GLGizmoEmboss.cpp
index e40996c36..8e22b923c 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoEmboss.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoEmboss.cpp
@@ -1301,23 +1301,39 @@ void GLGizmoEmboss::draw_advanced()
                          *font_prop.distance : .0f;
     ImGui::SetNextItemWidth(item_width);
     if (m_imgui->slider_optional_float(_u8L("Surface distance").c_str(), font_prop.distance,
-        -font_prop.emboss, font_prop.emboss, "%.2f mm", 1.f, false, _L("Distance from model surface"))) {
+        -2*font_prop.emboss, 2*font_prop.emboss, "%.2f mm", 1.f, false, _L("Distance from model surface"))) {
         float act_distance = font_prop.distance.has_value() ?
                             *font_prop.distance : .0f;
-        float diff         = prev_distance - act_distance;
+        float diff = prev_distance - act_distance;
+        Vec3d displacement_rot = Vec3d::UnitZ() * diff;
 
-        // move with volume by diff size in volume z
-        Vec3d r = m_volume->get_rotation();
-        Eigen::Matrix3d rot_mat =
-            (Eigen::AngleAxisd(r.z(), Vec3d::UnitZ()) *
-            Eigen::AngleAxisd(r.y(), Vec3d::UnitY()) *
-            Eigen::AngleAxisd(r.x(), Vec3d::UnitX())).toRotationMatrix();
-        Vec3d displacement_rot = rot_mat * (Vec3d::UnitZ() * diff);
-        m_volume->translate(displacement_rot);
-        m_volume->set_new_unique_id();
-        /*Selection &s = m_parent.get_selection();
-        const GLVolume *v = s.get_volume(*s.get_volume_idxs().begin());
-        s.translate(v->get_volume_offset() + displacement_rot*diff, ECoordinatesType::Local);*/
+        Selection &selection = m_parent.get_selection();
+        selection.start_dragging();
+        selection.translate(displacement_rot, ECoordinatesType::Local);
+        selection.stop_dragging();
+
+        std::string snapshot_name; // empty meand no store undo / redo
+        // NOTE: it use L instead of _L macro because prefix _ is appended inside function do_move
+        //snapshot_name = L("Set surface distance");
+        m_parent.do_move(snapshot_name);
+    }
+
+    float prev_angle = font_prop.angle.has_value() ? *font_prop.angle : .0f;
+    ImGui::SetNextItemWidth(item_width);
+    if (m_imgui->slider_optional_float(_u8L("Angle").c_str(), font_prop.angle,
+        -180.f, 180.f, u8"%.2f °", 1.f, false, _L("Rotation of text"))) {
+        float act_angle = font_prop.angle.has_value() ? *font_prop.angle : .0f;
+        float diff = prev_angle - act_angle;
+
+        Selection &selection = m_parent.get_selection();
+        selection.start_dragging();
+        selection.rotate(Vec3d(0., 0., M_PI / 180.0 * diff), TransformationType::Local);
+        selection.stop_dragging();
+
+        std::string snapshot_name; // empty meand no store undo / redo
+        // NOTE: it use L instead of _L macro because prefix _ is appended inside function do_move
+        //snapshot_name = L("Set surface distance");
+        m_parent.do_rotate(snapshot_name);
     }
 
     // when more collection add selector
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoFlatten.cpp b/src/slic3r/GUI/Gizmos/GLGizmoFlatten.cpp
index fd32c68fc..0956a9047 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoFlatten.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoFlatten.cpp
@@ -1,6 +1,9 @@
 // Include GLGizmoBase.hpp before I18N.hpp as it includes some libigl code, which overrides our localization "L" macro.
 #include "GLGizmoFlatten.hpp"
 #include "slic3r/GUI/GLCanvas3D.hpp"
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+#include "slic3r/GUI/GUI_App.hpp"
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
 #include "slic3r/GUI/Gizmos/GLGizmosCommon.hpp"
 
 #include "libslic3r/Geometry/ConvexHull.hpp"
@@ -63,6 +66,14 @@ void GLGizmoFlatten::on_render()
 {
     const Selection& selection = m_parent.get_selection();
 
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+    GLShaderProgram* shader = wxGetApp().get_shader("flat");
+    if (shader == nullptr)
+        return;
+    
+    shader->start_using();
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+
     glsafe(::glClear(GL_DEPTH_BUFFER_BIT));
 
     glsafe(::glEnable(GL_DEPTH_TEST));
@@ -76,21 +87,38 @@ void GLGizmoFlatten::on_render()
         if (this->is_plane_update_necessary())
             update_planes();
         for (int i = 0; i < (int)m_planes.size(); ++i) {
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+            m_planes[i].vbo.set_color(i == m_hover_id ? DEFAULT_HOVER_PLANE_COLOR : DEFAULT_PLANE_COLOR);
+            m_planes[i].vbo.render();
+#else
             glsafe(::glColor4fv(i == m_hover_id ? DEFAULT_HOVER_PLANE_COLOR.data() : DEFAULT_PLANE_COLOR.data()));
             if (m_planes[i].vbo.has_VBOs())
                 m_planes[i].vbo.render();
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
         }
         glsafe(::glPopMatrix());
     }
 
     glsafe(::glEnable(GL_CULL_FACE));
     glsafe(::glDisable(GL_BLEND));
+
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+    shader->stop_using();
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
 }
 
 void GLGizmoFlatten::on_render_for_picking()
 {
     const Selection& selection = m_parent.get_selection();
 
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+    GLShaderProgram* shader = wxGetApp().get_shader("flat");
+    if (shader == nullptr)
+        return;
+
+    shader->start_using();
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+
     glsafe(::glDisable(GL_DEPTH_TEST));
     glsafe(::glDisable(GL_BLEND));
 
@@ -102,13 +130,21 @@ void GLGizmoFlatten::on_render_for_picking()
         if (this->is_plane_update_necessary())
             update_planes();
         for (int i = 0; i < (int)m_planes.size(); ++i) {
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+            m_planes[i].vbo.set_color(picking_color_component(i));
+#else
             glsafe(::glColor4fv(picking_color_component(i).data()));
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
             m_planes[i].vbo.render();
         }
         glsafe(::glPopMatrix());
     }
 
     glsafe(::glEnable(GL_CULL_FACE));
+
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+    shader->stop_using();
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
 }
 
 void GLGizmoFlatten::set_flattening_data(const ModelObject* model_object)
@@ -324,12 +360,29 @@ void GLGizmoFlatten::update_planes()
     // And finally create respective VBOs. The polygon is convex with
     // the vertices in order, so triangulation is trivial.
     for (auto& plane : m_planes) {
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+        GLModel::Geometry init_data;
+        const GLModel::Geometry::EIndexType index_type = (plane.vertices.size() < 65536) ? GLModel::Geometry::EIndexType::USHORT : GLModel::Geometry::EIndexType::UINT;
+        init_data.format = { GLModel::Geometry::EPrimitiveType::TriangleFan, GLModel::Geometry::EVertexLayout::P3N3, index_type };
+        init_data.reserve_vertices(plane.vertices.size());
+        init_data.reserve_indices(plane.vertices.size());
+        // vertices + indices
+        for (size_t i = 0; i < plane.vertices.size(); ++i) {
+            init_data.add_vertex((Vec3f)plane.vertices[i].cast<float>(), (Vec3f)plane.normal.cast<float>());
+            if (index_type == GLModel::Geometry::EIndexType::USHORT)
+                init_data.add_ushort_index((unsigned short)i);
+            else
+                init_data.add_uint_index((unsigned int)i);
+        }
+        plane.vbo.init_from(std::move(init_data));
+#else
         plane.vbo.reserve(plane.vertices.size());
         for (const auto& vert : plane.vertices)
             plane.vbo.push_geometry(vert, plane.normal);
         for (size_t i=1; i<plane.vertices.size()-1; ++i)
             plane.vbo.push_triangle(0, i, i+1); // triangle fan
         plane.vbo.finalize_geometry(true);
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
         // FIXME: vertices should really be local, they need not
         // persist now when we use VBOs
         plane.vertices.clear();
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoFlatten.hpp b/src/slic3r/GUI/Gizmos/GLGizmoFlatten.hpp
index ab3c2c7ba..3a3a90434 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoFlatten.hpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoFlatten.hpp
@@ -2,7 +2,11 @@
 #define slic3r_GLGizmoFlatten_hpp_
 
 #include "GLGizmoBase.hpp"
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+#include "slic3r/GUI/GLModel.hpp"
+#else
 #include "slic3r/GUI/3DScene.hpp"
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
 
 
 namespace Slic3r {
@@ -22,7 +26,11 @@ private:
 
     struct PlaneData {
         std::vector<Vec3d> vertices; // should be in fact local in update_planes()
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+        GLModel vbo;
+#else
         GLIndexedVertexArray vbo;
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
         Vec3d normal;
         float area;
     };
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoMmuSegmentation.cpp b/src/slic3r/GUI/Gizmos/GLGizmoMmuSegmentation.cpp
index 4c204d0d4..dd9cf0de2 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoMmuSegmentation.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoMmuSegmentation.cpp
@@ -589,6 +589,9 @@ void TriangleSelectorMmGui::render(ImGuiWrapper *imgui)
             m_gizmo_scene.render(color_idx);
         }
 
+#if ENABLE_GLBEGIN_GLEND_REMOVAL
+    render_paint_contour();
+#else
     if (m_paint_contour.has_VBO()) {
         ScopeGuard guard_mm_gouraud([shader]() { shader->start_using(); });
         shader->stop_using();
@@ -602,6 +605,7 @@ void TriangleSelectorMmGui::render(ImGuiWrapper *imgui)
 
         contour_shader->stop_using();
     }
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
 
     m_update_render_data = false;
 }
@@ -636,6 +640,9 @@ void TriangleSelectorMmGui::update_render_data()
 
     m_gizmo_scene.finalize_triangle_indices();
 
+#if ENABLE_GLBEGIN_GLEND_REMOVAL
+    update_paint_contour();
+#else
     m_paint_contour.release_geometry();
     std::vector<Vec2i> contour_edges = this->get_seed_fill_contour();
     m_paint_contour.contour_vertices.reserve(contour_edges.size() * 6);
@@ -654,6 +661,7 @@ void TriangleSelectorMmGui::update_render_data()
     m_paint_contour.contour_indices_size = m_paint_contour.contour_indices.size();
 
     m_paint_contour.finalize_geometry();
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
 }
 
 wxString GLGizmoMmuSegmentation::handle_snapshot_action_name(bool shift_down, GLGizmoPainterBase::Button button_down) const
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoMove.cpp b/src/slic3r/GUI/Gizmos/GLGizmoMove.cpp
index 522493597..1d8548bda 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoMove.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoMove.cpp
@@ -117,8 +117,8 @@ void GLGizmoMove3D::on_render()
                 GLModel::Geometry init_data;
                 init_data.format = { GLModel::Geometry::EPrimitiveType::Lines, GLModel::Geometry::EVertexLayout::P3, GLModel::Geometry::EIndexType::USHORT };
                 init_data.color = AXES_COLOR[id];
-                init_data.vertices.reserve(2 * GLModel::Geometry::vertex_stride_floats(init_data.format));
-                init_data.indices.reserve(2 * GLModel::Geometry::index_stride_bytes(init_data.format));
+                init_data.reserve_vertices(2);
+                init_data.reserve_indices(2);
 
                 // vertices
                 init_data.add_vertex((Vec3f)center.cast<float>());
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.cpp b/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.cpp
index 4c76767bd..0fc57c909 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.cpp
@@ -18,7 +18,11 @@
 
 namespace Slic3r::GUI {
 
-    std::shared_ptr<GLIndexedVertexArray> GLGizmoPainterBase::s_sphere = nullptr;
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+std::shared_ptr<GLModel> GLGizmoPainterBase::s_sphere = nullptr;
+#else
+std::shared_ptr<GLIndexedVertexArray> GLGizmoPainterBase::s_sphere = nullptr;
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
 
 GLGizmoPainterBase::GLGizmoPainterBase(GLCanvas3D& parent, const std::string& icon_filename, unsigned int sprite_id)
     : GLGizmoBase(parent, icon_filename, sprite_id)
@@ -27,8 +31,13 @@ GLGizmoPainterBase::GLGizmoPainterBase(GLCanvas3D& parent, const std::string& ic
 
 GLGizmoPainterBase::~GLGizmoPainterBase()
 {
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+    if (s_sphere != nullptr)
+        s_sphere.reset();
+#else
     if (s_sphere != nullptr && s_sphere->has_VBOs())
         s_sphere->release_geometry();
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
 }
 
 void GLGizmoPainterBase::set_painter_gizmo_data(const Selection& selection)
@@ -185,8 +194,8 @@ void GLGizmoPainterBase::render_cursor_circle()
         static const float StepSize = 2.0f * float(PI) / float(StepsCount);
         init_data.format = { GLModel::Geometry::EPrimitiveType::LineLoop, GLModel::Geometry::EVertexLayout::P3, GLModel::Geometry::EIndexType::USHORT };
         init_data.color  = { 0.0f, 1.0f, 0.3f, 1.0f };
-        init_data.vertices.reserve(StepsCount * GLModel::Geometry::vertex_stride_floats(init_data.format));
-        init_data.indices.reserve(StepsCount * GLModel::Geometry::index_stride_bytes(init_data.format));
+        init_data.reserve_vertices(StepsCount);
+        init_data.reserve_indices(StepsCount);
 
         // vertices + indices
         for (unsigned short i = 0; i < StepsCount; ++i) {
@@ -220,18 +229,27 @@ void GLGizmoPainterBase::render_cursor_circle()
 void GLGizmoPainterBase::render_cursor_sphere(const Transform3d& trafo) const
 {
     if (s_sphere == nullptr) {
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+        s_sphere = std::make_shared<GLModel>();
+        s_sphere->init_from(its_make_sphere(1.0, double(PI) / 12.0));
+#else
         s_sphere = std::make_shared<GLIndexedVertexArray>();
         s_sphere->load_its_flat_shading(its_make_sphere(1.0, double(PI) / 12.0));
         s_sphere->finalize_geometry(true);
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
     }
 
+    GLShaderProgram* shader = wxGetApp().get_shader("flat");
+    if (shader == nullptr)
+        return;
+
     const Transform3d complete_scaling_matrix_inverse = Geometry::Transformation(trafo).get_matrix(true, true, false, true).inverse();
     const bool is_left_handed = Geometry::Transformation(trafo).is_left_handed();
 
     glsafe(::glPushMatrix());
     glsafe(::glMultMatrixd(trafo.data()));
     // Inverse matrix of the instance scaling is applied so that the mark does not scale with the object.
-    glsafe(::glTranslatef(m_rr.hit(0), m_rr.hit(1), m_rr.hit(2)));
+    glsafe(::glTranslatef(m_rr.hit.x(), m_rr.hit.y(), m_rr.hit.z()));
     glsafe(::glMultMatrixd(complete_scaling_matrix_inverse.data()));
     glsafe(::glScaled(m_cursor_radius, m_cursor_radius, m_cursor_radius));
 
@@ -243,11 +261,22 @@ void GLGizmoPainterBase::render_cursor_sphere(const Transform3d& trafo) const
         render_color = this->get_cursor_sphere_left_button_color();
     else if (m_button_down == Button::Right)
         render_color = this->get_cursor_sphere_right_button_color();
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+    shader->start_using();
+
+    assert(s_sphere != nullptr);
+    s_sphere->set_color(render_color);
+#else
     glsafe(::glColor4fv(render_color.data()));
 
     assert(s_sphere != nullptr);
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
     s_sphere->render();
 
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+    shader->stop_using();
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+
     if (is_left_handed)
         glFrontFace(GL_CCW);
 
@@ -763,13 +792,28 @@ void TriangleSelectorGUI::render(ImGuiWrapper* imgui)
     shader->set_uniform("offset_depth_buffer", true);
     for (auto iva : {std::make_pair(&m_iva_enforcers, enforcers_color),
                      std::make_pair(&m_iva_blockers, blockers_color)}) {
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+        iva.first->set_color(iva.second);
+        iva.first->render();
+#else
         if (iva.first->has_VBOs()) {
             shader->set_uniform("uniform_color", iva.second);
             iva.first->render();
         }
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
     }
 
-    for (auto &iva : m_iva_seed_fills)
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+    for (auto& iva : m_iva_seed_fills) {
+        size_t           color_idx = &iva - &m_iva_seed_fills.front();
+        const ColorRGBA& color     = TriangleSelectorGUI::get_seed_fill_color(color_idx == 1 ? enforcers_color :
+            color_idx == 2 ? blockers_color :
+            GLVolume::NEUTRAL_COLOR);
+        iva.set_color(color);
+        iva.render();
+    }
+#else
+    for (auto& iva : m_iva_seed_fills)
         if (iva.has_VBOs()) {
             size_t                      color_idx = &iva - &m_iva_seed_fills.front();
             const ColorRGBA& color                = TriangleSelectorGUI::get_seed_fill_color(color_idx == 1 ? enforcers_color :
@@ -778,7 +822,11 @@ void TriangleSelectorGUI::render(ImGuiWrapper* imgui)
             shader->set_uniform("uniform_color", color);
             iva.render();
         }
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
 
+#if ENABLE_GLBEGIN_GLEND_REMOVAL
+    render_paint_contour();
+#else
     if (m_paint_contour.has_VBO()) {
         ScopeGuard guard_gouraud([shader]() { shader->start_using(); });
         shader->stop_using();
@@ -792,13 +840,14 @@ void TriangleSelectorGUI::render(ImGuiWrapper* imgui)
 
         contour_shader->stop_using();
     }
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
 
 #ifdef PRUSASLICER_TRIANGLE_SELECTOR_DEBUG
     if (imgui)
         render_debug(imgui);
     else
         assert(false); // If you want debug output, pass ptr to ImGuiWrapper.
-#endif
+#endif // PRUSASLICER_TRIANGLE_SELECTOR_DEBUG
 }
 
 void TriangleSelectorGUI::update_render_data()
@@ -807,20 +856,44 @@ void TriangleSelectorGUI::update_render_data()
     int              blc_cnt = 0;
     std::vector<int> seed_fill_cnt(m_iva_seed_fills.size(), 0);
 
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+    for (auto* iva : { &m_iva_enforcers, &m_iva_blockers }) {
+        iva->reset();
+    }
+
+    for (auto& iva : m_iva_seed_fills) {
+        iva.reset();
+    }
+
+    GLModel::Geometry iva_enforcers_data;
+    iva_enforcers_data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3N3, GLModel::Geometry::EIndexType::UINT };
+    GLModel::Geometry iva_blockers_data;
+    iva_blockers_data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3N3, GLModel::Geometry::EIndexType::UINT };
+    std::array<GLModel::Geometry, 3> iva_seed_fills_data;
+    for (auto& data : iva_seed_fills_data)
+        data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3N3, GLModel::Geometry::EIndexType::UINT };
+#else
     for (auto *iva : {&m_iva_enforcers, &m_iva_blockers})
         iva->release_geometry();
 
     for (auto &iva : m_iva_seed_fills)
         iva.release_geometry();
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
 
     for (const Triangle &tr : m_triangles) {
         if (!tr.valid() || tr.is_split() || (tr.get_state() == EnforcerBlockerType::NONE && !tr.is_selected_by_seed_fill()))
             continue;
 
         int tr_state = int(tr.get_state());
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+        GLModel::Geometry &iva = tr.is_selected_by_seed_fill()                   ? iva_seed_fills_data[tr_state] :
+                                 tr.get_state() == EnforcerBlockerType::ENFORCER ? iva_enforcers_data :
+                                                                                   iva_blockers_data;
+#else
         GLIndexedVertexArray &iva = tr.is_selected_by_seed_fill()                   ? m_iva_seed_fills[tr_state] :
                                     tr.get_state() == EnforcerBlockerType::ENFORCER ? m_iva_enforcers :
                                                                                       m_iva_blockers;
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
         int                  &cnt = tr.is_selected_by_seed_fill()                   ? seed_fill_cnt[tr_state] :
                                     tr.get_state() == EnforcerBlockerType::ENFORCER ? enf_cnt :
                                                                                       blc_cnt;
@@ -830,19 +903,40 @@ void TriangleSelectorGUI::update_render_data()
         //FIXME the normal may likely be pulled from m_triangle_selectors, but it may not be worth the effort
         // or the current implementation may be more cache friendly.
         const Vec3f           n   = (v1 - v0).cross(v2 - v1).normalized();
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+        iva.add_vertex(v0, n);
+        iva.add_vertex(v1, n);
+        iva.add_vertex(v2, n);
+        iva.add_uint_triangle((unsigned int)cnt, (unsigned int)cnt + 1, (unsigned int)cnt + 2);
+#else
         iva.push_geometry(v0, n);
         iva.push_geometry(v1, n);
         iva.push_geometry(v2, n);
         iva.push_triangle(cnt, cnt + 1, cnt + 2);
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
         cnt += 3;
     }
 
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+    if (!iva_enforcers_data.is_empty())
+        m_iva_enforcers.init_from(std::move(iva_enforcers_data));
+    if (!iva_blockers_data.is_empty())
+        m_iva_blockers.init_from(std::move(iva_blockers_data));
+    for (size_t i = 0; i < m_iva_seed_fills.size(); ++i) {
+        if (!iva_seed_fills_data[i].is_empty())
+            m_iva_seed_fills[i].init_from(std::move(iva_seed_fills_data[i]));
+    }
+#else
     for (auto *iva : {&m_iva_enforcers, &m_iva_blockers})
         iva->finalize_geometry(true);
 
     for (auto &iva : m_iva_seed_fills)
         iva.finalize_geometry(true);
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
 
+#if ENABLE_GLBEGIN_GLEND_REMOVAL
+    update_paint_contour();
+#else
     m_paint_contour.release_geometry();
     std::vector<Vec2i> contour_edges = this->get_seed_fill_contour();
     m_paint_contour.contour_vertices.reserve(contour_edges.size() * 6);
@@ -861,8 +955,10 @@ void TriangleSelectorGUI::update_render_data()
     m_paint_contour.contour_indices_size = m_paint_contour.contour_indices.size();
 
     m_paint_contour.finalize_geometry();
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
 }
 
+#if !ENABLE_GLBEGIN_GLEND_REMOVAL
 void GLPaintContour::render() const
 {
     assert(this->m_contour_VBO_id != 0);
@@ -920,6 +1016,7 @@ void GLPaintContour::release_geometry()
     }
     this->clear();
 }
+#endif // !ENABLE_GLBEGIN_GLEND_REMOVAL
 
 #ifdef PRUSASLICER_TRIANGLE_SELECTOR_DEBUG
 void TriangleSelectorGUI::render_debug(ImGuiWrapper* imgui)
@@ -956,45 +1053,111 @@ void TriangleSelectorGUI::render_debug(ImGuiWrapper* imgui)
         INVALID
     };
 
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+    for (auto& va : m_varrays)
+        va.reset();
+#else
     for (auto& va : m_varrays)
         va.release_geometry();
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
 
     std::array<int, 3> cnts;
 
     ::glScalef(1.01f, 1.01f, 1.01f);
 
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+    std::array<GLModel::Geometry, 3> varrays_data;
+    for (auto& data : varrays_data)
+        data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3N3, GLModel::Geometry::EIndexType::UINT };
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+
     for (int tr_id=0; tr_id<int(m_triangles.size()); ++tr_id) {
         const Triangle& tr = m_triangles[tr_id];
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+        GLModel::Geometry* va = nullptr;
+#else
         GLIndexedVertexArray* va = nullptr;
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
         int* cnt = nullptr;
         if (tr_id < m_orig_size_indices) {
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+            va = &varrays_data[ORIGINAL];
+#else
             va = &m_varrays[ORIGINAL];
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
             cnt = &cnts[ORIGINAL];
         }
         else if (tr.valid()) {
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+            va = &varrays_data[SPLIT];
+#else
             va = &m_varrays[SPLIT];
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
             cnt = &cnts[SPLIT];
         }
         else {
             if (! m_show_invalid)
                 continue;
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+            va = &varrays_data[INVALID];
+#else
             va = &m_varrays[INVALID];
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
             cnt = &cnts[INVALID];
         }
 
-        for (int i=0; i<3; ++i)
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+        for (int i = 0; i < 3; ++i) {
+            va->add_vertex(m_vertices[tr.verts_idxs[i]].v, Vec3f(0.0f, 0.0f, 1.0f));
+        }
+        va->add_uint_triangle((unsigned int)*cnt, (unsigned int)*cnt + 1, (unsigned int)*cnt + 2);
+#else
+        for (int i = 0; i < 3; ++i)
             va->push_geometry(double(m_vertices[tr.verts_idxs[i]].v[0]),
                               double(m_vertices[tr.verts_idxs[i]].v[1]),
                               double(m_vertices[tr.verts_idxs[i]].v[2]),
                               0., 0., 1.);
         va->push_triangle(*cnt,
-                          *cnt+1,
-                          *cnt+2);
+            *cnt + 1,
+            *cnt + 2);
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
         *cnt += 3;
     }
 
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+    for (int i = 0; i < 3; ++i) {
+        if (!varrays_data[i].is_empty())
+            m_varrays[i].init_from(std::move(varrays_data[i]));
+    }
+#else
+    for (auto* iva : { &m_iva_enforcers, &m_iva_blockers })
+        iva->finalize_geometry(true);
+
+    for (auto& iva : m_iva_seed_fills)
+        iva.finalize_geometry(true);
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+    GLShaderProgram* curr_shader = wxGetApp().get_current_shader();
+    if (curr_shader != nullptr)
+        curr_shader->stop_using();
+
+    GLShaderProgram* shader = wxGetApp().get_shader("flat");
+    if (shader != nullptr) {
+        shader->start_using();
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+
     ::glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
     for (vtype i : {ORIGINAL, SPLIT, INVALID}) {
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+        GLModel& va = m_varrays[i];
+        switch (i) {
+        case ORIGINAL: va.set_color({ 0.0f, 0.0f, 1.0f, 1.0f }); break;
+        case SPLIT:    va.set_color({ 1.0f, 0.0f, 0.0f, 1.0f }); break;
+        case INVALID:  va.set_color({ 1.0f, 1.0f, 0.0f, 1.0f }); break;
+        }
+        va.render();
+#else
         GLIndexedVertexArray& va = m_varrays[i];
         va.finalize_geometry(true);
         if (va.has_VBOs()) {
@@ -1005,11 +1168,67 @@ void TriangleSelectorGUI::render_debug(ImGuiWrapper* imgui)
             }
             va.render();
         }
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
     }
     ::glPolygonMode( GL_FRONT_AND_BACK, GL_FILL );
+
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+        shader->stop_using();
+    }
+
+    if (curr_shader != nullptr)
+        curr_shader->start_using();
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
 }
-#endif
+#endif // PRUSASLICER_TRIANGLE_SELECTOR_DEBUG
 
+#if ENABLE_GLBEGIN_GLEND_REMOVAL
+void TriangleSelectorGUI::update_paint_contour()
+{
+    m_paint_contour.reset();
 
+    GLModel::Geometry init_data;
+    const std::vector<Vec2i> contour_edges = this->get_seed_fill_contour();
+    const GLModel::Geometry::EIndexType index_type = (2 * contour_edges.size() < 65536) ? GLModel::Geometry::EIndexType::USHORT : GLModel::Geometry::EIndexType::UINT;
+    init_data.format = { GLModel::Geometry::EPrimitiveType::Lines, GLModel::Geometry::EVertexLayout::P3, index_type };
+    init_data.reserve_vertices(2 * contour_edges.size());
+    init_data.reserve_indices(2 * contour_edges.size());
+    // vertices + indices
+    unsigned int vertices_count = 0;
+    for (const Vec2i& edge : contour_edges) {
+        init_data.add_vertex(m_vertices[edge(0)].v);
+        init_data.add_vertex(m_vertices[edge(1)].v);
+        vertices_count += 2;
+        if (index_type == GLModel::Geometry::EIndexType::USHORT)
+            init_data.add_ushort_line((unsigned short)vertices_count - 2, (unsigned short)vertices_count - 1);
+        else
+            init_data.add_uint_line(vertices_count - 2, vertices_count - 1);
+    }
+
+    if (!init_data.is_empty())
+        m_paint_contour.init_from(std::move(init_data));
+}
+
+void TriangleSelectorGUI::render_paint_contour()
+{
+    auto* curr_shader = wxGetApp().get_current_shader();
+    if (curr_shader != nullptr)
+        curr_shader->stop_using();
+
+    auto* contour_shader = wxGetApp().get_shader("mm_contour");
+    if (contour_shader != nullptr) {
+        contour_shader->start_using();
+
+        glsafe(::glDepthFunc(GL_LEQUAL));
+        m_paint_contour.render();
+        glsafe(::glDepthFunc(GL_LESS));
+
+        contour_shader->stop_using();
+    }
+
+    if (curr_shader != nullptr)
+        curr_shader->start_using();
+}
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
 
 } // namespace Slic3r::GUI
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.hpp b/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.hpp
index 079f3f08e..37c7163e2 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.hpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.hpp
@@ -3,7 +3,11 @@
 
 #include "GLGizmoBase.hpp"
 
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+#include "slic3r/GUI/GLModel.hpp"
+#else
 #include "slic3r/GUI/3DScene.hpp"
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
 
 #include "libslic3r/ObjectID.hpp"
 #include "libslic3r/TriangleSelector.hpp"
@@ -28,6 +32,7 @@ enum class PainterGizmoType {
     MMU_SEGMENTATION
 };
 
+#if !ENABLE_GLBEGIN_GLEND_REMOVAL
 class GLPaintContour
 {
 public:
@@ -63,6 +68,7 @@ public:
     GLuint m_contour_VBO_id{0};
     GLuint m_contour_EBO_id{0};
 };
+#endif // !ENABLE_GLBEGIN_GLEND_REMOVAL
 
 class TriangleSelectorGUI : public TriangleSelector {
 public:
@@ -75,13 +81,13 @@ public:
     virtual void render(ImGuiWrapper *imgui);
     void         render() { this->render(nullptr); }
 
-    void request_update_render_data() { m_update_render_data = true; };
+    void request_update_render_data() { m_update_render_data = true; }
 
 #ifdef PRUSASLICER_TRIANGLE_SELECTOR_DEBUG
     void render_debug(ImGuiWrapper* imgui);
     bool m_show_triangles{false};
     bool m_show_invalid{false};
-#endif
+#endif // PRUSASLICER_TRIANGLE_SELECTOR_DEBUG
 
 protected:
     bool m_update_render_data = false;
@@ -91,13 +97,29 @@ protected:
 private:
     void update_render_data();
 
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+    GLModel                m_iva_enforcers;
+    GLModel                m_iva_blockers;
+    std::array<GLModel, 3> m_iva_seed_fills;
+#ifdef PRUSASLICER_TRIANGLE_SELECTOR_DEBUG
+    std::array<GLModel, 3> m_varrays;
+#endif // PRUSASLICER_TRIANGLE_SELECTOR_DEBUG
+#else
     GLIndexedVertexArray                m_iva_enforcers;
     GLIndexedVertexArray                m_iva_blockers;
     std::array<GLIndexedVertexArray, 3> m_iva_seed_fills;
     std::array<GLIndexedVertexArray, 3> m_varrays;
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
 
 protected:
+#if ENABLE_GLBEGIN_GLEND_REMOVAL
+    GLModel                      m_paint_contour;
+
+    void update_paint_contour();
+    void render_paint_contour();
+#else
     GLPaintContour                      m_paint_contour;
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
 };
 
 
@@ -209,7 +231,11 @@ private:
                               const Camera& camera,
                               const std::vector<Transform3d>& trafo_matrices) const;
 
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+    static std::shared_ptr<GLModel> s_sphere;
+#else
     static std::shared_ptr<GLIndexedVertexArray> s_sphere;
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
 
     bool m_internal_stack_active = false;
     bool m_schedule_update = false;
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoRotate.cpp b/src/slic3r/GUI/Gizmos/GLGizmoRotate.cpp
index 0c922a836..565e9f2af 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoRotate.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoRotate.cpp
@@ -235,8 +235,8 @@ void GLGizmoRotate::render_circle() const
 
         GLModel::Geometry init_data;
         init_data.format = { GLModel::Geometry::EPrimitiveType::LineLoop, GLModel::Geometry::EVertexLayout::P3, GLModel::Geometry::EIndexType::USHORT };
-        init_data.vertices.reserve(ScaleStepsCount * GLModel::Geometry::vertex_stride_floats(init_data.format));
-        init_data.indices.reserve(ScaleStepsCount * GLModel::Geometry::index_stride_bytes(init_data.format));
+        init_data.reserve_vertices(ScaleStepsCount);
+        init_data.reserve_indices(ScaleStepsCount);
 
         // vertices + indices
         for (unsigned short i = 0; i < ScaleStepsCount; ++i) {
@@ -278,8 +278,8 @@ void GLGizmoRotate::render_scale() const
 
         GLModel::Geometry init_data;
         init_data.format = { GLModel::Geometry::EPrimitiveType::Lines, GLModel::Geometry::EVertexLayout::P3, GLModel::Geometry::EIndexType::USHORT };
-        init_data.vertices.reserve(2 * ScaleStepsCount * GLModel::Geometry::vertex_stride_floats(init_data.format));
-        init_data.indices.reserve(2 * ScaleStepsCount * GLModel::Geometry::index_stride_bytes(init_data.format));
+        init_data.reserve_vertices(2 * ScaleStepsCount);
+        init_data.reserve_indices(2 * ScaleStepsCount);
 
         // vertices + indices
         for (unsigned short i = 0; i < ScaleStepsCount; ++i) {
@@ -337,8 +337,8 @@ void GLGizmoRotate::render_snap_radii() const
 
         GLModel::Geometry init_data;
         init_data.format = { GLModel::Geometry::EPrimitiveType::Lines, GLModel::Geometry::EVertexLayout::P3, GLModel::Geometry::EIndexType::USHORT };
-        init_data.vertices.reserve(2 * ScaleStepsCount * GLModel::Geometry::vertex_stride_floats(init_data.format));
-        init_data.indices.reserve(2 * ScaleStepsCount * GLModel::Geometry::index_stride_bytes(init_data.format));
+        init_data.reserve_vertices(2 * ScaleStepsCount);
+        init_data.reserve_indices(2 * ScaleStepsCount);
 
         // vertices + indices
         for (unsigned short i = 0; i < ScaleStepsCount; ++i) {
@@ -388,8 +388,8 @@ void GLGizmoRotate::render_reference_radius(const ColorRGBA& color, bool radius_
 
         GLModel::Geometry init_data;
         init_data.format = { GLModel::Geometry::EPrimitiveType::Lines, GLModel::Geometry::EVertexLayout::P3, GLModel::Geometry::EIndexType::USHORT };
-        init_data.vertices.reserve(2 * GLModel::Geometry::vertex_stride_floats(init_data.format));
-        init_data.indices.reserve(2 * GLModel::Geometry::index_stride_bytes(init_data.format));
+        init_data.reserve_vertices(2);
+        init_data.reserve_indices(2);
 
         // vertices
         init_data.add_vertex(Vec3f(0.0f, 0.0f, 0.0f));
@@ -429,8 +429,8 @@ void GLGizmoRotate::render_angle() const
 
         GLModel::Geometry init_data;
         init_data.format = { GLModel::Geometry::EPrimitiveType::LineStrip, GLModel::Geometry::EVertexLayout::P3, GLModel::Geometry::EIndexType::USHORT };
-        init_data.vertices.reserve((1 + AngleResolution) * GLModel::Geometry::vertex_stride_floats(init_data.format));
-        init_data.indices.reserve((1 + AngleResolution) * GLModel::Geometry::index_stride_bytes(init_data.format));
+        init_data.reserve_vertices(1 + AngleResolution);
+        init_data.reserve_indices(1 + AngleResolution);
 
         // vertices + indices
         for (unsigned short i = 0; i <= AngleResolution; ++i) {
@@ -466,8 +466,8 @@ void GLGizmoRotate::render_grabber_connection(const ColorRGBA& color, bool radiu
 
         GLModel::Geometry init_data;
         init_data.format = { GLModel::Geometry::EPrimitiveType::Lines, GLModel::Geometry::EVertexLayout::P3, GLModel::Geometry::EIndexType::USHORT };
-        init_data.vertices.reserve(2 * GLModel::Geometry::vertex_stride_floats(init_data.format));
-        init_data.indices.reserve(2 * GLModel::Geometry::index_stride_bytes(init_data.format));
+        init_data.reserve_vertices(2);
+        init_data.reserve_indices(2);
 
         // vertices
         init_data.add_vertex(Vec3f(0.0f, 0.0f, 0.0f));
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoScale.cpp b/src/slic3r/GUI/Gizmos/GLGizmoScale.cpp
index d0afd4caa..4f7e375df 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoScale.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoScale.cpp
@@ -403,8 +403,8 @@ void GLGizmoScale3D::render_grabbers_connection(unsigned int id_1, unsigned int
 
         GLModel::Geometry init_data;
         init_data.format = { GLModel::Geometry::EPrimitiveType::Lines, GLModel::Geometry::EVertexLayout::P3, GLModel::Geometry::EIndexType::USHORT };
-        init_data.vertices.reserve(2 * GLModel::Geometry::vertex_stride_floats(init_data.format));
-        init_data.indices.reserve(2 * GLModel::Geometry::index_stride_bytes(init_data.format));
+        init_data.reserve_vertices(2);
+        init_data.reserve_indices(2);
 
         // vertices
         init_data.add_vertex((Vec3f)m_grabbers[id_1].center.cast<float>());
diff --git a/src/slic3r/GUI/Gizmos/GLGizmosCommon.cpp b/src/slic3r/GUI/Gizmos/GLGizmosCommon.cpp
index cc53f267c..1e49ebc8c 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmosCommon.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmosCommon.cpp
@@ -213,15 +213,21 @@ void InstancesHider::render_cut() const
             clipper->set_limiting_plane(ClippingPlane::ClipsNothing());
 
         glsafe(::glPushMatrix());
+#if !ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
         if (mv->is_model_part())
             glsafe(::glColor3f(0.8f, 0.3f, 0.0f));
         else {
             const ColorRGBA color = color_from_model_volume(*mv);
             glsafe(::glColor4fv(color.data()));
         }
+#endif // !ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
         glsafe(::glPushAttrib(GL_DEPTH_TEST));
         glsafe(::glDisable(GL_DEPTH_TEST));
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+        clipper->render_cut(mv->is_model_part() ? ColorRGBA(0.8f, 0.3f, 0.0f, 1.0f) : color_from_model_volume(*mv));
+#else
         clipper->render_cut();
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
         glsafe(::glPopAttrib());
         glsafe(::glPopMatrix());
 
@@ -417,8 +423,12 @@ void ObjectClipper::render_cut() const
         clipper->set_transformation(trafo);
         clipper->set_limiting_plane(ClippingPlane(Vec3d::UnitZ(), -SINKING_Z_THRESHOLD));
         glsafe(::glPushMatrix());
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+        clipper->render_cut({ 1.0f, 0.37f, 0.0f, 1.0f });
+#else
         glsafe(::glColor3f(1.0f, 0.37f, 0.0f));
         clipper->render_cut();
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
         glsafe(::glPopMatrix());
 
         ++clipper_id;
@@ -530,8 +540,12 @@ void SupportsClipper::render_cut() const
     m_clipper->set_transformation(supports_trafo);
 
     glsafe(::glPushMatrix());
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+    m_clipper->render_cut({ 1.0f, 0.f, 0.37f, 1.0f });
+#else
     glsafe(::glColor3f(1.0f, 0.f, 0.37f));
     m_clipper->render_cut();
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
     glsafe(::glPopMatrix());
 }
 
diff --git a/src/slic3r/GUI/ImGuiWrapper.cpp b/src/slic3r/GUI/ImGuiWrapper.cpp
index 658105d97..581c19147 100644
--- a/src/slic3r/GUI/ImGuiWrapper.cpp
+++ b/src/slic3r/GUI/ImGuiWrapper.cpp
@@ -70,6 +70,9 @@ static const std::map<const wchar_t, std::string> font_icons = {
     {ImGui::LegendColorChanges    , "legend_colorchanges"           },
     {ImGui::LegendPausePrints     , "legend_pauseprints"            },
     {ImGui::LegendCustomGCodes    , "legend_customgcodes"           },
+#if ENABLE_SHOW_TOOLPATHS_COG
+    {ImGui::LegendCOG             , "legend_cog"                    },
+#endif // ENABLE_SHOW_TOOLPATHS_COG
     {ImGui::LegendShells          , "legend_shells"                 },
     {ImGui::LegendToolMarker      , "legend_toolmarker"             },
 #endif // ENABLE_LEGEND_TOOLBAR_ICONS
diff --git a/src/slic3r/GUI/MeshUtils.cpp b/src/slic3r/GUI/MeshUtils.cpp
index c385eaa78..ed56bc357 100644
--- a/src/slic3r/GUI/MeshUtils.cpp
+++ b/src/slic3r/GUI/MeshUtils.cpp
@@ -6,6 +6,9 @@
 #include "libslic3r/ClipperUtils.hpp"
 #include "libslic3r/Model.hpp"
 
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+#include "slic3r/GUI/GUI_App.hpp"
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
 #include "slic3r/GUI/Camera.hpp"
 
 #include <GL/glew.h>
@@ -66,13 +69,34 @@ void MeshClipper::set_transformation(const Geometry::Transformation& trafo)
 
 
 
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+void MeshClipper::render_cut(const ColorRGBA& color)
+#else
 void MeshClipper::render_cut()
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
 {
     if (! m_triangles_valid)
         recalculate_triangles();
 
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+    GLShaderProgram* curr_shader = wxGetApp().get_current_shader();
+    if (curr_shader != nullptr)
+        curr_shader->stop_using();
+
+    GLShaderProgram* shader = wxGetApp().get_shader("flat");
+    if (shader != nullptr) {
+        shader->start_using();
+        m_model.set_color(color);
+        m_model.render();
+        shader->stop_using();
+    }
+
+    if (curr_shader != nullptr)
+        curr_shader->start_using();
+#else
     if (m_vertex_array.has_VBOs())
         m_vertex_array.render();
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
 }
 
 
@@ -161,6 +185,30 @@ void MeshClipper::recalculate_triangles()
 
     tr.pretranslate(0.001 * m_plane.get_normal().normalized()); // to avoid z-fighting
 
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+    m_model.reset();
+
+    GLModel::Geometry init_data;
+    const GLModel::Geometry::EIndexType index_type = (m_triangles2d.size() < 65536) ? GLModel::Geometry::EIndexType::USHORT : GLModel::Geometry::EIndexType::UINT;
+    init_data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3N3, index_type };
+    init_data.reserve_vertices(m_triangles2d.size());
+    init_data.reserve_indices(m_triangles2d.size());
+
+    // vertices + indices
+    for (auto it = m_triangles2d.cbegin(); it != m_triangles2d.cend(); it = it + 3) {
+        init_data.add_vertex((Vec3f)(tr * Vec3d((*(it + 0)).x(), (*(it + 0)).y(), height_mesh)).cast<float>(), (Vec3f)up.cast<float>());
+        init_data.add_vertex((Vec3f)(tr * Vec3d((*(it + 1)).x(), (*(it + 1)).y(), height_mesh)).cast<float>(), (Vec3f)up.cast<float>());
+        init_data.add_vertex((Vec3f)(tr * Vec3d((*(it + 2)).x(), (*(it + 2)).y(), height_mesh)).cast<float>(), (Vec3f)up.cast<float>());
+        const size_t idx = it - m_triangles2d.cbegin();
+        if (index_type == GLModel::Geometry::EIndexType::USHORT)
+            init_data.add_ushort_triangle((unsigned short)idx, (unsigned short)idx + 1, (unsigned short)idx + 2);
+        else
+            init_data.add_uint_triangle((unsigned int)idx, (unsigned int)idx + 1, (unsigned int)idx + 2);
+    }
+
+    if (!init_data.is_empty())
+        m_model.init_from(std::move(init_data));
+#else
     m_vertex_array.release_geometry();
     for (auto it=m_triangles2d.cbegin(); it != m_triangles2d.cend(); it=it+3) {
         m_vertex_array.push_geometry(tr * Vec3d((*(it+0))(0), (*(it+0))(1), height_mesh), up);
@@ -170,6 +218,7 @@ void MeshClipper::recalculate_triangles()
         m_vertex_array.push_triangle(idx, idx+1, idx+2);
     }
     m_vertex_array.finalize_geometry(true);
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
 
     m_triangles_valid = true;
 }
diff --git a/src/slic3r/GUI/MeshUtils.hpp b/src/slic3r/GUI/MeshUtils.hpp
index dc4f59ceb..341b50594 100644
--- a/src/slic3r/GUI/MeshUtils.hpp
+++ b/src/slic3r/GUI/MeshUtils.hpp
@@ -6,7 +6,11 @@
 #include "libslic3r/SLA/IndexedMesh.hpp"
 #include "admesh/stl.h"
 
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+#include "slic3r/GUI/GLModel.hpp"
+#else
 #include "slic3r/GUI/3DScene.hpp"
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
 
 #include <cfloat>
 
@@ -69,7 +73,8 @@ public:
 
 
 // MeshClipper class cuts a mesh and is able to return a triangulated cut.
-class MeshClipper {
+class MeshClipper
+{
 public:
     // Inform MeshClipper about which plane we want to use to cut the mesh
     // This is supposed to be in world coordinates.
@@ -92,7 +97,11 @@ public:
 
     // Render the triangulated cut. Transformation matrices should
     // be set in world coords.
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+    void render_cut(const ColorRGBA& color);
+#else
     void render_cut();
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
 
 private:
     void recalculate_triangles();
@@ -103,7 +112,11 @@ private:
     ClippingPlane m_plane;
     ClippingPlane m_limiting_plane = ClippingPlane::ClipsNothing();
     std::vector<Vec2f> m_triangles2d;
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+    GLModel m_model;
+#else
     GLIndexedVertexArray m_vertex_array;
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
     bool m_triangles_valid = false;
 };
 
diff --git a/src/slic3r/GUI/MsgDialog.cpp b/src/slic3r/GUI/MsgDialog.cpp
index acdbd249c..35d68e52e 100644
--- a/src/slic3r/GUI/MsgDialog.cpp
+++ b/src/slic3r/GUI/MsgDialog.cpp
@@ -95,9 +95,9 @@ wxButton* MsgDialog::get_button(wxWindowID btn_id){
 void MsgDialog::apply_style(long style)
 {
     if (style & wxOK)       add_button(wxID_OK, true);
-    if (style & wxYES)      add_button(wxID_YES, true);
-    if (style & wxNO)       add_button(wxID_NO);
-    if (style & wxCANCEL)   add_button(wxID_CANCEL);
+    if (style & wxYES)      add_button(wxID_YES,   !(style & wxNO_DEFAULT));
+    if (style & wxNO)       add_button(wxID_NO,     (style & wxNO_DEFAULT));
+    if (style & wxCANCEL)   add_button(wxID_CANCEL, (style & wxCANCEL_DEFAULT));
 
     logo->SetBitmap( create_scaled_bitmap(style & wxICON_WARNING        ? "exclamation" :
                                           style & wxICON_INFORMATION    ? "info"        :
@@ -299,25 +299,12 @@ wxString get_wraped_wxString(const wxString& in, size_t line_len /*=80*/)
     for (size_t i = 0; i < in.size();) {
         // Overwrite the character (space or newline) starting at ibreak?
         bool   overwrite = false;
-#if wxUSE_UNICODE_WCHAR
-        // On Windows, most likely the internal representation of wxString is wide char.
-        size_t end       = std::min(in.size(), i + line_len);
-        size_t ibreak    = end;
-        for (size_t j = i; j < end; ++ j) {
-            if (bool newline = in[j] == '\n'; in[j] == ' ' || in[j] == '\t' || newline) {
-                ibreak = j;
-                overwrite = true;
-                if (newline)
-                    break;
-            } else if (in[j] == '/' || in[j] == '\\')
-                ibreak = j + 1;
-        }
-#else 
         // UTF8 representation of wxString.
         // Where to break the line, index of character at the start of a UTF-8 sequence.
         size_t ibreak    = size_t(-1);
         // Overwrite the character at ibreak (it is a whitespace) or not?
-        for (size_t cnt = 0, j = i; j < in.size();) {
+        size_t j = i;
+        for (size_t cnt = 0; j < in.size();) {
             if (bool newline = in[j] == '\n'; in[j] == ' ' || in[j] == '\t' || newline) {
                 // Overwrite the whitespace.
                 ibreak    = j ++;
@@ -326,16 +313,23 @@ wxString get_wraped_wxString(const wxString& in, size_t line_len /*=80*/)
                     break;
             } else if (in[j] == '/') {
                 // Insert after the slash.
-                ibreak = ++ j;
+                ibreak    = ++ j;
+                overwrite = false;
             } else
                 j += get_utf8_sequence_length(in.c_str() + j, in.size() - j);
             if (++ cnt == line_len) {
-                if (ibreak == size_t(-1))
-                    ibreak = j;
+                if (ibreak == size_t(-1)) {
+                    ibreak    = j;
+                    overwrite = false;
+                }
                 break;
             }
         }
-#endif
+        if (j == in.size()) {
+            out.append(in.begin() + i, in.end());
+            break;
+        }
+        assert(ibreak != size_t(-1));
         out.append(in.begin() + i, in.begin() + ibreak);
         out.append('\n');
         i = ibreak;
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 0eda5b424..6bbbd31f4 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -3539,8 +3539,45 @@ void Plater::priv::replace_with_stl()
     }
 }
 
+#if ENABLE_RELOAD_FROM_DISK_REWORK
+static std::vector<std::pair<int, int>> reloadable_volumes(const Model& model, const Selection& selection)
+{
+    std::vector<std::pair<int, int>> ret;
+    const std::set<unsigned int>& selected_volumes_idxs = selection.get_volume_idxs();
+    for (unsigned int idx : selected_volumes_idxs) {
+        const GLVolume& v = *selection.get_volume(idx);
+        const int o_idx = v.object_idx();
+        if (0 <= o_idx && o_idx < int(model.objects.size())) {
+            const ModelObject* obj = model.objects[o_idx];
+            const int v_idx = v.volume_idx();
+            if (0 <= v_idx && v_idx < int(obj->volumes.size())) {
+                const ModelVolume* vol = obj->volumes[v_idx];
+                if (!vol->source.is_from_builtin_objects && !vol->source.input_file.empty() &&
+                    !fs::path(vol->source.input_file).extension().string().empty())
+                    ret.push_back({ o_idx, v_idx });
+            }
+        }
+    }
+    return ret;
+}
+#endif // ENABLE_RELOAD_FROM_DISK_REWORK
+
 void Plater::priv::reload_from_disk()
 {
+#if ENABLE_RELOAD_FROM_DISK_REWORK
+    // collect selected reloadable ModelVolumes
+    std::vector<std::pair<int, int>> selected_volumes = reloadable_volumes(model, get_selection());
+
+    // nothing to reload, return
+    if (selected_volumes.empty())
+        return;
+
+    std::sort(selected_volumes.begin(), selected_volumes.end(), [](const std::pair<int, int>& v1, const std::pair<int, int>& v2) {
+        return (v1.first < v2.first) || (v1.first == v2.first && v1.second < v2.second);
+        });
+    selected_volumes.erase(std::unique(selected_volumes.begin(), selected_volumes.end(), [](const std::pair<int, int>& v1, const std::pair<int, int>& v2) {
+        return (v1.first == v2.first) && (v1.second == v2.second); }), selected_volumes.end());
+#else
     Plater::TakeSnapshot snapshot(q, _L("Reload from disk"));
 
     const Selection& selection = get_selection();
@@ -3573,10 +3610,36 @@ void Plater::priv::reload_from_disk()
     }
     std::sort(selected_volumes.begin(), selected_volumes.end());
     selected_volumes.erase(std::unique(selected_volumes.begin(), selected_volumes.end()), selected_volumes.end());
+#endif // ENABLE_RELOAD_FROM_DISK_REWORK
 
     // collects paths of files to load
     std::vector<fs::path> input_paths;
     std::vector<fs::path> missing_input_paths;
+#if ENABLE_RELOAD_FROM_DISK_REWORK
+    std::vector<std::pair<fs::path, fs::path>> replace_paths;
+    for (auto [obj_idx, vol_idx] : selected_volumes) {
+        const ModelObject* object = model.objects[obj_idx];
+        const ModelVolume* volume = object->volumes[vol_idx];
+        if (fs::exists(volume->source.input_file))
+            input_paths.push_back(volume->source.input_file);
+        else {
+            // searches the source in the same folder containing the object
+            bool found = false;
+            if (!object->input_file.empty()) {
+                fs::path object_path = fs::path(object->input_file).remove_filename();
+                if (!object_path.empty()) {
+                    object_path /= fs::path(volume->source.input_file).filename();
+                    if (fs::exists(object_path)) {
+                        input_paths.push_back(object_path);
+                        found = true;
+                    }
+                }
+            }
+            if (!found)
+                missing_input_paths.push_back(volume->source.input_file);
+        }
+    }
+#else
     std::vector<fs::path> replace_paths;
     for (const SelectedVolume& v : selected_volumes) {
         const ModelObject* object = model.objects[v.object_idx];
@@ -3606,6 +3669,7 @@ void Plater::priv::reload_from_disk()
         else if (!object->input_file.empty() && volume->is_model_part() && !volume->name.empty() && !volume->source.is_from_builtin_objects)
             missing_input_paths.push_back(volume->name);
     }
+#endif // ENABLE_RELOAD_FROM_DISK_REWORK
 
     std::sort(missing_input_paths.begin(), missing_input_paths.end());
     missing_input_paths.erase(std::unique(missing_input_paths.begin(), missing_input_paths.end()), missing_input_paths.end());
@@ -3649,7 +3713,11 @@ void Plater::priv::reload_from_disk()
             //wxMessageDialog dlg(q, message, wxMessageBoxCaptionStr, wxYES_NO | wxYES_DEFAULT | wxICON_QUESTION);
             MessageDialog dlg(q, message, wxMessageBoxCaptionStr, wxYES_NO | wxYES_DEFAULT | wxICON_QUESTION);
             if (dlg.ShowModal() == wxID_YES)
-                replace_paths.push_back(sel_filename_path);
+#if ENABLE_RELOAD_FROM_DISK_REWORK
+                replace_paths.emplace_back(search, sel_filename_path);
+#else
+                replace_paths.emplace_back(sel_filename_path);
+#endif // ENABLE_RELOAD_FROM_DISK_REWORK
             missing_input_paths.pop_back();
         }
     }
@@ -3660,6 +3728,10 @@ void Plater::priv::reload_from_disk()
     std::sort(replace_paths.begin(), replace_paths.end());
     replace_paths.erase(std::unique(replace_paths.begin(), replace_paths.end()), replace_paths.end());
 
+#if ENABLE_RELOAD_FROM_DISK_REWORK
+    Plater::TakeSnapshot snapshot(q, _L("Reload from disk"));
+#endif // ENABLE_RELOAD_FROM_DISK_REWORK
+
     std::vector<wxString> fail_list;
 
     Busy busy(_L("Reload from:"), q->get_current_canvas3D()->get_wxglcanvas());
@@ -3688,6 +3760,86 @@ void Plater::priv::reload_from_disk()
         }
 
         // update the selected volumes whose source is the current file
+#if ENABLE_RELOAD_FROM_DISK_REWORK
+        for (auto [obj_idx, vol_idx] : selected_volumes) {
+            ModelObject* old_model_object = model.objects[obj_idx];
+            ModelVolume* old_volume = old_model_object->volumes[vol_idx];
+
+            bool sinking = old_model_object->bounding_box().min.z() < SINKING_Z_THRESHOLD;
+
+            bool has_source = !old_volume->source.input_file.empty() && boost::algorithm::iequals(fs::path(old_volume->source.input_file).filename().string(), fs::path(path).filename().string());
+            bool has_name = !old_volume->name.empty() && boost::algorithm::iequals(old_volume->name, fs::path(path).filename().string());
+            if (has_source || has_name) {
+                int new_volume_idx = -1;
+                int new_object_idx = -1;
+                bool match_found = false;
+                // take idxs from the matching volume
+                if (has_source && old_volume->source.object_idx < int(new_model.objects.size())) {
+                    const ModelObject* obj = new_model.objects[old_volume->source.object_idx];
+                    if (old_volume->source.volume_idx < int(obj->volumes.size())) {
+                        if (obj->volumes[old_volume->source.volume_idx]->name == old_volume->name) {
+                            new_volume_idx = old_volume->source.volume_idx;
+                            new_object_idx = old_volume->source.object_idx;
+                            match_found = true;
+                        }
+                    }
+                }
+
+                if (!match_found && has_name) {
+                    // take idxs from the 1st matching volume
+                    for (size_t o = 0; o < new_model.objects.size(); ++o) {
+                        ModelObject* obj = new_model.objects[o];
+                        bool found = false;
+                        for (size_t v = 0; v < obj->volumes.size(); ++v) {
+                            if (obj->volumes[v]->name == old_volume->name) {
+                                new_volume_idx = (int)v;
+                                new_object_idx = (int)o;
+                                found = true;
+                                break;
+                            }
+                        }
+                        if (found)
+                            break;
+                    }
+                }
+
+                if (new_object_idx < 0 || int(new_model.objects.size()) <= new_object_idx) {
+                    fail_list.push_back(from_u8(has_source ? old_volume->source.input_file : old_volume->name));
+                    continue;
+                }
+                ModelObject* new_model_object = new_model.objects[new_object_idx];
+                if (new_volume_idx < 0 || int(new_model_object->volumes.size()) <= new_volume_idx) {
+                    fail_list.push_back(from_u8(has_source ? old_volume->source.input_file : old_volume->name));
+                    continue;
+                }
+
+                old_model_object->add_volume(*new_model_object->volumes[new_volume_idx]);
+                ModelVolume* new_volume = old_model_object->volumes.back();
+                new_volume->set_new_unique_id();
+                new_volume->config.apply(old_volume->config);
+                new_volume->set_type(old_volume->type());
+                new_volume->set_material_id(old_volume->material_id());
+                new_volume->set_transformation(Geometry::assemble_transform(old_volume->source.transform.get_offset()) *
+                                               old_volume->get_transformation().get_matrix(true) *
+                                               old_volume->source.transform.get_matrix(true));
+                new_volume->translate(new_volume->get_transformation().get_matrix(true) * (new_volume->source.mesh_offset - old_volume->source.mesh_offset));
+                new_volume->source.object_idx = old_volume->source.object_idx;
+                new_volume->source.volume_idx = old_volume->source.volume_idx;
+                assert(!old_volume->source.is_converted_from_inches || !old_volume->source.is_converted_from_meters);
+                if (old_volume->source.is_converted_from_inches)
+                    new_volume->convert_from_imperial_units();
+                else if (old_volume->source.is_converted_from_meters)
+                    new_volume->convert_from_meters();
+                std::swap(old_model_object->volumes[vol_idx], old_model_object->volumes.back());
+                old_model_object->delete_volume(old_model_object->volumes.size() - 1);
+                if (!sinking)
+                    old_model_object->ensure_on_bed();
+                old_model_object->sort_volumes(wxGetApp().app_config->get("order_volumes") == "1");
+
+                sla::reproject_points_and_holes(old_model_object);
+            }
+        }
+#else
         for (const SelectedVolume& sel_v : selected_volumes) {
             ModelObject* old_model_object = model.objects[sel_v.object_idx];
             ModelVolume* old_volume = old_model_object->volumes[sel_v.volume_idx];
@@ -3764,10 +3916,19 @@ void Plater::priv::reload_from_disk()
                 sla::reproject_points_and_holes(old_model_object);
             }
         }
+#endif // ENABLE_RELOAD_FROM_DISK_REWORK
     }
 
     busy.reset();
 
+#if ENABLE_RELOAD_FROM_DISK_REWORK
+    for (auto [src, dest] : replace_paths) {
+        for (auto [obj_idx, vol_idx] : selected_volumes) {
+            if (boost::algorithm::iequals(model.objects[obj_idx]->volumes[vol_idx]->source.input_file, src.string()))
+                replace_volume_with_stl(obj_idx, vol_idx, dest, "");
+        }
+    }
+#else
     for (size_t i = 0; i < replace_paths.size(); ++i) {
         const auto& path = replace_paths[i].string();
         for (const SelectedVolume& sel_v : selected_volumes) {
@@ -3777,6 +3938,7 @@ void Plater::priv::reload_from_disk()
             replace_volume_with_stl(sel_v.object_idx, sel_v.volume_idx, path, "");
         }
     }
+#endif // ENABLE_RELOAD_FROM_DISK_REWORK
 
     if (!fail_list.empty()) {
         wxString message = _L("Unable to reload:") + "\n";
@@ -4572,6 +4734,13 @@ bool Plater::priv::can_replace_with_stl() const
 
 bool Plater::priv::can_reload_from_disk() const
 {
+#if ENABLE_RELOAD_FROM_DISK_REWORK
+    // collect selected reloadable ModelVolumes
+    std::vector<std::pair<int, int>> selected_volumes = reloadable_volumes(model, get_selection());
+    // nothing to reload, return
+    if (selected_volumes.empty())
+        return false;
+#else
     // struct to hold selected ModelVolumes by their indices
     struct SelectedVolume
     {
@@ -4597,6 +4766,21 @@ bool Plater::priv::can_reload_from_disk() const
                 selected_volumes.push_back({ o_idx, v_idx });
         }
     }
+#endif // ENABLE_RELOAD_FROM_DISK_REWORK
+
+#if ENABLE_RELOAD_FROM_DISK_REWORK
+    std::sort(selected_volumes.begin(), selected_volumes.end(), [](const std::pair<int, int>& v1, const std::pair<int, int>& v2) {
+        return (v1.first < v2.first) || (v1.first == v2.first && v1.second < v2.second);
+        });
+    selected_volumes.erase(std::unique(selected_volumes.begin(), selected_volumes.end(), [](const std::pair<int, int>& v1, const std::pair<int, int>& v2) {
+        return (v1.first == v2.first) && (v1.second == v2.second); }), selected_volumes.end());
+
+    // collects paths of files to load
+    std::vector<fs::path> paths;
+    for (auto [obj_idx, vol_idx] : selected_volumes) {
+        paths.push_back(model.objects[obj_idx]->volumes[vol_idx]->source.input_file);
+    }
+#else
     std::sort(selected_volumes.begin(), selected_volumes.end());
     selected_volumes.erase(std::unique(selected_volumes.begin(), selected_volumes.end()), selected_volumes.end());
 
@@ -4610,6 +4794,7 @@ bool Plater::priv::can_reload_from_disk() const
         else if (!object->input_file.empty() && !volume->name.empty() && !volume->source.is_from_builtin_objects)
             paths.push_back(volume->name);
     }
+#endif // ENABLE_RELOAD_FROM_DISK_REWORK
     std::sort(paths.begin(), paths.end());
     paths.erase(std::unique(paths.begin(), paths.end()), paths.end());
 
@@ -5375,17 +5560,22 @@ bool Plater::load_files(const wxArrayString& filenames)
         if (boost::algorithm::iends_with(filename, ".3mf") || boost::algorithm::iends_with(filename, ".amf")) {
             LoadType load_type = LoadType::Unknown;
             if (!model().objects.empty()) {
-                if (wxGetApp().app_config->get("show_drop_project_dialog") == "1") {
-                    ProjectDropDialog dlg(filename);
-                    if (dlg.ShowModal() == wxID_OK) {
-                        int choice = dlg.get_action();
-                        load_type = static_cast<LoadType>(choice);
-                        wxGetApp().app_config->set("drop_project_action", std::to_string(choice));
+                if ((boost::algorithm::iends_with(filename, ".3mf") && !is_project_3mf(it->string())) ||
+                    (boost::algorithm::iends_with(filename, ".amf") && !boost::algorithm::iends_with(filename, ".zip.amf")))
+                    load_type = LoadType::OpenProject;
+                else {
+                    if (wxGetApp().app_config->get("show_drop_project_dialog") == "1") {
+                        ProjectDropDialog dlg(filename);
+                        if (dlg.ShowModal() == wxID_OK) {
+                            int choice = dlg.get_action();
+                            load_type = static_cast<LoadType>(choice);
+                            wxGetApp().app_config->set("drop_project_action", std::to_string(choice));
+                        }
                     }
+                    else
+                        load_type = static_cast<LoadType>(std::clamp(std::stoi(wxGetApp().app_config->get("drop_project_action")),
+                            static_cast<int>(LoadType::OpenProject), static_cast<int>(LoadType::LoadConfig)));
                 }
-                else
-                    load_type = static_cast<LoadType>(std::clamp(std::stoi(wxGetApp().app_config->get("drop_project_action")),
-                        static_cast<int>(LoadType::OpenProject), static_cast<int>(LoadType::LoadConfig)));
             }
             else
                 load_type = LoadType::OpenProject;
diff --git a/src/slic3r/GUI/Preferences.cpp b/src/slic3r/GUI/Preferences.cpp
index 2af008a52..75c5c116f 100644
--- a/src/slic3r/GUI/Preferences.cpp
+++ b/src/slic3r/GUI/Preferences.cpp
@@ -790,10 +790,10 @@ void PreferencesDialog::create_settings_mode_widget()
 	}
 
 	std::string opt_key = "settings_layout_mode";
-	m_blinkers[opt_key] = new BlinkingBitmap(this);
+	m_blinkers[opt_key] = new BlinkingBitmap(parent);
 
 	auto sizer = new wxBoxSizer(wxHORIZONTAL);
-	sizer->Add(m_blinkers[opt_key], 0, wxALIGN_CENTER_VERTICAL);
+	sizer->Add(m_blinkers[opt_key], 0, wxRIGHT, 2);
 	sizer->Add(stb_sizer, 1, wxALIGN_CENTER_VERTICAL);
 	m_optgroup_gui->sizer->Add(sizer, 0, wxEXPAND | wxTOP, em_unit());
 
@@ -810,13 +810,13 @@ void PreferencesDialog::create_settings_text_color_widget()
 	if (!wxOSX) stb->SetBackgroundStyle(wxBG_STYLE_PAINT);
 
 	std::string opt_key = "text_colors";
-	m_blinkers[opt_key] = new BlinkingBitmap(this);
+	m_blinkers[opt_key] = new BlinkingBitmap(parent);
 
 	wxSizer* stb_sizer = new wxStaticBoxSizer(stb, wxVERTICAL);
 	ButtonsDescription::FillSizerWithTextColorDescriptions(stb_sizer, parent, &m_sys_colour, &m_mod_colour);
 
 	auto sizer = new wxBoxSizer(wxHORIZONTAL);
-	sizer->Add(m_blinkers[opt_key], 0, wxALIGN_CENTER_VERTICAL);
+	sizer->Add(m_blinkers[opt_key], 0, wxRIGHT, 2);
 	sizer->Add(stb_sizer, 1, wxALIGN_CENTER_VERTICAL);
 
 	m_optgroup_gui->sizer->Add(sizer, 0, wxEXPAND | wxTOP, em_unit());
diff --git a/src/slic3r/GUI/Selection.cpp b/src/slic3r/GUI/Selection.cpp
index a9eea84a7..9b362c4d4 100644
--- a/src/slic3r/GUI/Selection.cpp
+++ b/src/slic3r/GUI/Selection.cpp
@@ -1427,10 +1427,10 @@ void Selection::render(float scale_factor)
         return;
 
     m_scale_factor = scale_factor;
+    // render cumulative bounding box of selected volumes
 #if ENABLE_GLBEGIN_GLEND_REMOVAL
     render_bounding_box(get_bounding_box(), ColorRGB::WHITE());
 #else
-    // render cumulative bounding box of selected volumes
     render_selected_volumes();
 #endif // ENABLE_GLBEGIN_GLEND_REMOVAL
     render_synchronized_volumes();
@@ -1442,6 +1442,14 @@ void Selection::render_center(bool gizmo_is_dragging)
     if (!m_valid || is_empty())
         return;
 
+#if ENABLE_GLBEGIN_GLEND_REMOVAL
+    GLShaderProgram* shader = wxGetApp().get_shader("flat");
+    if (shader == nullptr)
+        return;
+
+    shader->start_using();
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
+
     const Vec3d center = gizmo_is_dragging ? m_cache.dragging_center : get_bounding_box().center();
 
     glsafe(::glDisable(GL_DEPTH_TEST));
@@ -1450,19 +1458,17 @@ void Selection::render_center(bool gizmo_is_dragging)
     glsafe(::glTranslated(center.x(), center.y(), center.z()));
 
 #if ENABLE_GLBEGIN_GLEND_REMOVAL
-    GLShaderProgram* shader = wxGetApp().get_shader("flat");
-    if (shader == nullptr)
-        return;
-
-    shader->start_using();
-#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
+    m_vbo_sphere.set_color(ColorRGBA::WHITE());
+#else
     m_vbo_sphere.set_color(-1, ColorRGBA::WHITE());
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
     m_vbo_sphere.render();
+
+    glsafe(::glPopMatrix());
+
 #if ENABLE_GLBEGIN_GLEND_REMOVAL
     shader->stop_using();
 #endif // ENABLE_GLBEGIN_GLEND_REMOVAL
-
-    glsafe(::glPopMatrix());
 }
 #endif // ENABLE_RENDER_SELECTION_CENTER
 
@@ -2037,8 +2043,8 @@ void Selection::render_bounding_box(const BoundingBoxf3 & box, float* color) con
 
         GLModel::Geometry init_data;
         init_data.format = { GLModel::Geometry::EPrimitiveType::Lines, GLModel::Geometry::EVertexLayout::P3, GLModel::Geometry::EIndexType::USHORT };
-        init_data.vertices.reserve(48 * GLModel::Geometry::vertex_stride_floats(init_data.format));
-        init_data.indices.reserve(48 * GLModel::Geometry::index_stride_bytes(init_data.format));
+        init_data.reserve_vertices(48);
+        init_data.reserve_indices(48);
 
         // vertices
         init_data.add_vertex(Vec3f(b_min.x(), b_min.y(), b_min.z()));
@@ -2346,8 +2352,8 @@ void Selection::render_sidebar_layers_hints(const std::string& sidebar_field)
 
         GLModel::Geometry init_data;
         init_data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3, GLModel::Geometry::EIndexType::USHORT };
-        init_data.vertices.reserve(4 * GLModel::Geometry::vertex_stride_floats(init_data.format));
-        init_data.indices.reserve(6 * GLModel::Geometry::index_stride_bytes(init_data.format));
+        init_data.reserve_vertices(4);
+        init_data.reserve_indices(6);
 
         // vertices
         init_data.add_vertex(Vec3f(p1.x(), p1.y(), z1));
@@ -2368,8 +2374,8 @@ void Selection::render_sidebar_layers_hints(const std::string& sidebar_field)
 
         GLModel::Geometry init_data;
         init_data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3, GLModel::Geometry::EIndexType::USHORT };
-        init_data.vertices.reserve(4 * GLModel::Geometry::vertex_stride_floats(init_data.format));
-        init_data.indices.reserve(6 * GLModel::Geometry::index_stride_bytes(init_data.format));
+        init_data.reserve_vertices(4);
+        init_data.reserve_indices(6);
 
         // vertices
         init_data.add_vertex(Vec3f(p1.x(), p1.y(), z2));
diff --git a/src/slic3r/GUI/Tab.cpp b/src/slic3r/GUI/Tab.cpp
index 4f19ad806..b97b6cc39 100644
--- a/src/slic3r/GUI/Tab.cpp
+++ b/src/slic3r/GUI/Tab.cpp
@@ -2324,6 +2324,7 @@ void TabPrinter::build_fff()
         option = optgroup->get_option("thumbnails");
         option.opt.full_width = true;
         optgroup->append_single_option_line(option);
+        optgroup->append_single_option_line("thumbnails_format");
 
         optgroup->append_single_option_line("silent_mode");
         optgroup->append_single_option_line("remaining_times");
@@ -2517,6 +2518,11 @@ void TabPrinter::build_sla()
     optgroup->append_single_option_line("min_initial_exposure_time");
     optgroup->append_single_option_line("max_initial_exposure_time");
 
+
+    optgroup = page->new_optgroup(L("Output"));
+    optgroup->append_single_option_line("sla_archive_format");
+    optgroup->append_single_option_line("sla_output_precision");
+
     build_print_host_upload_group(page.get());
 
     const int notes_field_height = 25; // 250
@@ -4106,7 +4112,10 @@ wxSizer* TabPrint::create_manage_substitution_widget(wxWindow* parent)
     });
 
     create_btn(&m_del_all_substitutions_btn, _L("Delete all"), "cross");
-    m_del_all_substitutions_btn->Bind(wxEVT_BUTTON, [this](wxCommandEvent e) {
+    m_del_all_substitutions_btn->Bind(wxEVT_BUTTON, [this, parent](wxCommandEvent e) {
+        if (MessageDialog(parent, _L("Are you sure you want to delete all substitutions?"), SLIC3R_APP_NAME, wxYES_NO | wxICON_QUESTION).
+            ShowModal() != wxID_YES)
+            return;
         m_subst_manager.delete_all();
         m_del_all_substitutions_btn->Hide();
     });
diff --git a/src/slic3r/GUI/UnsavedChangesDialog.cpp b/src/slic3r/GUI/UnsavedChangesDialog.cpp
index d49b4b1d3..b3b0c15b4 100644
--- a/src/slic3r/GUI/UnsavedChangesDialog.cpp
+++ b/src/slic3r/GUI/UnsavedChangesDialog.cpp
@@ -656,6 +656,7 @@ void DiffViewCtrl::Clear()
 {
     model->Clear();
     m_items_map.clear();
+    m_has_long_strings = false;
 }
 
 wxString DiffViewCtrl::get_short_string(wxString full_string)
@@ -1030,7 +1031,7 @@ bool UnsavedChangesDialog::save(PresetCollection* dependent_presets, bool show_s
 wxString get_string_from_enum(const std::string& opt_key, const DynamicPrintConfig& config, bool is_infill = false)
 {
     const ConfigOptionDef& def = config.def()->options.at(opt_key);
-    const std::vector<std::string>& names = def.enum_labels;//ConfigOptionEnum<T>::get_enum_names();
+    const std::vector<std::string>& names = def.enum_labels.empty() ? def.enum_values : def.enum_labels;
     int val = config.option(opt_key)->getInt();
 
     // Each infill doesn't use all list of infill declared in PrintConfig.hpp.
@@ -1523,8 +1524,8 @@ DiffPresetDialog::DiffPresetDialog(MainFrame* mainframe)
     topSizer->Add(m_top_info_line, 0, wxEXPAND | wxLEFT | wxTOP | wxRIGHT, 2 * border);
     topSizer->Add(presets_sizer, 0, wxEXPAND | wxLEFT | wxTOP | wxRIGHT, border);
     topSizer->Add(m_show_all_presets, 0, wxEXPAND | wxALL, border);
-    topSizer->Add(m_bottom_info_line, 0, wxEXPAND | wxALL, 2 * border);
     topSizer->Add(m_tree, 1, wxEXPAND | wxALL, border);
+    topSizer->Add(m_bottom_info_line, 0, wxEXPAND | wxALL, 2 * border);
 
     this->SetMinSize(wxSize(80 * em, 30 * em));
     this->SetSizer(topSizer);
@@ -1689,12 +1690,17 @@ void DiffPresetDialog::update_tree()
                 left_val, right_val, category_icon_map.at(option.category));
         }
     }
+    
+    if (m_tree->has_long_strings())
+        bottom_info = _L("Some fields are too long to fit. Right mouse click reveals the full text.");
 
     bool tree_was_shown = m_tree->IsShown();
     m_tree->Show(show_tree);
-    if (!show_tree)
+
+    bool show_bottom_info = !show_tree || m_tree->has_long_strings();
+    if (show_bottom_info)
         m_bottom_info_line->SetLabel(bottom_info);
-    m_bottom_info_line->Show(!show_tree);
+    m_bottom_info_line->Show(show_bottom_info);
 
     if (tree_was_shown == m_tree->IsShown())
         Layout();
diff --git a/src/slic3r/Utils/FontManager.cpp b/src/slic3r/Utils/FontManager.cpp
index bcb7c8d8a..5f5dcd315 100644
--- a/src/slic3r/Utils/FontManager.cpp
+++ b/src/slic3r/Utils/FontManager.cpp
@@ -375,8 +375,8 @@ void FontManager::create_texture(size_t index, const std::string &text, GLuint&
     bb2.scale(scale);
     tex_size.x       = bb2.max.x() - bb2.min.x();
     tex_size.y       = bb2.max.y() - bb2.min.y();
-    sla::RasterBase::Resolution resolution(tex_size.x,tex_size.y);
-    sla::RasterBase::PixelDim   dim(1/scale, 1/scale);
+    sla::Resolution resolution(tex_size.x,tex_size.y);
+    sla::PixelDim   dim(1/scale, 1/scale);
     const double no_gamma = 1.;
     std::unique_ptr<sla::RasterBase> r =
         sla::create_raster_grayscale_aa(resolution, dim, no_gamma);
@@ -472,8 +472,8 @@ void FontManager::init_style_images(int max_width) {
     for (Item &item : m_font_list) {        
         double scale = item.font_item.prop.size_in_mm;
         StyleImage &image = *item.image;
-        sla::RasterBase::Resolution resolution(image.tex_size.x, image.tex_size.y);
-        sla::RasterBase::PixelDim dim(1 / scale, 1 / scale);
+        sla::Resolution resolution(image.tex_size.x, image.tex_size.y);
+        sla::PixelDim dim(1 / scale, 1 / scale);
         double gamma = 1.;
         std::unique_ptr<sla::RasterBase> r = sla::create_raster_grayscale_aa(resolution, dim, gamma);
         size_t index = &item - &m_font_list.front();
diff --git a/src/slic3r/Utils/UndoRedo.cpp b/src/slic3r/Utils/UndoRedo.cpp
index 049de5400..533c544a8 100644
--- a/src/slic3r/Utils/UndoRedo.cpp
+++ b/src/slic3r/Utils/UndoRedo.cpp
@@ -21,6 +21,10 @@
 #include <libslic3r/ObjectID.hpp>
 #include <libslic3r/Utils.hpp>
 
+#if ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+#include "slic3r/GUI/3DScene.hpp"
+#endif // ENABLE_GLINDEXEDVERTEXARRAY_REMOVAL
+
 #include <boost/foreach.hpp>
 
 #ifndef NDEBUG
diff --git a/tests/catch_main.hpp b/tests/catch_main.hpp
index 5ab71fdd7..ca5b47da8 100644
--- a/tests/catch_main.hpp
+++ b/tests/catch_main.hpp
@@ -3,7 +3,7 @@
 
 #define CATCH_CONFIG_EXTERNAL_INTERFACES
 #define CATCH_CONFIG_MAIN
-#define CATCH_CONFIG_DEFAULT_REPORTER "verboseconsole"
+// #define CATCH_CONFIG_DEFAULT_REPORTER "verboseconsole"
 #include <catch2/catch.hpp>
 
 namespace Catch {
diff --git a/tests/libslic3r/test_marchingsquares.cpp b/tests/libslic3r/test_marchingsquares.cpp
index 3553697ac..32b137175 100644
--- a/tests/libslic3r/test_marchingsquares.cpp
+++ b/tests/libslic3r/test_marchingsquares.cpp
@@ -20,17 +20,17 @@
 
 using namespace Slic3r;
 
-static double area(const sla::RasterBase::PixelDim &pxd)
+static double area(const sla::PixelDim &pxd)
 {
     return pxd.w_mm * pxd.h_mm;
 }
 
 static Slic3r::sla::RasterGrayscaleAA create_raster(
-    const sla::RasterBase::Resolution &res,
+    const sla::Resolution &res,
     double                             disp_w = 100.,
     double                             disp_h = 100.)
 {
-    sla::RasterBase::PixelDim pixdim{disp_w / res.width_px, disp_h / res.height_px};
+    sla::PixelDim pixdim{disp_w / res.width_px, disp_h / res.height_px};
     
     auto bb = BoundingBox({0, 0}, {scaled(disp_w), scaled(disp_h)});
     sla::RasterBase::Trafo trafo;
@@ -107,7 +107,7 @@ static void test_expolys(Rst &&             rst,
     svg.Close();
     
     double max_rel_err = 0.1;
-    sla::RasterBase::PixelDim pxd = rst.pixel_dimensions();
+    sla::PixelDim pxd = rst.pixel_dimensions();
     double max_abs_err = area(pxd) * scaled(1.) * scaled(1.);
     
     BoundingBox ref_bb;
@@ -175,7 +175,7 @@ TEST_CASE("Fully covered raster should result in a rectangle", "[MarchingSquares
 
 TEST_CASE("4x4 raster with one ring", "[MarchingSquares]") {
     
-    sla::RasterBase::PixelDim pixdim{1, 1};
+    sla::PixelDim pixdim{1, 1};
     
     // We need one additional row and column to detect edges
     sla::RasterGrayscaleAA rst{{4, 4}, pixdim, {}, agg::gamma_threshold(.5)};
@@ -205,7 +205,7 @@ TEST_CASE("4x4 raster with one ring", "[MarchingSquares]") {
 
 TEST_CASE("4x4 raster with two rings", "[MarchingSquares]") {
     
-    sla::RasterBase::PixelDim pixdim{1, 1};
+    sla::PixelDim pixdim{1, 1};
     
     // We need one additional row and column to detect edges
     sla::RasterGrayscaleAA rst{{5, 5}, pixdim, {}, agg::gamma_threshold(.5)};
@@ -321,7 +321,7 @@ static void recreate_object_from_rasters(const std::string &objname, float lh) {
     
     std::vector<ExPolygons> layers = slice_mesh_ex(mesh.its, grid(float(bb.min.z()) + lh, float(bb.max.z()), lh));
     
-    sla::RasterBase::Resolution res{2560, 1440};
+    sla::Resolution res{2560, 1440};
     double                      disp_w = 120.96;
     double                      disp_h = 68.04;
 
diff --git a/tests/libslic3r/test_png_io.cpp b/tests/libslic3r/test_png_io.cpp
index b4fcd6255..e8229b716 100644
--- a/tests/libslic3r/test_png_io.cpp
+++ b/tests/libslic3r/test_png_io.cpp
@@ -9,9 +9,9 @@
 
 using namespace Slic3r;
 
-static sla::RasterGrayscaleAA create_raster(const sla::RasterBase::Resolution &res)
+static sla::RasterGrayscaleAA create_raster(const sla::Resolution &res)
 {
-    sla::RasterBase::PixelDim pixdim{1., 1.};
+    sla::PixelDim pixdim{1., 1.};
 
     auto bb = BoundingBox({0, 0}, {scaled(1.), scaled(1.)});
     sla::RasterBase::Trafo trafo;
diff --git a/tests/sla_print/sla_print_tests.cpp b/tests/sla_print/sla_print_tests.cpp
index db8c5e93e..f7b0df339 100644
--- a/tests/sla_print/sla_print_tests.cpp
+++ b/tests/sla_print/sla_print_tests.cpp
@@ -159,8 +159,8 @@ TEST_CASE("FloorSupportsDoNotPierceModel", "[SLASupportGeneration]") {
 
 TEST_CASE("InitializedRasterShouldBeNONEmpty", "[SLARasterOutput]") {
     // Default Prusa SL1 display parameters
-    sla::RasterBase::Resolution res{2560, 1440};
-    sla::RasterBase::PixelDim   pixdim{120. / res.width_px, 68. / res.height_px};
+    sla::Resolution res{2560, 1440};
+    sla::PixelDim   pixdim{120. / res.width_px, 68. / res.height_px};
     
     sla::RasterGrayscaleAAGammaPower raster(res, pixdim, {}, 1.);
     REQUIRE(raster.resolution().width_px == res.width_px);
@@ -186,8 +186,8 @@ TEST_CASE("MirroringShouldBeCorrect", "[SLARasterOutput]") {
 
 TEST_CASE("RasterizedPolygonAreaShouldMatch", "[SLARasterOutput]") {
     double disp_w = 120., disp_h = 68.;
-    sla::RasterBase::Resolution res{2560, 1440};
-    sla::RasterBase::PixelDim pixdim{disp_w / res.width_px, disp_h / res.height_px};
+    sla::Resolution res{2560, 1440};
+    sla::PixelDim pixdim{disp_w / res.width_px, disp_h / res.height_px};
     
     double gamma = 1.;
     sla::RasterGrayscaleAAGammaPower raster(res, pixdim, {}, gamma);
diff --git a/tests/sla_print/sla_test_utils.cpp b/tests/sla_print/sla_test_utils.cpp
index 1082df200..d98a92037 100644
--- a/tests/sla_print/sla_test_utils.cpp
+++ b/tests/sla_print/sla_test_utils.cpp
@@ -307,8 +307,8 @@ void check_validity(const TriangleMesh &input_mesh, int flags)
 void check_raster_transformations(sla::RasterBase::Orientation o, sla::RasterBase::TMirroring mirroring)
 {
     double disp_w = 120., disp_h = 68.;
-    sla::RasterBase::Resolution res{2560, 1440};
-    sla::RasterBase::PixelDim pixdim{disp_w / res.width_px, disp_h / res.height_px};
+    sla::Resolution res{2560, 1440};
+    sla::PixelDim pixdim{disp_w / res.width_px, disp_h / res.height_px};
     
     auto bb = BoundingBox({0, 0}, {scaled(disp_w), scaled(disp_h)});
     sla::RasterBase::Trafo trafo{o, mirroring};
@@ -400,7 +400,7 @@ double raster_white_area(const sla::RasterGrayscaleAA &raster)
     return a;
 }
 
-double predict_error(const ExPolygon &p, const sla::RasterBase::PixelDim &pd)
+double predict_error(const ExPolygon &p, const sla::PixelDim &pd)
 {
     auto lines = p.lines();
     double pix_err = pixel_area(FullWhite, pd)  / 2.;
diff --git a/tests/sla_print/sla_test_utils.hpp b/tests/sla_print/sla_test_utils.hpp
index 2264ad856..7171914d4 100644
--- a/tests/sla_print/sla_test_utils.hpp
+++ b/tests/sla_print/sla_test_utils.hpp
@@ -175,7 +175,7 @@ void check_raster_transformations(sla::RasterBase::Orientation o,
 
 ExPolygon square_with_hole(double v);
 
-inline double pixel_area(TPixel px, const sla::RasterBase::PixelDim &pxdim)
+inline double pixel_area(TPixel px, const sla::PixelDim &pxdim)
 {
     return (pxdim.h_mm * pxdim.w_mm) * px * 1. / (FullWhite - FullBlack);
 }
@@ -183,7 +183,7 @@ inline double pixel_area(TPixel px, const sla::RasterBase::PixelDim &pxdim)
 double raster_white_area(const sla::RasterGrayscaleAA &raster);
 long raster_pxsum(const sla::RasterGrayscaleAA &raster);
 
-double predict_error(const ExPolygon &p, const sla::RasterBase::PixelDim &pd);
+double predict_error(const ExPolygon &p, const sla::PixelDim &pd);
 
 sla::SupportPoints calc_support_pts(
     const TriangleMesh &                      mesh,
diff --git a/version.inc b/version.inc
index b976d7d67..93b376323 100644
--- a/version.inc
+++ b/version.inc
@@ -3,7 +3,7 @@
 
 set(SLIC3R_APP_NAME "PrusaSlicer")
 set(SLIC3R_APP_KEY "PrusaSlicer")
-set(SLIC3R_VERSION "2.4.1-beta1")
+set(SLIC3R_VERSION "2.5.0-alpha0")
 set(SLIC3R_BUILD_ID "PrusaSlicer-${SLIC3R_VERSION}+UNKNOWN")
-set(SLIC3R_RC_VERSION "2,4,1,0")
-set(SLIC3R_RC_VERSION_DOTS "2.4.1.0")
+set(SLIC3R_RC_VERSION "2,5,0,0")
+set(SLIC3R_RC_VERSION_DOTS "2.5.0.0")
diff --git a/xs/CMakeLists.txt b/xs/CMakeLists.txt
index 962e2e04d..06fc98322 100644
--- a/xs/CMakeLists.txt
+++ b/xs/CMakeLists.txt
@@ -208,5 +208,45 @@ if (MSVC)
 else ()
     set(PERL_PROVE "${PERL_BIN_PATH}/prove")
 endif ()
-add_test (NAME xs COMMAND "${PERL_EXECUTABLE}" ${PERL_PROVE} -I ${PERL_LOCAL_LIB_DIR}/lib/perl5 WORKING_DIRECTORY ${PROJECT_SOURCE_DIR})
-add_test (NAME integration COMMAND "${PERL_EXECUTABLE}" ${PERL_PROVE} WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/..)
+
+set(PERL_ENV_VARS "")
+if (CMAKE_SYSTEM_NAME STREQUAL "Linux" AND NOT CMAKE_CROSSCOMPILING AND ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang"))
+    if (SLIC3R_ASAN OR SLIC3R_UBSAN)
+        set(PERL_ENV_VARS env)
+    endif ()
+
+    if (SLIC3R_ASAN)
+        # Find the location of libasan.so for passing it into LD_PRELOAD. It works with GCC and Clang on Linux.
+        # On Centos 7 calling "gcc -print-file-name=libasan.so" returns path to "ld script" instead of path to shared library.
+        set(_asan_compiled_bin ${CMAKE_CURRENT_BINARY_DIR}/detect_libasan)
+        set(_asan_source_file ${_asan_compiled_bin}.c)
+        # Compile and link simple C application with enabled address sanitizer.
+        file(WRITE ${_asan_source_file} "int main(){}")
+        include(GetPrerequisites)
+        execute_process(COMMAND ${CMAKE_C_COMPILER} ${_asan_source_file} -fsanitize=address -lasan -o ${_asan_compiled_bin})
+        # Extract from the compiled application absolute path of libasan.
+        get_prerequisites(${_asan_compiled_bin} _asan_shared_libraries_list 0 0 "" "")
+        list(FILTER _asan_shared_libraries_list INCLUDE REGEX libasan)
+        set(PERL_ENV_VARS ${PERL_ENV_VARS} "LD_PRELOAD=${_asan_shared_libraries_list}")
+
+        # Suppressed memory leak reports that come from Perl.
+        set(PERL_LEAK_SUPPRESSION_FILE ${CMAKE_CURRENT_BINARY_DIR}/leak_suppression.txt)
+        file(WRITE ${PERL_LEAK_SUPPRESSION_FILE}
+                "leak:Perl_safesysmalloc\n"
+                "leak:Perl_safesyscalloc\n"
+                "leak:Perl_safesysrealloc\n"
+                "leak:__newlocale\n")
+
+        # Suppress a few memory leak reports and disable informing about suppressions.
+        # Print reports about memory leaks but exit with zero exit code when any memory leaks is found to make unit tests pass.
+        set(PERL_ENV_VARS ${PERL_ENV_VARS} "LSAN_OPTIONS=suppressions=${PERL_LEAK_SUPPRESSION_FILE}:print_suppressions=0:exitcode=0")
+    endif ()
+
+    if (SLIC3R_UBSAN)
+        # Do not show full stacktrace for reports from UndefinedBehaviorSanitizer in Perl tests.
+        set(PERL_ENV_VARS ${PERL_ENV_VARS} "UBSAN_OPTIONS=print_stacktrace=0")
+    endif ()
+endif ()
+
+add_test (NAME xs COMMAND ${PERL_ENV_VARS} "${PERL_EXECUTABLE}" ${PERL_PROVE} -I ${PERL_LOCAL_LIB_DIR}/lib/perl5 WORKING_DIRECTORY ${PROJECT_SOURCE_DIR})
+add_test (NAME integration COMMAND ${PERL_ENV_VARS} "${PERL_EXECUTABLE}" ${PERL_PROVE} WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/..)