diff --git a/src/libslic3r/CMakeLists.txt b/src/libslic3r/CMakeLists.txt
index 1a58bdbbd..1605c52cd 100644
--- a/src/libslic3r/CMakeLists.txt
+++ b/src/libslic3r/CMakeLists.txt
@@ -147,6 +147,10 @@ add_library(libslic3r STATIC
     PolygonTrimmer.hpp
     Polyline.cpp
     Polyline.hpp
+    Preset.cpp
+    Preset.hpp
+    PresetBundle.cpp
+    PresetBundle.hpp
     Print.cpp
     Print.hpp
     PrintBase.cpp
diff --git a/src/slic3r/GUI/Preset.cpp b/src/libslic3r/Preset.cpp
similarity index 99%
rename from src/slic3r/GUI/Preset.cpp
rename to src/libslic3r/Preset.cpp
index 883dc438a..e46cd6c82 100644
--- a/src/slic3r/GUI/Preset.cpp
+++ b/src/libslic3r/Preset.cpp
@@ -1,8 +1,7 @@
 #include <cassert>
 
 #include "Preset.hpp"
-#include "AppConfig.hpp"
-#include "I18N.hpp"
+#include "slic3r/GUI/AppConfig.hpp"
 
 #ifdef _MSC_VER
     #define WIN32_LEAN_AND_MEAN
@@ -10,6 +9,16 @@
     #include <Windows.h>
 #endif /* _MSC_VER */
 
+// instead of #include "slic3r/GUI/I18N.hpp" :
+#ifndef L
+// !!! If you needed to translate some string,
+// !!! please use _L(string)
+// !!! _() - is a standard wxWidgets macro to translate
+// !!! L() is used only for marking localizable string 
+// !!! It will be used in "xgettext" to create a Locating Message Catalog.
+#define L(s) s
+#endif /* L */
+
 #include <algorithm>
 #include <fstream>
 #include <stdexcept>
@@ -28,9 +37,9 @@
 #include <boost/locale.hpp>
 #include <boost/log/trivial.hpp>
 
-#include "libslic3r/libslic3r.h"
-#include "libslic3r/Utils.hpp"
-#include "libslic3r/PlaceholderParser.hpp"
+#include "libslic3r.h"
+#include "Utils.hpp"
+#include "PlaceholderParser.hpp"
 
 using boost::property_tree::ptree;
 
@@ -237,9 +246,9 @@ const std::string& Preset::suffix_modified()
     return g_suffix_modified;
 }
 
-void Preset::update_suffix_modified()
+void Preset::update_suffix_modified(const std::string& new_suffix_modified)
 {
-    g_suffix_modified = (" (" + _(L("modified")) + ")").ToUTF8().data();
+    g_suffix_modified = new_suffix_modified;
 }
 // Remove an optional "(modified)" suffix from a name.
 // This converts a UI name to a unique preset identifier.
diff --git a/src/slic3r/GUI/Preset.hpp b/src/libslic3r/Preset.hpp
similarity index 99%
rename from src/slic3r/GUI/Preset.hpp
rename to src/libslic3r/Preset.hpp
index 8a8fa024b..b0af2f142 100644
--- a/src/slic3r/GUI/Preset.hpp
+++ b/src/libslic3r/Preset.hpp
@@ -8,16 +8,8 @@
 #include <boost/filesystem/path.hpp>
 #include <boost/property_tree/ptree_fwd.hpp>
 
-#include "libslic3r/libslic3r.h"
-#include "libslic3r/PrintConfig.hpp"
-#include "libslic3r/Semver.hpp"
-
-class wxBitmap;
-class wxBitmapComboBox;
-class wxChoice;
-class wxItemContainer;
-class wxString;
-class wxWindow;
+#include "PrintConfig.hpp"
+#include "Semver.hpp"
 
 namespace Slic3r {
 
@@ -231,7 +223,7 @@ public:
     static const std::vector<std::string>&  sla_material_options();
     static const std::vector<std::string>&  sla_print_options();
 
-	static void                             update_suffix_modified();
+	static void                             update_suffix_modified(const std::string& new_suffix_modified);
     static const std::string&               suffix_modified();
     static std::string                      remove_suffix_modified(const std::string& name);
     static void                             normalize(DynamicPrintConfig &config);
diff --git a/src/slic3r/GUI/PresetBundle.cpp b/src/libslic3r/PresetBundle.cpp
similarity index 99%
rename from src/slic3r/GUI/PresetBundle.cpp
rename to src/libslic3r/PresetBundle.cpp
index 024884b00..9da7731a4 100644
--- a/src/slic3r/GUI/PresetBundle.cpp
+++ b/src/libslic3r/PresetBundle.cpp
@@ -1,7 +1,9 @@
 #include <cassert>
 
 #include "PresetBundle.hpp"
-#include "Plater.hpp"
+#include "libslic3r.h"
+#include "Utils.hpp"
+#include "Model.hpp"
 
 #include <algorithm>
 #include <set>
@@ -19,14 +21,6 @@
 #include <boost/locale.hpp>
 #include <boost/log/trivial.hpp>
 
-#include <wx/image.h>
-
-#include "libslic3r/libslic3r.h"
-#include "libslic3r/Utils.hpp"
-#include "libslic3r/Model.hpp"
-#include "GUI_App.hpp"
-#include "libslic3r/CustomGCode.hpp"
-
 
 // Store the print/filament/printer presets into a "presets" subdirectory of the Slic3rPE config dir.
 // This breaks compatibility with the upstream Slic3r if the --datadir is used to switch between the two versions.
@@ -49,9 +43,6 @@ PresetBundle::PresetBundle() :
     sla_prints(Preset::TYPE_SLA_PRINT, Preset::sla_print_options(), static_cast<const SLAPrintObjectConfig&>(SLAFullPrintConfig::defaults())),
     printers(Preset::TYPE_PRINTER, Preset::printer_options(), static_cast<const HostConfig&>(FullPrintConfig::defaults()), "- default FFF -")
 {
-    if (wxImage::FindHandler(wxBITMAP_TYPE_PNG) == nullptr)
-        wxImage::AddHandler(new wxPNGHandler);
-
     // The following keys are handled by the UI, they do not have a counterpart in any StaticPrintConfig derived classes,
     // therefore they need to be handled differently. As they have no counterpart in StaticPrintConfig, they are not being
     // initialized based on PrintConfigDef(), but to empty values (zeros, empty vectors, empty strings).
@@ -822,8 +813,6 @@ void PresetBundle::load_config_file_config(const std::string &name_or_path, bool
         // 4) Load the project config values (the per extruder wipe matrix etc).
         this->project_config.apply_only(config, s_project_options);
 
-        CustomGCode::update_custom_gcode_per_print_z_from_config(GUI::wxGetApp().plater()->model().custom_gcode_per_print_z, &this->project_config);
-
         break;
     }
     case ptSLA:
diff --git a/src/slic3r/GUI/PresetBundle.hpp b/src/libslic3r/PresetBundle.hpp
similarity index 99%
rename from src/slic3r/GUI/PresetBundle.hpp
rename to src/libslic3r/PresetBundle.hpp
index 7d137bb7a..19d4093d6 100644
--- a/src/slic3r/GUI/PresetBundle.hpp
+++ b/src/libslic3r/PresetBundle.hpp
@@ -1,14 +1,13 @@
 #ifndef slic3r_PresetBundle_hpp_
 #define slic3r_PresetBundle_hpp_
 
-#include "AppConfig.hpp"
 #include "Preset.hpp"
 
 #include <memory>
 #include <unordered_map>
 #include <boost/filesystem/path.hpp>
 
-class wxWindow;
+#include "slic3r/GUI/AppConfig.hpp"
 
 namespace Slic3r {
 
diff --git a/src/slic3r/CMakeLists.txt b/src/slic3r/CMakeLists.txt
index 98389e7da..49e069285 100644
--- a/src/slic3r/CMakeLists.txt
+++ b/src/slic3r/CMakeLists.txt
@@ -61,10 +61,6 @@ set(SLIC3R_GUI_SOURCES
     GUI/GLToolbar.cpp
     GUI/Preferences.cpp
     GUI/Preferences.hpp
-    GUI/Preset.cpp
-    GUI/Preset.hpp
-    GUI/PresetBundle.cpp
-    GUI/PresetBundle.hpp
     GUI/PresetHints.cpp
     GUI/PresetHints.hpp
     GUI/GUI.cpp
diff --git a/src/slic3r/Config/Snapshot.cpp b/src/slic3r/Config/Snapshot.cpp
index 2264afa7d..f7d313418 100644
--- a/src/slic3r/Config/Snapshot.cpp
+++ b/src/slic3r/Config/Snapshot.cpp
@@ -1,6 +1,5 @@
 #include "Snapshot.hpp"
 #include "../GUI/AppConfig.hpp"
-#include "../GUI/PresetBundle.hpp"
 
 #include <time.h>
 
@@ -11,7 +10,7 @@
 #include <boost/property_tree/ptree_fwd.hpp>
 #include <boost/filesystem/operations.hpp>
 
-
+#include "libslic3r/PresetBundle.hpp"
 #include "libslic3r/libslic3r.h"
 #include "libslic3r/Time.hpp"
 #include "libslic3r/Config.hpp"
diff --git a/src/slic3r/GUI/3DBed.cpp b/src/slic3r/GUI/3DBed.cpp
index 6c070ca99..f2f9f6301 100644
--- a/src/slic3r/GUI/3DBed.cpp
+++ b/src/slic3r/GUI/3DBed.cpp
@@ -7,7 +7,7 @@
 #include "libslic3r/BoundingBox.hpp"
 
 #include "GUI_App.hpp"
-#include "PresetBundle.hpp"
+#include "libslic3r/PresetBundle.hpp"
 #include "GLCanvas3D.hpp"
 
 #include <GL/glew.h>
diff --git a/src/slic3r/GUI/ConfigManipulation.cpp b/src/slic3r/GUI/ConfigManipulation.cpp
index a0df4c659..cd8463a77 100644
--- a/src/slic3r/GUI/ConfigManipulation.cpp
+++ b/src/slic3r/GUI/ConfigManipulation.cpp
@@ -2,7 +2,7 @@
 #include "ConfigManipulation.hpp"
 #include "I18N.hpp"
 #include "GUI_App.hpp"
-#include "PresetBundle.hpp"
+#include "libslic3r/PresetBundle.hpp"
 
 #include <wx/msgdlg.h>
 
diff --git a/src/slic3r/GUI/ConfigWizard_private.hpp b/src/slic3r/GUI/ConfigWizard_private.hpp
index c99c5952b..be2919861 100644
--- a/src/slic3r/GUI/ConfigWizard_private.hpp
+++ b/src/slic3r/GUI/ConfigWizard_private.hpp
@@ -20,9 +20,9 @@
 #include <wx/radiobut.h>
 
 #include "libslic3r/PrintConfig.hpp"
+#include "libslic3r/PresetBundle.hpp"
 #include "slic3r/Utils/PresetUpdater.hpp"
 #include "AppConfig.hpp"
-#include "PresetBundle.hpp"
 #include "BedShapeDialog.hpp"
 #include "GUI.hpp"
 #include "wxExtensions.hpp"
diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index b4e672c4f..b5cd9fb2a 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -13,11 +13,11 @@
 #include "libslic3r/Utils.hpp"
 #include "libslic3r/Technologies.hpp"
 #include "libslic3r/Tesselate.hpp"
+#include "libslic3r/PresetBundle.hpp"
 #include "slic3r/GUI/3DScene.hpp"
 #include "slic3r/GUI/BackgroundSlicingProcess.hpp"
 #include "slic3r/GUI/GLShader.hpp"
 #include "slic3r/GUI/GUI.hpp"
-#include "slic3r/GUI/PresetBundle.hpp"
 #include "slic3r/GUI/Tab.hpp"
 #include "slic3r/GUI/GUI_Preview.hpp"
 #include "slic3r/GUI/OpenGLManager.hpp"
diff --git a/src/slic3r/GUI/GUI_App.cpp b/src/slic3r/GUI/GUI_App.cpp
index 3c000f62e..157875e70 100644
--- a/src/slic3r/GUI/GUI_App.cpp
+++ b/src/slic3r/GUI/GUI_App.cpp
@@ -31,11 +31,11 @@
 #include "libslic3r/Utils.hpp"
 #include "libslic3r/Model.hpp"
 #include "libslic3r/I18N.hpp"
+#include "libslic3r/PresetBundle.hpp"
 
 #include "GUI.hpp"
 #include "GUI_Utils.hpp"
 #include "AppConfig.hpp"
-#include "PresetBundle.hpp"
 #include "3DScene.hpp"
 #include "MainFrame.hpp"
 #include "Plater.hpp"
@@ -935,7 +935,7 @@ bool GUI_App::load_language(wxString language, bool initial)
     m_imgui->set_language(into_u8(language_info->CanonicalName));
     //FIXME This is a temporary workaround, the correct solution is to switch to "C" locale during file import / export only.
     wxSetlocale(LC_NUMERIC, "C");
-    Preset::update_suffix_modified();
+    Preset::update_suffix_modified((" (" + _L("modified") + ")").ToUTF8().data());
 	return true;
 }
 
diff --git a/src/slic3r/GUI/GUI_App.hpp b/src/slic3r/GUI/GUI_App.hpp
index c2b257f45..23567695c 100644
--- a/src/slic3r/GUI/GUI_App.hpp
+++ b/src/slic3r/GUI/GUI_App.hpp
@@ -3,10 +3,10 @@
 
 #include <memory>
 #include <string>
-#include "Preset.hpp"
 #include "ImGuiWrapper.hpp"
 #include "ConfigWizard.hpp"
 #include "OpenGLManager.hpp"
+#include "libslic3r/Preset.hpp"
 
 #include <wx/app.h>
 #include <wx/colour.h>
diff --git a/src/slic3r/GUI/GUI_ObjectLayers.cpp b/src/slic3r/GUI/GUI_ObjectLayers.cpp
index b1a5512d4..90a725fbf 100644
--- a/src/slic3r/GUI/GUI_ObjectLayers.cpp
+++ b/src/slic3r/GUI/GUI_ObjectLayers.cpp
@@ -3,7 +3,7 @@
 
 #include "OptionsGroup.hpp"
 #include "GUI_App.hpp"
-#include "PresetBundle.hpp"
+#include "libslic3r/PresetBundle.hpp"
 #include "libslic3r/Model.hpp"
 #include "GLCanvas3D.hpp"
 #include "Plater.hpp"
diff --git a/src/slic3r/GUI/GUI_ObjectList.cpp b/src/slic3r/GUI/GUI_ObjectList.cpp
index 2f201180a..b87565b03 100644
--- a/src/slic3r/GUI/GUI_ObjectList.cpp
+++ b/src/slic3r/GUI/GUI_ObjectList.cpp
@@ -1,4 +1,5 @@
 #include "libslic3r/libslic3r.h"
+#include "libslic3r/PresetBundle.hpp"
 #include "GUI_ObjectList.hpp"
 #include "GUI_ObjectManipulation.hpp"
 #include "GUI_ObjectLayers.hpp"
@@ -7,7 +8,6 @@
 #include "Plater.hpp"
 
 #include "OptionsGroup.hpp"
-#include "PresetBundle.hpp"
 #include "Tab.hpp"
 #include "wxExtensions.hpp"
 #include "libslic3r/Model.hpp"
diff --git a/src/slic3r/GUI/GUI_ObjectManipulation.cpp b/src/slic3r/GUI/GUI_ObjectManipulation.cpp
index 2c35fc316..7243e8c73 100644
--- a/src/slic3r/GUI/GUI_ObjectManipulation.cpp
+++ b/src/slic3r/GUI/GUI_ObjectManipulation.cpp
@@ -6,7 +6,7 @@
 #include "OptionsGroup.hpp"
 #include "GUI_App.hpp"
 #include "wxExtensions.hpp"
-#include "PresetBundle.hpp"
+#include "libslic3r/PresetBundle.hpp"
 #include "libslic3r/Model.hpp"
 #include "libslic3r/Geometry.hpp"
 #include "Selection.hpp"
diff --git a/src/slic3r/GUI/GUI_ObjectSettings.cpp b/src/slic3r/GUI/GUI_ObjectSettings.cpp
index ef78123a4..398cd51d4 100644
--- a/src/slic3r/GUI/GUI_ObjectSettings.cpp
+++ b/src/slic3r/GUI/GUI_ObjectSettings.cpp
@@ -4,8 +4,8 @@
 #include "OptionsGroup.hpp"
 #include "GUI_App.hpp"
 #include "wxExtensions.hpp"
-#include "PresetBundle.hpp"
 #include "Plater.hpp"
+#include "libslic3r/PresetBundle.hpp"
 #include "libslic3r/Model.hpp"
 
 #include <boost/algorithm/string.hpp>
diff --git a/src/slic3r/GUI/GUI_Preview.cpp b/src/slic3r/GUI/GUI_Preview.cpp
index c1e8b4c33..f068ef37d 100644
--- a/src/slic3r/GUI/GUI_Preview.cpp
+++ b/src/slic3r/GUI/GUI_Preview.cpp
@@ -8,7 +8,7 @@
 #include "BackgroundSlicingProcess.hpp"
 #include "OpenGLManager.hpp"
 #include "GLCanvas3D.hpp"
-#include "PresetBundle.hpp"
+#include "libslic3r/PresetBundle.hpp"
 #include "DoubleSlider.hpp"
 #include "Plater.hpp"
 
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoFdmSupports.cpp b/src/slic3r/GUI/Gizmos/GLGizmoFdmSupports.cpp
index cd4285724..7aa516845 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoFdmSupports.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoFdmSupports.cpp
@@ -6,9 +6,9 @@
 #include <GL/glew.h>
 
 #include "slic3r/GUI/GUI_App.hpp"
-#include "slic3r/GUI/PresetBundle.hpp"
 #include "slic3r/GUI/Camera.hpp"
 #include "slic3r/GUI/Plater.hpp"
+#include "libslic3r/PresetBundle.hpp"
 #include "libslic3r/Model.hpp"
 
 
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoHollow.cpp b/src/slic3r/GUI/Gizmos/GLGizmoHollow.cpp
index 658db64ca..273384da2 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoHollow.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoHollow.cpp
@@ -9,7 +9,7 @@
 #include "slic3r/GUI/GUI_ObjectSettings.hpp"
 #include "slic3r/GUI/GUI_ObjectList.hpp"
 #include "slic3r/GUI/Plater.hpp"
-#include "slic3r/GUI/PresetBundle.hpp"
+#include "libslic3r/PresetBundle.hpp"
 
 #include "libslic3r/Model.hpp"
 
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp b/src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp
index 908fe27b1..2856bb35d 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp
@@ -16,7 +16,7 @@
 #include "slic3r/GUI/GUI_ObjectSettings.hpp"
 #include "slic3r/GUI/GUI_ObjectList.hpp"
 #include "slic3r/GUI/Plater.hpp"
-#include "slic3r/GUI/PresetBundle.hpp"
+#include "libslic3r/PresetBundle.hpp"
 #include "libslic3r/SLAPrint.hpp"
 
 
diff --git a/src/slic3r/GUI/Gizmos/GLGizmosCommon.cpp b/src/slic3r/GUI/Gizmos/GLGizmosCommon.cpp
index 051e9cf88..6742f5cde 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmosCommon.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmosCommon.cpp
@@ -8,7 +8,7 @@
 #include "slic3r/GUI/Camera.hpp"
 #include "slic3r/GUI/Plater.hpp"
 
-#include "slic3r/GUI/PresetBundle.hpp"
+#include "libslic3r/PresetBundle.hpp"
 
 #include <GL/glew.h>
 
diff --git a/src/slic3r/GUI/Gizmos/GLGizmosManager.cpp b/src/slic3r/GUI/Gizmos/GLGizmosManager.cpp
index 511c68735..c33ba2850 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmosManager.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmosManager.cpp
@@ -5,7 +5,6 @@
 #include "slic3r/GUI/Camera.hpp"
 #include "slic3r/GUI/GUI_App.hpp"
 #include "slic3r/GUI/GUI_ObjectManipulation.hpp"
-#include "slic3r/GUI/PresetBundle.hpp"
 #include "slic3r/GUI/Plater.hpp"
 #include "slic3r/Utils/UndoRedo.hpp"
 
@@ -19,6 +18,7 @@
 #include "slic3r/GUI/Gizmos/GLGizmoHollow.hpp"
 
 #include "libslic3r/Model.hpp"
+#include "libslic3r/PresetBundle.hpp"
 
 #include <wx/glcanvas.h>
 
diff --git a/src/slic3r/GUI/I18N.hpp b/src/slic3r/GUI/I18N.hpp
index 25e46930b..7bad6880e 100644
--- a/src/slic3r/GUI/I18N.hpp
+++ b/src/slic3r/GUI/I18N.hpp
@@ -12,7 +12,7 @@
 
 #ifndef L
 // !!! If you needed to translate some wxString,
-// !!! please use _(L(string))
+// !!! please use _L(string)
 // !!! _() - is a standard wxWidgets macro to translate
 // !!! L() is used only for marking localizable string 
 // !!! It will be used in "xgettext" to create a Locating Message Catalog.
diff --git a/src/slic3r/GUI/Jobs/SLAImportJob.cpp b/src/slic3r/GUI/Jobs/SLAImportJob.cpp
index 4e9f08ff2..cc779df2a 100644
--- a/src/slic3r/GUI/Jobs/SLAImportJob.cpp
+++ b/src/slic3r/GUI/Jobs/SLAImportJob.cpp
@@ -4,11 +4,11 @@
 #include "slic3r/GUI/GUI_App.hpp"
 #include "slic3r/GUI/AppConfig.hpp"
 #include "slic3r/GUI/Plater.hpp"
-#include "slic3r/GUI/PresetBundle.hpp"
 #include "slic3r/GUI/GUI_ObjectList.hpp"
 #include "slic3r/Utils/SLAImport.hpp"
 
 #include "libslic3r/Model.hpp"
+#include "libslic3r/PresetBundle.hpp"
 
 #include <wx/dialog.h>
 #include <wx/stattext.h>
diff --git a/src/slic3r/GUI/MainFrame.cpp b/src/slic3r/GUI/MainFrame.cpp
index d4ce21fc0..08caf299b 100644
--- a/src/slic3r/GUI/MainFrame.cpp
+++ b/src/slic3r/GUI/MainFrame.cpp
@@ -15,9 +15,9 @@
 #include "libslic3r/Print.hpp"
 #include "libslic3r/Polygon.hpp"
 #include "libslic3r/SLAPrint.hpp"
+#include "libslic3r/PresetBundle.hpp"
 
 #include "Tab.hpp"
-#include "PresetBundle.hpp"
 #include "ProgressStatusBar.hpp"
 #include "3DScene.hpp"
 #include "AppConfig.hpp"
diff --git a/src/slic3r/GUI/Mouse3DController.cpp b/src/slic3r/GUI/Mouse3DController.cpp
index baa9356b6..91d2414d5 100644
--- a/src/slic3r/GUI/Mouse3DController.cpp
+++ b/src/slic3r/GUI/Mouse3DController.cpp
@@ -1,9 +1,9 @@
 #include "libslic3r/libslic3r.h"
+#include "libslic3r/PresetBundle.hpp"
 #include "Mouse3DController.hpp"
 
 #include "Camera.hpp"
 #include "GUI_App.hpp"
-#include "PresetBundle.hpp"
 #include "AppConfig.hpp"
 #include "GLCanvas3D.hpp"
 #include "Plater.hpp"
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 339badc96..a78683bd4 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -43,6 +43,7 @@
 #include "libslic3r/PrintConfig.hpp"
 #include "libslic3r/SLAPrint.hpp"
 #include "libslic3r/Utils.hpp"
+#include "libslic3r/PresetBundle.hpp"
 
 #include "GUI.hpp"
 #include "GUI_App.hpp"
@@ -65,7 +66,6 @@
 #include "Jobs/ArrangeJob.hpp"
 #include "Jobs/RotoptimizeJob.hpp"
 #include "Jobs/SLAImportJob.hpp"
-#include "PresetBundle.hpp"
 #include "BackgroundSlicingProcess.hpp"
 #include "ProgressStatusBar.hpp"
 #include "PrintHostDialogs.hpp"
@@ -2120,6 +2120,8 @@ std::vector<size_t> Plater::priv::load_files(const std::vector<fs::path>& input_
                     if (!config.empty()) {
                         Preset::normalize(config);
                         wxGetApp().preset_bundle->load_config_model(filename.string(), std::move(config));
+                        if (printer_technology == ptFFF)
+                            CustomGCode::update_custom_gcode_per_print_z_from_config(model.custom_gcode_per_print_z, &wxGetApp().preset_bundle->project_config);
                         wxGetApp().load_current_presets();
                         is_project_file = true;
                     }
diff --git a/src/slic3r/GUI/Plater.hpp b/src/slic3r/GUI/Plater.hpp
index d2acc7632..38fc67982 100644
--- a/src/slic3r/GUI/Plater.hpp
+++ b/src/slic3r/GUI/Plater.hpp
@@ -7,9 +7,9 @@
 
 #include <wx/panel.h>
 
-#include "Preset.hpp"
 #include "Selection.hpp"
 
+#include "libslic3r/Preset.hpp"
 #include "libslic3r/BoundingBox.hpp"
 #include "Jobs/Job.hpp"
 #include "Search.hpp"
diff --git a/src/slic3r/GUI/PresetComboBoxes.cpp b/src/slic3r/GUI/PresetComboBoxes.cpp
index 380edb48a..51b5a0c8d 100644
--- a/src/slic3r/GUI/PresetComboBoxes.cpp
+++ b/src/slic3r/GUI/PresetComboBoxes.cpp
@@ -15,6 +15,7 @@
 
 #include "libslic3r/libslic3r.h"
 #include "libslic3r/PrintConfig.hpp"
+#include "libslic3r/PresetBundle.hpp"
 
 #include "GUI.hpp"
 #include "GUI_App.hpp"
@@ -22,7 +23,6 @@
 #include "MainFrame.hpp"
 #include "format.hpp"
 #include "Tab.hpp"
-#include "PresetBundle.hpp"
 #include "PrintHostDialogs.hpp"
 #include "ConfigWizard.hpp"
 #include "../Utils/ASCIIFolding.hpp"
diff --git a/src/slic3r/GUI/PresetComboBoxes.hpp b/src/slic3r/GUI/PresetComboBoxes.hpp
index 63110e432..3d9a13490 100644
--- a/src/slic3r/GUI/PresetComboBoxes.hpp
+++ b/src/slic3r/GUI/PresetComboBoxes.hpp
@@ -7,7 +7,7 @@
 #include <wx/bmpcbox.h>
 #include <wx/gdicmn.h>
 
-#include "Preset.hpp"
+#include "libslic3r/Preset.hpp"
 #include "wxExtensions.hpp"
 #include "GUI_Utils.hpp"
 
diff --git a/src/slic3r/GUI/PresetHints.cpp b/src/slic3r/GUI/PresetHints.cpp
index 24afeb526..c40c4c6ac 100644
--- a/src/slic3r/GUI/PresetHints.cpp
+++ b/src/slic3r/GUI/PresetHints.cpp
@@ -4,7 +4,6 @@
 #include "libslic3r/Slicing.hpp"
 #include "libslic3r/libslic3r.h"
 
-#include "PresetBundle.hpp"
 #include "PresetHints.hpp"
 
 #include <wx/intl.h> 
diff --git a/src/slic3r/GUI/PresetHints.hpp b/src/slic3r/GUI/PresetHints.hpp
index be049c2c8..a61310f40 100644
--- a/src/slic3r/GUI/PresetHints.hpp
+++ b/src/slic3r/GUI/PresetHints.hpp
@@ -3,7 +3,7 @@
 
 #include <string>
 
-#include "PresetBundle.hpp"
+#include "libslic3r/PresetBundle.hpp"
 
 namespace Slic3r {
 
diff --git a/src/slic3r/GUI/Search.cpp b/src/slic3r/GUI/Search.cpp
index 613a39cce..242e3d725 100644
--- a/src/slic3r/GUI/Search.cpp
+++ b/src/slic3r/GUI/Search.cpp
@@ -9,10 +9,10 @@
 #include "wx/dataview.h"
 
 #include "libslic3r/PrintConfig.hpp"
+#include "libslic3r/PresetBundle.hpp"
 #include "GUI_App.hpp"
 #include "Plater.hpp"
 #include "Tab.hpp"
-#include "PresetBundle.hpp"
 
 #define FTS_FUZZY_MATCH_IMPLEMENTATION
 #include "fts_fuzzy_match.h"
diff --git a/src/slic3r/GUI/Search.hpp b/src/slic3r/GUI/Search.hpp
index 9701e6808..8202222e9 100644
--- a/src/slic3r/GUI/Search.hpp
+++ b/src/slic3r/GUI/Search.hpp
@@ -14,8 +14,8 @@
 #include <wx/dialog.h>
 
 #include "GUI_Utils.hpp"
-#include "Preset.hpp"
 #include "wxExtensions.hpp"
+#include "libslic3r/Preset.hpp"
 
 
 namespace Slic3r {
diff --git a/src/slic3r/GUI/Tab.cpp b/src/slic3r/GUI/Tab.cpp
index b128ec03d..88c11030d 100644
--- a/src/slic3r/GUI/Tab.cpp
+++ b/src/slic3r/GUI/Tab.cpp
@@ -1,8 +1,8 @@
 // #include "libslic3r/GCodeSender.hpp"
 #include "slic3r/Utils/Serial.hpp"
 #include "Tab.hpp"
-#include "PresetBundle.hpp"
 #include "PresetHints.hpp"
+#include "libslic3r/PresetBundle.hpp"
 #include "libslic3r/Utils.hpp"
 #include "libslic3r/Model.hpp"
 
@@ -32,7 +32,6 @@
 
 #include "GUI_App.hpp"
 #include "GUI_ObjectList.hpp"
-#include "ConfigWizard.hpp"
 #include "Plater.hpp"
 #include "MainFrame.hpp"
 #include "format.hpp"
diff --git a/src/slic3r/GUI/Tab.hpp b/src/slic3r/GUI/Tab.hpp
index a0bf536c1..bc15efa35 100644
--- a/src/slic3r/GUI/Tab.hpp
+++ b/src/slic3r/GUI/Tab.hpp
@@ -33,8 +33,8 @@
 #include "Event.hpp"
 #include "wxExtensions.hpp"
 #include "ConfigManipulation.hpp"
-#include "Preset.hpp"
 #include "OptionsGroup.hpp"
+#include "libslic3r/Preset.hpp"
 
 namespace Slic3r {
 namespace GUI {
diff --git a/src/slic3r/Utils/PresetUpdater.cpp b/src/slic3r/Utils/PresetUpdater.cpp
index c32613c46..dec251858 100644
--- a/src/slic3r/Utils/PresetUpdater.cpp
+++ b/src/slic3r/Utils/PresetUpdater.cpp
@@ -19,9 +19,9 @@
 #include "libslic3r/libslic3r.h"
 #include "libslic3r/format.hpp"
 #include "libslic3r/Utils.hpp"
+#include "libslic3r/PresetBundle.hpp"
 #include "slic3r/GUI/GUI.hpp"
 #include "slic3r/GUI/I18N.hpp"
-#include "slic3r/GUI/PresetBundle.hpp"
 #include "slic3r/GUI/UpdateDialogs.hpp"
 #include "slic3r/GUI/ConfigWizard.hpp"
 #include "slic3r/GUI/GUI_App.hpp"