diff --git a/deps/wxWidgets/wxWidgets.cmake b/deps/wxWidgets/wxWidgets.cmake
index bf23698cf..c7facc2c6 100644
--- a/deps/wxWidgets/wxWidgets.cmake
+++ b/deps/wxWidgets/wxWidgets.cmake
@@ -1,11 +1,4 @@
-if (APPLE)
-    # The new OSX 11 (Big Sur) is not compatible with wxWidgets 3.1.3.
-    # Let's use patched wxWidgets 3.1.4, even though it is not quite tested.
-    set(_wx_git_tag v3.1.4-patched)
-else ()
-    # Use the tested patched wxWidgets 3.1.3 everywhere else.
-    set(_wx_git_tag v3.1.3-patched)
-endif ()
+set(_wx_git_tag v3.1.4-patched)
 
 # set(_patch_command "")
 set(_wx_toolkit "")
diff --git a/resources/icons/fuzzy_skin.svg b/resources/icons/fuzzy_skin.svg
new file mode 100644
index 000000000..b8ba0a651
--- /dev/null
+++ b/resources/icons/fuzzy_skin.svg
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 23.0.3, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.0" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 16 16" enable-background="new 0 0 16 16" xml:space="preserve">
+<g>
+	<circle fill="#808080" cx="8" cy="8" r="0"/>
+</g>
+</svg>
diff --git a/resources/profiles/Creality.ini b/resources/profiles/Creality.ini
index 1426ee596..1c11210de 100644
--- a/resources/profiles/Creality.ini
+++ b/resources/profiles/Creality.ini
@@ -41,23 +41,23 @@ bed_model = ender3v2_bed.stl
 bed_texture = ender3v2.svg
 default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
 
-#[printer_model:ENDER3MAX]
-#name = Creality Ender-3 Max
-#variants = 0.4
-#technology = FFF
-#family = ENDER
-#bed_model = cr10v2_bed.stl
-#bed_texture = cr10spro.svg
-#default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
+[printer_model:ENDER3MAX]
+name = Creality Ender-3 Max
+variants = 0.4
+technology = FFF
+family = ENDER
+bed_model = cr10v2_bed.stl
+bed_texture = cr10spro.svg
+default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
 
-#[printer_model:ENDER4]
-#name = Creality Ender-4
-#variants = 0.4
-#technology = FFF
-#family = ENDER
-#bed_model = ender3v2_bed.stl
-#bed_texture = ender3v2.svg
-#default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
+[printer_model:ENDER4]
+name = Creality Ender-4
+variants = 0.4
+technology = FFF
+family = ENDER
+bed_model = ender3v2_bed.stl
+bed_texture = ender3v2.svg
+default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
 
 [printer_model:ENDER5]
 name = Creality Ender-5
@@ -77,14 +77,14 @@ bed_model = ender5plus_bed.stl
 bed_texture = ender5plus.svg
 default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
 
-#[printer_model:ENDER6]
-#name = Creality Ender-6
-#variants = 0.4
-#technology = FFF
-#family = ENDER
-#bed_model = ender6_bed.stl
-#bed_texture = ender6.svg
-#default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
+[printer_model:ENDER6]
+name = Creality Ender-6
+variants = 0.4
+technology = FFF
+family = ENDER
+bed_model = ender6_bed.stl
+bed_texture = ender6.svg
+default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
 
 [printer_model:ENDER2]
 name = Creality Ender-2
@@ -95,23 +95,41 @@ bed_model = ender2_bed.stl
 bed_texture = ender2.svg
 default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
 
-#[printer_model:CR6SE]
-#name = Creality CR-6 SE
-#variants = 0.4
-#technology = FFF
-#family = CR
-#bed_model = cr6se_bed.stl
-#bed_texture = cr6se.svg
-#default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
+[printer_model:CR5PRO]
+name = Creality CR-5 Pro
+variants = 0.4
+technology = FFF
+family = CR
+bed_model = cr5pro_bed.stl
+bed_texture = cr5pro.svg
+default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
 
-#[printer_model:CR6MAX]
-#name = Creality CR-6 Max
-#variants = 0.4
-#technology = FFF
-#family = CR
-#bed_model = cr10s4_bed.stl
-#bed_texture = cr10s4.svg
-#default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
+[printer_model:CR5PROH]
+name = Creality CR-5 Pro H
+variants = 0.4
+technology = FFF
+family = CR
+bed_model = cr5pro_bed.stl
+bed_texture = cr5pro.svg
+default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
+
+[printer_model:CR6SE]
+name = Creality CR-6 SE
+variants = 0.4
+technology = FFF
+family = CR
+bed_model = cr6se_bed.stl
+bed_texture = cr6se.svg
+default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
+
+[printer_model:CR6MAX]
+name = Creality CR-6 Max
+variants = 0.4
+technology = FFF
+family = CR
+bed_model = cr10s4_bed.stl
+bed_texture = cr10s4.svg
+default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
 
 [printer_model:CR10MINI]
 name = Creality CR-10 Mini
@@ -122,14 +140,14 @@ bed_model = cr10mini_bed.stl
 bed_texture = cr10mini.svg
 default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
 
-#[printer_model:CR10MAX]
-#name = Creality CR-10 Max
-#variants = 0.4
-#technology = FFF
-#family = CR
-#bed_model = cr10max_bed.stl
-#bed_texture = cr10max.svg
-#default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
+[printer_model:CR10MAX]
+name = Creality CR-10 Max
+variants = 0.4
+technology = FFF
+family = CR
+bed_model = cr10max_bed.stl
+bed_texture = cr10max.svg
+default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
 
 [printer_model:CR10]
 name = Creality CR-10
@@ -221,14 +239,23 @@ bed_model = ender3_bed.stl
 bed_texture = cr20.svg
 default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
 
-#[printer_model:CR8]
-#name = Creality CR-8
-#variants = 0.4
-#technology = FFF
-#family = CR
-#bed_model = cr8_bed.stl
-#bed_texture = cr8.svg
-#default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
+[printer_model:CR200B]
+name = Creality CR-200B
+variants = 0.4
+technology = FFF
+family = CR
+bed_model = cr200b_bed.stl
+bed_texture = cr200b.svg
+default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
+
+[printer_model:CR8]
+name = Creality CR-8
+variants = 0.4
+technology = FFF
+family = CR
+bed_model = cr8_bed.stl
+bed_texture = cr8.svg
+default_materials = Generic PLA @CREALITY; Generic PETG @CREALITY; Generic ABS @CREALITY; Creality PLA @CREALITY; Prusament PLA @CREALITY; Prusament PETG @CREALITY; AzureFilm PLA @CREALITY; Devil Design PLA @CREALITY; Devil Design PLA (Galaxy) @CREALITY; Extrudr PLA NX2 @CREALITY; Real Filament PLA @CREALITY; Velleman PLA @CREALITY; 3DJAKE ecoPLA @CREALITY; 123-3D Jupiter PLA @CREALITY
 
 #[printer_model:CRX]
 #name = Creality CR-X
@@ -269,11 +296,11 @@ external_perimeters_first = 0
 external_perimeter_extrusion_width = 0.45
 external_perimeter_speed = 25
 extra_perimeters = 0
-extruder_clearance_height = 25
-extruder_clearance_radius = 45
+extruder_clearance_height = 34
+extruder_clearance_radius = 47
 extrusion_width = 0.45
 fill_angle = 45
-fill_density = 20%
+fill_density = 15%
 fill_pattern = grid
 first_layer_extrusion_width = 0.42
 first_layer_height = 0.2
@@ -307,9 +334,9 @@ print_settings_id =
 raft_layers = 0
 resolution = 0
 seam_position = nearest
-single_extruder_multi_material_priming = 1
+single_extruder_multi_material_priming = 0
 skirts = 1
-skirt_distance = 2
+skirt_distance = 3
 skirt_height = 2
 small_perimeter_speed = 25
 solid_infill_below_area = 0
@@ -335,7 +362,7 @@ support_material_pattern = rectilinear
 support_material_spacing = 2
 support_material_speed = 40
 support_material_synchronize_layers = 0
-support_material_threshold = 45
+support_material_threshold = 40
 support_material_with_sheath = 0
 support_material_xy_spacing = 60%
 thin_walls = 0
@@ -359,7 +386,7 @@ top_solid_layers = 11
 
 [print:*0.10mm*]
 inherits = *common*
-layer_height = 0.1
+layer_height = 0.10
 perimeters = 3
 bottom_solid_layers = 7
 top_solid_layers = 9
@@ -712,7 +739,7 @@ printer_technology = FFF
 before_layer_gcode = ;BEFORE_LAYER_CHANGE\nG92 E0\n;[layer_z]\n\n
 between_objects_gcode = 
 pause_print_gcode = 
-deretract_speed = 0
+deretract_speed = 40
 extruder_colour = #FCE94F
 extruder_offset = 0x0
 gcode_flavor = marlin
@@ -735,23 +762,24 @@ machine_max_jerk_z = 0.4
 machine_min_extruding_rate = 0
 machine_min_travel_rate = 0
 layer_gcode = ;AFTER_LAYER_CHANGE\n;[layer_z]
-max_layer_height = 0.3
-min_layer_height = 0.07
+max_layer_height = 0.28
+min_layer_height = 0.08
 max_print_height = 250
 nozzle_diameter = 0.4
 printer_notes = 
 printer_settings_id = 
-retract_before_travel = 1
-retract_before_wipe = 0%
+printer_variant = 0.4
+retract_before_travel = 2
+retract_before_wipe = 70%
 retract_layer_change = 1
-retract_length = 1
+retract_length = 5
 retract_length_toolchange = 1
 retract_lift = 0
 retract_lift_above = 0
 retract_lift_below = 0
 retract_restart_extra = 0
 retract_restart_extra_toolchange = 0
-retract_speed = 35
+retract_speed = 60
 single_extruder_multi_material = 0
 toolchange_gcode = 
 use_firmware_retraction = 0
@@ -763,39 +791,6 @@ z_offset = 0
 printer_model = 
 default_print_profile = 0.16mm OPTIMAL @CREALITY
 default_filament_profile = Generic PLA @CREALITY
-
-[printer:Creality Ender-3]
-inherits = *common*
-renamed_from = "Creality ENDER-3"
-printer_model = ENDER3
-printer_variant = 0.4
-max_layer_height = 0.28
-min_layer_height = 0.08
-printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_ENDER3\nPRINTER_HAS_BOWDEN
-bed_shape = 3x3,228x3,228x228,3x228
-max_print_height = 250
-machine_max_acceleration_e = 5000
-machine_max_acceleration_extruding = 500
-machine_max_acceleration_retracting = 1000
-machine_max_acceleration_x = 500
-machine_max_acceleration_y = 500
-machine_max_acceleration_z = 100
-machine_max_feedrate_e = 60
-machine_max_feedrate_x = 500
-machine_max_feedrate_y = 500
-machine_max_feedrate_z = 10
-machine_max_jerk_e = 5
-machine_max_jerk_x = 8
-machine_max_jerk_y = 8
-machine_max_jerk_z = 0.4
-machine_min_extruding_rate = 0
-machine_min_travel_rate = 0
-nozzle_diameter = 0.4
-retract_before_travel = 2
-retract_length = 5
-retract_speed = 60
-deretract_speed = 40
-retract_before_wipe = 70%
 start_gcode = G90 ; use absolute coordinates\nM83 ; extruder relative mode\nM104 S120 ; set temporary nozzle temp to prevent oozing during homing and auto bed leveling\nM140 S[first_layer_bed_temperature] ; set final bed temp\nG4 S10 ; allow partial nozzle warmup\nG28 ; home all axis\nG1 Z50 F240\nG1 X2 Y10 F3000\nM104 S[first_layer_temperature] ; set final nozzle temp\nM190 S[first_layer_bed_temperature] ; wait for bed temp to stabilize\nM109 S[first_layer_temperature] ; wait for nozzle temp to stabilize\nG1 Z0.28 F240\nG92 E0\nG1 Y140 E10 F1500 ; prime the nozzle\nG1 X2.3 F5000\nG92 E0\nG1 Y10 E10 F1200 ; prime the nozzle\nG92 E0
 end_gcode = {if max_layer_z < max_print_height}G1 Z{z_offset+min(max_layer_z+2, max_print_height)} F600 ; Move print head up{endif}\nG1 X5 Y{print_bed_max[1]*0.8} F{travel_speed*60} ; present print\n{if max_layer_z < max_print_height-10}G1 Z{z_offset+min(max_layer_z+70, max_print_height-10)} F600 ; Move print head further up{endif}\n{if max_layer_z < max_print_height*0.6}G1 Z{max_print_height*0.6} F600 ; Move print head further up{endif}\nM140 S0 ; turn off heatbed\nM104 S0 ; turn off temperature\nM107 ; turn off fan\nM84 X Y E ; disable motors
 
@@ -813,7 +808,6 @@ pause_print_gcode = M25 ; pause print
 
 # Intended for printers where the Z-axis lowers the print bed during printing, like the Ender-5 series
 [printer:*descendingz*]
-renamed_from = "*invertedz*"
 end_gcode = {if max_layer_z < max_print_height}G1 Z{z_offset+min(max_layer_z+2, max_print_height)} F600{endif} ; Move print bed down\nG1 X50 Y50 F{travel_speed*60} ; move print head out of the way\n{if max_layer_z < max_print_height-10}G1 Z{z_offset+max_print_height-10} F600{endif} ; Move print bed close to the bottom\nM140 S0 ; turn off heatbed\nM104 S0 ; turn off temperature\nM107 ; turn off fan\nM84 X Y E ; disable motors
 
 # Intended for printers with dual extruders and a single hotend/nozzle, like the CR-X series
@@ -842,34 +836,44 @@ retract_restart_extra_toolchange = 0,0
 retract_speed = 60,60
 wipe = 1,1
 
+[printer:Creality Ender-3]
+inherits = *common*
+renamed_from = "Creality ENDER-3"
+bed_shape = 3x3,228x3,228x228,3x228
+max_print_height = 250
+printer_model = ENDER3
+printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_ENDER3\nPRINTER_HAS_BOWDEN
+
 [printer:Creality Ender-3 BLTouch]
 inherits = Creality Ender-3; *fastabl*
 renamed_from = "Creality ENDER-3 BLTouch"
 printer_model = ENDER3BLTOUCH
 
 [printer:Creality Ender-3 V2]
-inherits = Creality Ender-3
+inherits = *common*
 renamed_from = "Creality Ender-3V2"
-printer_model = ENDER3V2
 bed_shape = 5x0,215x0,215x220,5x220
+max_print_height = 250
+printer_model = ENDER3V2
+printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_ENDER3V2\nPRINTER_HAS_BOWDEN
 
-#[printer:Creality Ender-3 Max]
-#inherits = Creality Ender-3
-#retract_length = 6
-#bed_shape = 5x5,295x5,295x295,5x295
-#max_print_height = 340
-#printer_model = ENDER3MAX
-#printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_ENDER3MAX\nPRINTER_HAS_BOWDEN
+[printer:Creality Ender-3 Max]
+inherits = *common*
+retract_length = 6
+bed_shape = 5x5,295x5,295x295,5x295
+max_print_height = 340
+printer_model = ENDER3MAX
+printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_ENDER3MAX\nPRINTER_HAS_BOWDEN
 
-#[printer:Creality Ender-4]
-#inherits = Creality Ender-3; *descendingz*
-#bed_shape = 5x0,215x0,215x220,5x220
-#max_print_height = 300
-#printer_model = ENDER4
-#printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_ENDER4\nPRINTER_HAS_BOWDEN
+[printer:Creality Ender-4]
+inherits = *common*; *descendingz*
+bed_shape = 5x0,215x0,215x220,5x220
+max_print_height = 300
+printer_model = ENDER4
+printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_ENDER4\nPRINTER_HAS_BOWDEN
 
 [printer:Creality Ender-5]
-inherits = Creality Ender-3; *descendingz*
+inherits = *common*; *descendingz*
 retract_length = 6
 bed_shape = 5x2.5,225x2.5,225x222.5,5x222.5
 max_print_height = 300
@@ -879,7 +883,7 @@ machine_max_acceleration_e = 1000
 machine_max_feedrate_z = 5
 
 [printer:Creality Ender-5 Plus]
-inherits = Creality Ender-3; *slowabl*; *descendingz*
+inherits = *common*; *slowabl*; *descendingz*
 retract_length = 6
 bed_shape = 5x5,355x5,355x355,5x355
 max_print_height = 400
@@ -890,53 +894,69 @@ machine_max_feedrate_z = 5
 machine_max_feedrate_x = 300
 machine_max_feedrate_y = 300
 
-#[printer:Creality Ender-6]
-#inherits = Creality Ender-3; *descendingz*
-#bed_shape = 5x5,255x5,255x255,5x255
-#max_print_height = 400
-#printer_model = ENDER6
-#printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_ENDER6\nPRINTER_HAS_BOWDEN
+[printer:Creality Ender-6]
+inherits = *common*; *descendingz*
+bed_shape = 5x5,255x5,255x255,5x255
+max_print_height = 400
+printer_model = ENDER6
+printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_ENDER6\nPRINTER_HAS_BOWDEN
 
 [printer:Creality Ender-2]
-inherits = Creality Ender-3
+inherits = *common*
 renamed_from = "Creality ENDER-2"
 bed_shape = 0x0,150x0,150x150,0x150
 max_print_height = 200
 printer_model = ENDER2
 printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_ENDER2\nPRINTER_HAS_BOWDEN
 
-#[printer:Creality CR-6 SE]
-#inherits = Creality Ender-3; *fastabl*; *pauseprint*
-#bed_shape = 5x0,230x0,230x235,5x235
-#printer_model = CR6SE
-#printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR6SE\nPRINTER_HAS_BOWDEN
+[printer:Creality CR-5 Pro]
+inherits = *common*; *slowabl*; *descendingz*
+retract_length = 6
+bed_shape = 5x5,295x5,295x220,5x220
+max_print_height = 380
+printer_model = CR5PRO
+printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR5PRO\nPRINTER_HAS_BOWDEN
 
-#[printer:Creality CR-6 Max]
-#inherits = Creality Ender-3; *slowabl*
-#retract_length = 6
-#bed_shape = 5x5,395x5,395x395,5x395
-#max_print_height = 400
-#printer_model = CR6MAX
-#printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR6MAX\nPRINTER_HAS_BOWDEN
+[printer:Creality CR-5 Pro H]
+inherits = *common*; *slowabl*; *descendingz*
+retract_length = 3
+bed_shape = 5x5,295x5,295x220,5x220
+max_print_height = 380
+printer_model = CR5PROH
+printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR5PROH\nPRINTER_HAS_BOWDEN
+
+[printer:Creality CR-6 SE]
+inherits = *common*; *fastabl*; *pauseprint*
+bed_shape = 5x0,230x0,230x235,5x235
+printer_model = CR6SE
+printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR6SE\nPRINTER_HAS_BOWDEN
+
+[printer:Creality CR-6 Max]
+inherits = *common*; *slowabl*
+retract_length = 6
+bed_shape = 5x5,395x5,395x395,5x395
+max_print_height = 400
+printer_model = CR6MAX
+printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR6MAX\nPRINTER_HAS_BOWDEN
 
 [printer:Creality CR-10 Mini]
-inherits = Creality Ender-3
+inherits = *common*
 retract_length = 6
-bed_shape = 2.5x5,2.5x225,302.5x225,302.5x5
+bed_shape = 2.5x5,302.5x5,302.5x225,2.5x225
 max_print_height = 300
 printer_model = CR10MINI
 printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR10MINI\nPRINTER_HAS_BOWDEN
 
-#[printer:Creality CR-10 Max]
-#inherits = Creality Ender-3; *slowabl*
-#retract_length = 6
-#bed_shape = 5x5,445x5,445x445,5x445
-#max_print_height = 470
-#printer_model = CR10MAX
-#printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR10MAX\nPRINTER_HAS_BOWDEN
+[printer:Creality CR-10 Max]
+inherits = *common*; *slowabl*
+retract_length = 6
+bed_shape = 5x5,445x5,445x445,5x445
+max_print_height = 470
+printer_model = CR10MAX
+printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR10MAX\nPRINTER_HAS_BOWDEN
 
 [printer:Creality CR-10]
-inherits = Creality Ender-3
+inherits = *common*
 retract_length = 6
 bed_shape = 5x5,305x5,305x305,5x305
 max_print_height = 400
@@ -944,7 +964,7 @@ printer_model = CR10
 printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR10\nPRINTER_HAS_BOWDEN
 
 [printer:Creality CR-10 V2]
-inherits = Creality Ender-3
+inherits = *common*
 retract_length = 6
 bed_shape = 5x5,305x5,305x305,5x305
 max_print_height = 400
@@ -952,7 +972,7 @@ printer_model = CR10V2
 printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR10V2\nPRINTER_HAS_BOWDEN
 
 [printer:Creality CR-10 V3]
-inherits = Creality Ender-3
+inherits = *common*
 retract_length = 1
 bed_shape = 5x5,305x5,305x305,5x305
 max_print_height = 400
@@ -960,7 +980,7 @@ printer_model = CR10V3
 printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR10V3
 
 [printer:Creality CR-10 S]
-inherits = Creality Ender-3
+inherits = *common*
 retract_length = 6
 bed_shape = 5x5,305x5,305x305,5x305
 max_print_height = 400
@@ -968,7 +988,7 @@ printer_model = CR10S
 printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR10S\nPRINTER_HAS_BOWDEN
 
 [printer:Creality CR-10 S Pro]
-inherits = Creality Ender-3; *slowabl*
+inherits = *common*; *slowabl*
 retract_length = 6
 bed_shape = 5x5,295x5,295x295,5x295
 max_print_height = 400
@@ -976,7 +996,7 @@ printer_model = CR10SPRO
 printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR10SPRO\nPRINTER_HAS_BOWDEN
 
 [printer:Creality CR-10 S Pro V2]
-inherits = Creality Ender-3; *slowabl*
+inherits = *common*; *slowabl*
 retract_length = 6
 bed_shape = 5x5,305x5,305x305,5x305
 max_print_height = 400
@@ -984,7 +1004,7 @@ printer_model = CR10SPROV2
 printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR10SPROV2\nPRINTER_HAS_BOWDEN
 
 [printer:Creality CR-10 S4]
-inherits = Creality Ender-3
+inherits = *common*
 retract_length = 6
 bed_shape = 5x5,395x5,395x395,5x395
 max_print_height = 400
@@ -992,7 +1012,7 @@ printer_model = CR10S4
 printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR10S4\nPRINTER_HAS_BOWDEN
 
 [printer:Creality CR-10 S5]
-inherits = Creality Ender-3
+inherits = *common*
 retract_length = 6
 bed_shape = 5x5,505x5,505x505,5x505
 max_print_height = 500
@@ -1000,25 +1020,32 @@ printer_model = CR10S5
 printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR10S5\nPRINTER_HAS_BOWDEN
 
 [printer:Creality CR-20]
-inherits = Creality Ender-3
+inherits = *common*
 printer_model = CR20
 printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR20\nPRINTER_HAS_BOWDEN
 
 [printer:Creality CR-20 Pro]
-inherits = Creality Ender-3; *fastabl*
+inherits = *common*; *fastabl*
 retract_length = 4
 printer_model = CR20PRO
 printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR20PRO\nPRINTER_HAS_BOWDEN
 
-#[printer:Creality CR-8]
-#inherits = Creality Ender-3
-#bed_shape = 5x5,215x5,215x215,5x215
-#max_print_height = 210
-#printer_model = CR8
-#printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR8\nPRINTER_HAS_BOWDEN
+[printer:Creality CR-200B]
+inherits = *common*; *descendingz*
+bed_shape = 5x5,195x5,195x195,5x195
+max_print_height = 200
+printer_model = CR200B
+printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR200B\nPRINTER_HAS_BOWDEN
+
+[printer:Creality CR-8]
+inherits = *common*
+bed_shape = 5x5,215x5,215x215,5x215
+max_print_height = 210
+printer_model = CR8
+printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CR8\nPRINTER_HAS_BOWDEN
 
 #[printer:Creality CR-X]
-#inherits = Creality Ender-3; *dualextruder*
+#inherits = *common*; *dualextruder*
 #retract_length = 6,6
 #bed_shape = 5x5,295x5,295x295,5x295
 #max_print_height = 400
@@ -1026,7 +1053,7 @@ printer_notes = Don't remove the following keywords! These keywords are used in
 #printer_notes = Don't remove the following keywords! These keywords are used in the "compatible printer" condition of the print and filament profiles to link the particular print and filament profiles to this printer profile.\nPRINTER_VENDOR_CREALITY\nPRINTER_MODEL_CRX\nPRINTER_HAS_BOWDEN
 
 #[printer:Creality CR-X Pro]
-#inherits = Creality Ender-3; *dualextruder*; *slowabl*
+#inherits = *common*; *dualextruder*; *slowabl*
 #retract_length = 6,6
 #bed_shape = 5x5,295x5,295x295,5x295
 #max_print_height = 400
diff --git a/resources/profiles/Creality/CR200B_thumbnail.png b/resources/profiles/Creality/CR200B_thumbnail.png
new file mode 100644
index 000000000..d5b964ac9
Binary files /dev/null and b/resources/profiles/Creality/CR200B_thumbnail.png differ
diff --git a/resources/profiles/Creality/CR5PROH_thumbnail.png b/resources/profiles/Creality/CR5PROH_thumbnail.png
new file mode 100644
index 000000000..df2f1b665
Binary files /dev/null and b/resources/profiles/Creality/CR5PROH_thumbnail.png differ
diff --git a/resources/profiles/Creality/CR5PRO_thumbnail.png b/resources/profiles/Creality/CR5PRO_thumbnail.png
new file mode 100644
index 000000000..df2f1b665
Binary files /dev/null and b/resources/profiles/Creality/CR5PRO_thumbnail.png differ
diff --git a/resources/profiles/Creality/cr200b.svg b/resources/profiles/Creality/cr200b.svg
new file mode 100644
index 000000000..6012188d7
--- /dev/null
+++ b/resources/profiles/Creality/cr200b.svg
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="190mm" height="190mm" version="1.1" viewBox="0 0 190 190" xmlns="http://www.w3.org/2000/svg">
+  <rect x=".25" y=".25" width="189.5" height="189.5" fill="none" stroke="#fff" stroke-width=".5"/>
+</svg>
diff --git a/resources/profiles/Creality/cr200b_bed.stl b/resources/profiles/Creality/cr200b_bed.stl
new file mode 100644
index 000000000..210c329e7
--- /dev/null
+++ b/resources/profiles/Creality/cr200b_bed.stl
@@ -0,0 +1,2774 @@
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+      vertex -147.002 -112.498 0
+      vertex -147.002 -112.498 -3
+    endloop
+  endfacet
+  facet normal -0.707107 -0.707107 0
+    outer loop
+      vertex -147 -112.5 -3
+      vertex -147 -112.5 0
+      vertex -147.002 -112.498 0
+    endloop
+  endfacet
+  facet normal 0 -1 0
+    outer loop
+      vertex 147 -112.5 -3
+      vertex -147 -112.5 0
+      vertex -147 -112.5 -3
+    endloop
+  endfacet
+  facet normal 0 -1 0
+    outer loop
+      vertex 147 -112.5 -3
+      vertex 147 -112.5 0
+      vertex -147 -112.5 0
+    endloop
+  endfacet
+  facet normal 0.707107 -0.707107 0
+    outer loop
+      vertex 147.002 -112.498 -3
+      vertex 147 -112.5 0
+      vertex 147 -112.5 -3
+    endloop
+  endfacet
+  facet normal 0.707107 -0.707107 0
+    outer loop
+      vertex 147.002 -112.498 -3
+      vertex 147.002 -112.498 0
+      vertex 147 -112.5 0
+    endloop
+  endfacet
+endsolid OpenSCAD_Model
diff --git a/resources/profiles/INAT.ini b/resources/profiles/INAT.ini
index 0c4cbe5f4..e11aeab86 100644
--- a/resources/profiles/INAT.ini
+++ b/resources/profiles/INAT.ini
@@ -2,7 +2,7 @@
 
 [vendor]
 # Vendor name will be shown by the Config Wizard.
-name = INAT s.r.o.
+name = INAT
 config_version = 0.0.1
 config_update_url = http://files.prusa3d.com/wp-content/uploads/repository/PrusaSlicer-settings-master/live/INAT/
 
diff --git a/src/libslic3r/AppConfig.cpp b/src/libslic3r/AppConfig.cpp
index fd1ddf055..d9301d1f3 100644
--- a/src/libslic3r/AppConfig.cpp
+++ b/src/libslic3r/AppConfig.cpp
@@ -68,14 +68,12 @@ void AppConfig::set_defaults()
         if (get("export_sources_full_pathnames").empty())
             set("export_sources_full_pathnames", "0");
 
-#if ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 #ifdef _WIN32
         if (get("associate_3mf").empty())
             set("associate_3mf", "0");
         if (get("associate_stl").empty())
             set("associate_stl", "0");
 #endif // _WIN32
-#endif // ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 
         // remove old 'use_legacy_opengl' parameter from this config, if present
         if (!get("use_legacy_opengl").empty())
@@ -127,14 +125,12 @@ void AppConfig::set_defaults()
         if (get("color_mapinulation_panel").empty())
             set("color_mapinulation_panel", "0");
     }
-#if ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
     else {
 #ifdef _WIN32
         if (get("associate_gcode").empty())
             set("associate_gcode", "0");
 #endif // _WIN32
     }
-#endif // ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 
     if (get("seq_top_layer_only").empty())
         set("seq_top_layer_only", "1");
@@ -156,12 +152,10 @@ void AppConfig::set_defaults()
     if (get("show_splash_screen").empty())
         set("show_splash_screen", "1");
 
-#if ENABLE_CTRL_M_ON_WINDOWS
 #ifdef _WIN32
     if (get("use_legacy_3DConnexion").empty())
         set("use_legacy_3DConnexion", "0");
 #endif // _WIN32
-#endif // ENABLE_CTRL_M_ON_WINDOWS
 
     // Remove legacy window positions/sizes
     erase("", "main_frame_maximized");
diff --git a/src/libslic3r/CMakeLists.txt b/src/libslic3r/CMakeLists.txt
index 1267e216c..6159b2c5c 100644
--- a/src/libslic3r/CMakeLists.txt
+++ b/src/libslic3r/CMakeLists.txt
@@ -145,6 +145,8 @@ add_library(libslic3r STATIC
     Point.hpp
     Polygon.cpp
     Polygon.hpp
+    MutablePolygon.cpp
+    MutablePolygon.hpp
     PolygonTrimmer.cpp
     PolygonTrimmer.hpp
     Polyline.cpp
diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index 27e5b478b..728019c1d 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -667,6 +667,14 @@ namespace DoExport {
                     break;
             }
         }
+        if (ret.size() < MAX_TAGS_COUNT) {
+            const CustomGCode::Info& custom_gcode_per_print_z = print.model().custom_gcode_per_print_z;
+            for (const auto& gcode : custom_gcode_per_print_z.gcodes) {
+                check(_(L("Custom G-code")), gcode.extra);
+                if (ret.size() == MAX_TAGS_COUNT)
+                    break;
+            }
+        }
 
         return ret;
     }
@@ -1705,7 +1713,9 @@ namespace ProcessLayer
 {
 
     static std::string emit_custom_gcode_per_print_z(
+        GCode                                                   &gcodegen,
         const CustomGCode::Item 								*custom_gcode,
+        unsigned int                                             current_extruder_id,
         // ID of the first extruder printing this layer.
         unsigned int                                             first_extruder_id,
         const PrintConfig                                       &config)
@@ -1746,12 +1756,14 @@ namespace ProcessLayer
                     // && !MMU1
                     ) {
                     //! FIXME_in_fw show message during print pause
-                    gcode += config.pause_print_gcode;// pause print
+                    DynamicConfig cfg;
+                    cfg.set_key_value("color_change_extruder", new ConfigOptionInt(m600_extruder_before_layer));
+                    gcode += gcodegen.placeholder_parser_process("pause_print_gcode", config.pause_print_gcode, current_extruder_id, &cfg);
                     gcode += "\n";
                     gcode += "M117 Change filament for Extruder " + std::to_string(m600_extruder_before_layer) + "\n";
                 }
                 else {
-                    gcode += config.color_change_gcode;//ColorChangeCode;
+                    gcode += gcodegen.placeholder_parser_process("color_change_gcode", config.color_change_gcode, current_extruder_id);
                     gcode += "\n";
                 }
 	        } 
@@ -1767,7 +1779,7 @@ namespace ProcessLayer
                     //! FIXME_in_fw show message during print pause
 	                if (!pause_print_msg.empty())
 	                    gcode += "M117 " + pause_print_msg + "\n";
-                    gcode += config.pause_print_gcode;
+                    gcode += gcodegen.placeholder_parser_process("pause_print_gcode", config.pause_print_gcode, current_extruder_id);
                 }
 	            else {
                     // add tag for processor
@@ -1776,8 +1788,8 @@ namespace ProcessLayer
 #else
                     gcode += ";" + GCodeProcessor::Custom_Code_Tag + "\n";
 #endif // ENABLE_VALIDATE_CUSTOM_GCODE
-                    if (gcode_type == CustomGCode::Template)    // Template Cistom Gcode
-                        gcode += config.template_custom_gcode;
+                    if (gcode_type == CustomGCode::Template)    // Template Custom Gcode
+                        gcode += gcodegen.placeholder_parser_process("template_custom_gcode", config.template_custom_gcode, current_extruder_id);
                     else                                        // custom Gcode
                         gcode += custom_gcode->extra;
 
@@ -1803,7 +1815,6 @@ namespace Skirt {
 
     static std::map<unsigned int, std::pair<size_t, size_t>> make_skirt_loops_per_extruder_1st_layer(
         const Print             				&print,
-        const std::vector<GCode::LayerToPrint> 	& /*layers */,
         const LayerTools                		&layer_tools,
         // Heights (print_z) at which the skirt has already been extruded.
         std::vector<coordf_t>  			    	&skirt_done)
@@ -1811,7 +1822,8 @@ namespace Skirt {
         // Extrude skirt at the print_z of the raft layers and normal object layers
         // not at the print_z of the interlaced support material layers.
         std::map<unsigned int, std::pair<size_t, size_t>> skirt_loops_per_extruder_out;
-        if (skirt_done.empty() && print.has_skirt() && ! print.skirt().entities.empty()) {
+        assert(skirt_done.empty());
+        if (skirt_done.empty() && print.has_skirt() && ! print.skirt().entities.empty() && layer_tools.has_skirt) {
             skirt_loops_per_extruder_all_printing(print, layer_tools, skirt_loops_per_extruder_out);
             skirt_done.emplace_back(layer_tools.print_z);
         }
@@ -1820,36 +1832,34 @@ namespace Skirt {
 
     static std::map<unsigned int, std::pair<size_t, size_t>> make_skirt_loops_per_extruder_other_layers(
         const Print 							&print,
-        const std::vector<GCode::LayerToPrint> 	&layers,
         const LayerTools                		&layer_tools,
-        // First non-empty support layer.
-        const SupportLayer  					*support_layer,
         // Heights (print_z) at which the skirt has already been extruded.
         std::vector<coordf_t>			    	&skirt_done)
     {
         // Extrude skirt at the print_z of the raft layers and normal object layers
         // not at the print_z of the interlaced support material layers.
         std::map<unsigned int, std::pair<size_t, size_t>> skirt_loops_per_extruder_out;
-        if (print.has_skirt() && ! print.skirt().entities.empty() &&
+        if (print.has_skirt() && ! print.skirt().entities.empty() && layer_tools.has_skirt &&
             // Not enough skirt layers printed yet.
             //FIXME infinite or high skirt does not make sense for sequential print!
-            (skirt_done.size() < (size_t)print.config().skirt_height.value || print.has_infinite_skirt()) &&
+            (skirt_done.size() < (size_t)print.config().skirt_height.value || print.has_infinite_skirt())) {
+            bool valid = ! skirt_done.empty() && skirt_done.back() < layer_tools.print_z - EPSILON;
+            assert(valid);
             // This print_z has not been extruded yet (sequential print)
             // FIXME: The skirt_done should not be empty at this point. The check is a workaround
             // of https://github.com/prusa3d/PrusaSlicer/issues/5652, but it deserves a real fix.
-            (! skirt_done.empty() && skirt_done.back() < layer_tools.print_z - EPSILON) &&
-            // and this layer is an object layer, or it is a raft layer.
-            (layer_tools.has_object || support_layer->id() < (size_t)support_layer->object()->config().raft_layers.value)) {
+            if (valid) {
 #if 0
-            // Prime just the first printing extruder. This is original Slic3r's implementation.
-            skirt_loops_per_extruder_out[layer_tools.extruders.front()] = std::pair<size_t, size_t>(0, print.config().skirts.value);
+                // Prime just the first printing extruder. This is original Slic3r's implementation.
+                skirt_loops_per_extruder_out[layer_tools.extruders.front()] = std::pair<size_t, size_t>(0, print.config().skirts.value);
 #else
-            // Prime all extruders planned for this layer, see
-            // https://github.com/prusa3d/PrusaSlicer/issues/469#issuecomment-322450619
-            skirt_loops_per_extruder_all_printing(print, layer_tools, skirt_loops_per_extruder_out);
+                // Prime all extruders planned for this layer, see
+                // https://github.com/prusa3d/PrusaSlicer/issues/469#issuecomment-322450619
+                skirt_loops_per_extruder_all_printing(print, layer_tools, skirt_loops_per_extruder_out);
 #endif
-            assert(!skirt_done.empty());
-            skirt_done.emplace_back(layer_tools.print_z);
+                assert(!skirt_done.empty());
+                skirt_done.emplace_back(layer_tools.print_z);
+            }
         }
         return skirt_loops_per_extruder_out;
     }
@@ -1987,13 +1997,13 @@ void GCode::process_layer(
 
     if (single_object_instance_idx == size_t(-1)) {
         // Normal (non-sequential) print.
-        gcode += ProcessLayer::emit_custom_gcode_per_print_z(layer_tools.custom_gcode, first_extruder_id, print.config());
+        gcode += ProcessLayer::emit_custom_gcode_per_print_z(*this, layer_tools.custom_gcode, m_writer.extruder()->id(), first_extruder_id, print.config());
     }
     // Extrude skirt at the print_z of the raft layers and normal object layers
     // not at the print_z of the interlaced support material layers.
     skirt_loops_per_extruder = first_layer ?
-        Skirt::make_skirt_loops_per_extruder_1st_layer(print, layers, layer_tools, m_skirt_done) :
-        Skirt::make_skirt_loops_per_extruder_other_layers(print, layers, layer_tools, support_layer, m_skirt_done);
+        Skirt::make_skirt_loops_per_extruder_1st_layer(print, layer_tools, m_skirt_done) :
+        Skirt::make_skirt_loops_per_extruder_other_layers(print, layer_tools, m_skirt_done);
 
     // Group extrusions by an extruder, then by an object, an island and a region.
     std::map<unsigned int, std::vector<ObjectByExtruder>> by_extruder;
@@ -2840,9 +2850,11 @@ std::string GCode::travel_to(const Point &point, ExtrusionRole role, std::string
     Polyline travel { this->last_pos(), point };
 
     // check whether a straight travel move would need retraction
-    bool needs_retraction       = this->needs_retraction(travel, role);
+    bool needs_retraction             = this->needs_retraction(travel, role);
     // check whether wipe could be disabled without causing visible stringing
-    bool could_be_wipe_disabled = false;
+    bool could_be_wipe_disabled       = false;
+    // Save state of use_external_mp_once for the case that will be needed to call twice m_avoid_crossing_perimeters.travel_to.
+    const bool used_external_mp_once  = m_avoid_crossing_perimeters.used_external_mp_once();
 
     // if a retraction would be needed, try to use avoid_crossing_perimeters to plan a
     // multi-hop travel path inside the configuration space
@@ -2870,8 +2882,13 @@ std::string GCode::travel_to(const Point &point, ExtrusionRole role, std::string
         // Because of it, it is necessary to call avoid crossing perimeters again with new starting point after calling retraction()
         // FIXME Lukas H.: Try to predict if this second calling of avoid crossing perimeters will be needed or not. It could save computations.
         if (last_post_before_retract != this->last_pos() && m_config.avoid_crossing_perimeters) {
-            Polyline retract_travel = m_avoid_crossing_perimeters.travel_to(*this, point);
-            travel = std::move(retract_travel);
+            // If in the previous call of m_avoid_crossing_perimeters.travel_to was use_external_mp_once set to true restore this value for next call.
+            if (used_external_mp_once)
+                m_avoid_crossing_perimeters.use_external_mp_once();
+            travel = m_avoid_crossing_perimeters.travel_to(*this, point);
+            // If state of use_external_mp_once was changed reset it to right value.
+            if (used_external_mp_once)
+                m_avoid_crossing_perimeters.reset_once_modifiers();
         }
     } else
         // Reset the wipe path when traveling, so one would not wipe along an old path.
diff --git a/src/libslic3r/GCode/AvoidCrossingPerimeters.hpp b/src/libslic3r/GCode/AvoidCrossingPerimeters.hpp
index 03c420a32..d178e3c89 100644
--- a/src/libslic3r/GCode/AvoidCrossingPerimeters.hpp
+++ b/src/libslic3r/GCode/AvoidCrossingPerimeters.hpp
@@ -18,6 +18,7 @@ public:
     // Routing around the objects vs. inside a single object.
     void        use_external_mp(bool use = true) { m_use_external_mp = use; };
     void        use_external_mp_once()  { m_use_external_mp_once = true; }
+    bool        used_external_mp_once() { return m_use_external_mp_once; }
     void        disable_once()          { m_disabled_once = true; }
     bool        disabled_once() const   { return m_disabled_once; }
     void        reset_once_modifiers()  { m_use_external_mp_once = false; m_disabled_once = false; }
diff --git a/src/libslic3r/GCode/GCodeProcessor.cpp b/src/libslic3r/GCode/GCodeProcessor.cpp
index eb5c616a1..3b9cecfea 100644
--- a/src/libslic3r/GCode/GCodeProcessor.cpp
+++ b/src/libslic3r/GCode/GCodeProcessor.cpp
@@ -4,6 +4,9 @@
 #include "GCodeProcessor.hpp"
 
 #include <boost/log/trivial.hpp>
+#if ENABLE_VALIDATE_CUSTOM_GCODE
+#include <boost/algorithm/string/predicate.hpp>
+#endif // ENABLE_VALIDATE_CUSTOM_GCODE
 #include <boost/nowide/fstream.hpp>
 #include <boost/nowide/cstdio.hpp>
 #if ENABLE_GCODE_WINDOW
@@ -597,12 +600,6 @@ const std::vector<std::pair<GCodeProcessor::EProducer, std::string>> GCodeProces
 unsigned int GCodeProcessor::s_result_id = 0;
 
 #if ENABLE_VALIDATE_CUSTOM_GCODE
-static inline bool starts_with(const std::string_view comment, const std::string_view tag)
-{
-    size_t tag_len = tag.size();
-    return comment.size() >= tag_len && comment.substr(0, tag_len) == tag;
-}
-
 bool GCodeProcessor::contains_reserved_tag(const std::string& gcode, std::string& found_tag)
 {
     bool ret = false;
@@ -613,7 +610,7 @@ bool GCodeProcessor::contains_reserved_tag(const std::string& gcode, std::string
         if (comment.length() > 2 && comment.front() == ';') {
             comment = comment.substr(1);
             for (const std::string& s : Reserved_Tags) {
-                if (starts_with(comment, s)) {
+                if (boost::starts_with(comment, s)) {
                     ret = true;
                     found_tag = comment;
                     parser.quit_parsing();
@@ -638,7 +635,7 @@ bool GCodeProcessor::contains_reserved_tags(const std::string& gcode, unsigned i
         if (comment.length() > 2 && comment.front() == ';') {
             comment = comment.substr(1);
             for (const std::string& s : Reserved_Tags) {
-                if (starts_with(comment, s)) {
+                if (boost::starts_with(comment, s)) {
                     ret = true;
                     found_tag.push_back(comment);
                     if (found_tag.size() == max_count) {
@@ -681,6 +678,8 @@ void GCodeProcessor::apply_config(const PrintConfig& config)
         m_extruder_colors[i] = static_cast<unsigned char>(i);
     }
 
+    m_extruder_temps.resize(extruders_count);
+
     m_filament_diameters.resize(config.filament_diameter.values.size());
     for (size_t i = 0; i < config.filament_diameter.values.size(); ++i) {
         m_filament_diameters[i] = static_cast<float>(config.filament_diameter.values[i]);
@@ -708,10 +707,7 @@ void GCodeProcessor::apply_config(const PrintConfig& config)
     }
 
     m_time_processor.export_remaining_time_enabled = config.remaining_times.value;
-
-#if ENABLE_VOLUMETRIC_EXTRUSION_PROCESSING
     m_use_volumetric_e = config.use_volumetric_e;
-#endif // ENABLE_VOLUMETRIC_EXTRUSION_PROCESSING
 }
 
 void GCodeProcessor::apply_config(const DynamicPrintConfig& config)
@@ -782,6 +778,8 @@ void GCodeProcessor::apply_config(const DynamicPrintConfig& config)
         m_extruder_colors[i] = static_cast<unsigned char>(i);
     }
 
+    m_extruder_temps.resize(m_result.extruders_count);
+
     const ConfigOptionFloats* filament_load_time = config.option<ConfigOptionFloats>("filament_load_time");
     if (filament_load_time != nullptr) {
         m_time_processor.filament_load_times.resize(filament_load_time->values.size());
@@ -873,11 +871,9 @@ void GCodeProcessor::apply_config(const DynamicPrintConfig& config)
     if (m_time_processor.machine_limits.machine_max_acceleration_x.values.size() > 1)
         enable_stealth_time_estimator(true);
 
-#if ENABLE_VOLUMETRIC_EXTRUSION_PROCESSING
     const ConfigOptionBool* use_volumetric_e = config.option<ConfigOptionBool>("use_volumetric_e");
     if (use_volumetric_e != nullptr)
         m_use_volumetric_e = use_volumetric_e->value;
-#endif // ENABLE_VOLUMETRIC_EXTRUSION_PROCESSING
 }
 
 void GCodeProcessor::enable_stealth_time_estimator(bool enabled)
@@ -918,6 +914,10 @@ void GCodeProcessor::reset()
     for (size_t i = 0; i < Min_Extruder_Count; ++i) {
         m_extruder_colors[i] = static_cast<unsigned char>(i);
     }
+    m_extruder_temps.resize(Min_Extruder_Count);
+    for (size_t i = 0; i < Min_Extruder_Count; ++i) {
+        m_extruder_temps[i] = 0.0f;
+    }
 
     m_filament_diameters = std::vector<float>(Min_Extruder_Count, 1.75f);
     m_extruded_last_z = 0.0f;
@@ -933,9 +933,7 @@ void GCodeProcessor::reset()
     m_result.reset();
     m_result.id = ++s_result_id;
 
-#if ENABLE_VOLUMETRIC_EXTRUSION_PROCESSING
     m_use_volumetric_e = false;
-#endif // ENABLE_VOLUMETRIC_EXTRUSION_PROCESSING
 
 #if ENABLE_GCODE_VIEWER_DATA_CHECKING
     m_mm3_per_mm_compare.reset();
@@ -1136,9 +1134,11 @@ void GCodeProcessor::process_gcode_line(const GCodeReader::GCodeLine& line)
                 case 1:   { process_M1(line); break; }   // Sleep or Conditional stop
                 case 82:  { process_M82(line); break; }  // Set extruder to absolute mode
                 case 83:  { process_M83(line); break; }  // Set extruder to relative mode
+                case 104: { process_M104(line); break; } // Set extruder temperature
                 case 106: { process_M106(line); break; } // Set fan speed
                 case 107: { process_M107(line); break; } // Disable fan
                 case 108: { process_M108(line); break; } // Set tool (Sailfish)
+                case 109: { process_M109(line); break; } // Set extruder temperature and wait
                 case 132: { process_M132(line); break; } // Recall stored home offsets
                 case 135: { process_M135(line); break; } // Set tool (MakerWare)
                 case 201: { process_M201(line); break; } // Set max printing acceleration
@@ -1171,14 +1171,6 @@ void GCodeProcessor::process_gcode_line(const GCodeReader::GCodeLine& line)
     }
 }
 
-#if !ENABLE_VALIDATE_CUSTOM_GCODE
-static inline bool starts_with(const std::string_view comment, const std::string_view tag)
-{
-    size_t tag_len = tag.size();
-    return comment.size() >= tag_len && comment.substr(0, tag_len) == tag;
-}
-#endif // !ENABLE_VALIDATE_CUSTOM_GCODE
-
 #if __has_include(<charconv>)
     template <typename T, typename = void>
     struct is_from_chars_convertible : std::false_type {};
@@ -1232,37 +1224,37 @@ void GCodeProcessor::process_tags(const std::string_view comment)
 
 #if ENABLE_VALIDATE_CUSTOM_GCODE
     // extrusion role tag
-    if (starts_with(comment, reserved_tag(ETags::Role))) {
+    if (boost::starts_with(comment, reserved_tag(ETags::Role))) {
         m_extrusion_role = ExtrusionEntity::string_to_role(comment.substr(reserved_tag(ETags::Role).length()));
         return;
     }
 
     // wipe start tag
-    if (starts_with(comment, reserved_tag(ETags::Wipe_Start))) {
+    if (boost::starts_with(comment, reserved_tag(ETags::Wipe_Start))) {
         m_wiping = true;
         return;
     }
 
     // wipe end tag
-    if (starts_with(comment, reserved_tag(ETags::Wipe_End))) {
+    if (boost::starts_with(comment, reserved_tag(ETags::Wipe_End))) {
         m_wiping = false;
         return;
     }
 #else
     // extrusion role tag
-    if (starts_with(comment, Extrusion_Role_Tag)) {
+    if (boost::starts_with(comment, Extrusion_Role_Tag)) {
         m_extrusion_role = ExtrusionEntity::string_to_role(comment.substr(Extrusion_Role_Tag.length()));
         return;
     }
 
     // wipe start tag
-    if (starts_with(comment, Wipe_Start_Tag)) {
+    if (boost::starts_with(comment, Wipe_Start_Tag)) {
         m_wiping = true;
         return;
     }
 
     // wipe end tag
-    if (starts_with(comment, Wipe_End_Tag)) {
+    if (boost::starts_with(comment, Wipe_End_Tag)) {
         m_wiping = false;
         return;
     }
@@ -1271,26 +1263,26 @@ void GCodeProcessor::process_tags(const std::string_view comment)
     if (!m_producers_enabled || m_producer == EProducer::PrusaSlicer) {
 #if ENABLE_VALIDATE_CUSTOM_GCODE
         // height tag
-        if (starts_with(comment, reserved_tag(ETags::Height))) {
+        if (boost::starts_with(comment, reserved_tag(ETags::Height))) {
             if (!parse_number(comment.substr(reserved_tag(ETags::Height).size()), m_forced_height))
                 BOOST_LOG_TRIVIAL(error) << "GCodeProcessor encountered an invalid value for Height (" << comment << ").";
             return;
         }
         // width tag
-        if (starts_with(comment, reserved_tag(ETags::Width))) {
+        if (boost::starts_with(comment, reserved_tag(ETags::Width))) {
             if (!parse_number(comment.substr(reserved_tag(ETags::Width).size()), m_forced_width))
                 BOOST_LOG_TRIVIAL(error) << "GCodeProcessor encountered an invalid value for Width (" << comment << ").";
             return;
         }
 #else
         // height tag
-        if (starts_with(comment, Height_Tag)) {
+        if (boost::starts_with(comment, Height_Tag)) {
             if (!parse_number(comment.substr(Height_Tag.size()), m_forced_height))
                 BOOST_LOG_TRIVIAL(error) << "GCodeProcessor encountered an invalid value for Height (" << comment << ").";
             return;
         }
         // width tag
-        if (starts_with(comment, Width_Tag)) {
+        if (boost::starts_with(comment, Width_Tag)) {
             if (!parse_number(comment.substr(Width_Tag.size()), m_forced_width))
                 BOOST_LOG_TRIVIAL(error) << "GCodeProcessor encountered an invalid value for Width (" << comment << ").";
             return;
@@ -1300,9 +1292,9 @@ void GCodeProcessor::process_tags(const std::string_view comment)
 
 #if ENABLE_VALIDATE_CUSTOM_GCODE
     // color change tag
-    if (starts_with(comment, reserved_tag(ETags::Color_Change))) {
+    if (boost::starts_with(comment, reserved_tag(ETags::Color_Change))) {
         unsigned char extruder_id = 0;
-        if (starts_with(comment.substr(reserved_tag(ETags::Color_Change).size()), ",T")) {
+        if (boost::starts_with(comment.substr(reserved_tag(ETags::Color_Change).size()), ",T")) {
             int eid;
             if (!parse_number(comment.substr(reserved_tag(ETags::Color_Change).size() + 2), eid) || eid < 0 || eid > 255) {
                 BOOST_LOG_TRIVIAL(error) << "GCodeProcessor encountered an invalid value for Color_Change (" << comment << ").";
@@ -1346,9 +1338,9 @@ void GCodeProcessor::process_tags(const std::string_view comment)
     }
 #else
     // color change tag
-    if (starts_with(comment, Color_Change_Tag)) {
+    if (boost::starts_with(comment, Color_Change_Tag)) {
         unsigned char extruder_id = 0;
-        if (starts_with(comment.substr(Color_Change_Tag.size()), ",T")) {
+        if (boost::starts_with(comment.substr(Color_Change_Tag.size()), ",T")) {
             int eid;
             if (! parse_number(comment.substr(Color_Change_Tag.size() + 2), eid) || eid < 0 || eid > 255) {
                 BOOST_LOG_TRIVIAL(error) << "GCodeProcessor encountered an invalid value for Color_Change (" << comment << ").";
@@ -1394,7 +1386,7 @@ void GCodeProcessor::process_tags(const std::string_view comment)
 
 #if ENABLE_GCODE_VIEWER_DATA_CHECKING
     // mm3_per_mm print tag
-    if (starts_with(comment, Mm3_Per_Mm_Tag)) {
+    if (boost::starts_with(comment, Mm3_Per_Mm_Tag)) {
         if (! parse_number(comment.substr(Mm3_Per_Mm_Tag.size()), m_mm3_per_mm_compare.last_tag_value))
             BOOST_LOG_TRIVIAL(error) << "GCodeProcessor encountered an invalid value for Mm3_Per_Mm (" << comment << ").";
         return;
@@ -1846,14 +1838,10 @@ void GCodeProcessor::process_G0(const GCodeReader::GCodeLine& line)
 
 void GCodeProcessor::process_G1(const GCodeReader::GCodeLine& line)
 {
-#if ENABLE_VOLUMETRIC_EXTRUSION_PROCESSING
     float filament_diameter = (static_cast<size_t>(m_extruder_id) < m_filament_diameters.size()) ? m_filament_diameters[m_extruder_id] : m_filament_diameters.back();
     float filament_radius = 0.5f * filament_diameter;
     float area_filament_cross_section = static_cast<float>(M_PI) * sqr(filament_radius);
     auto absolute_position = [this, area_filament_cross_section](Axis axis, const GCodeReader::GCodeLine& lineG1) {
-#else
-    auto absolute_position = [this](Axis axis, const GCodeReader::GCodeLine& lineG1) {
-#endif // ENABLE_VOLUMETRIC_EXTRUSION_PROCESSING
         bool is_relative = (m_global_positioning_type == EPositioningType::Relative);
         if (axis == E)
             is_relative |= (m_e_local_positioning_type == EPositioningType::Relative);
@@ -1861,10 +1849,8 @@ void GCodeProcessor::process_G1(const GCodeReader::GCodeLine& line)
         if (lineG1.has(Slic3r::Axis(axis))) {
             float lengthsScaleFactor = (m_units == EUnits::Inches) ? INCHES_TO_MM : 1.0f;
             float ret = lineG1.value(Slic3r::Axis(axis)) * lengthsScaleFactor;
-#if ENABLE_VOLUMETRIC_EXTRUSION_PROCESSING
             if (axis == E && m_use_volumetric_e)
                 ret /= area_filament_cross_section;
-#endif // ENABLE_VOLUMETRIC_EXTRUSION_PROCESSING
             return is_relative ? m_start_position[axis] + ret : m_origin[axis] + ret;
         }
         else
@@ -1922,11 +1908,6 @@ void GCodeProcessor::process_G1(const GCodeReader::GCodeLine& line)
 
     if (type == EMoveType::Extrude) {
         float delta_xyz = std::sqrt(sqr(delta_pos[X]) + sqr(delta_pos[Y]) + sqr(delta_pos[Z]));
-#if !ENABLE_VOLUMETRIC_EXTRUSION_PROCESSING
-        float filament_diameter = (static_cast<size_t>(m_extruder_id) < m_filament_diameters.size()) ? m_filament_diameters[m_extruder_id] : m_filament_diameters.back();
-        float filament_radius = 0.5f * filament_diameter;
-        float area_filament_cross_section = static_cast<float>(M_PI) * sqr(filament_radius);
-#endif // !ENABLE_VOLUMETRIC_EXTRUSION_PROCESSING
         float volume_extruded_filament = area_filament_cross_section * delta_pos[E];
         float area_toolpath_cross_section = volume_extruded_filament / delta_xyz;
 
@@ -2235,6 +2216,13 @@ void GCodeProcessor::process_M83(const GCodeReader::GCodeLine& line)
     m_e_local_positioning_type = EPositioningType::Relative;
 }
 
+void GCodeProcessor::process_M104(const GCodeReader::GCodeLine& line)
+{
+    float new_temp;
+    if (line.has_value('S', new_temp))
+        m_extruder_temps[m_extruder_id] = new_temp;
+}
+
 void GCodeProcessor::process_M106(const GCodeReader::GCodeLine& line)
 {
     if (!line.has('P')) {
@@ -2267,6 +2255,21 @@ void GCodeProcessor::process_M108(const GCodeReader::GCodeLine& line)
         process_T(cmd.substr(pos));
 }
 
+void GCodeProcessor::process_M109(const GCodeReader::GCodeLine& line)
+{
+    float new_temp;
+    if (line.has_value('R', new_temp)) {
+        float val;
+        if (line.has_value('T', val)) {
+            size_t eid = static_cast<size_t>(val);
+            if (eid < m_extruder_temps.size())
+                m_extruder_temps[eid] = new_temp;
+        }
+        else
+            m_extruder_temps[m_extruder_id] = new_temp;
+    }
+}
+
 void GCodeProcessor::process_M132(const GCodeReader::GCodeLine& line)
 {
     // This command is used by Makerbot to load the current home position from EEPROM
@@ -2555,6 +2558,7 @@ void GCodeProcessor::store_move_vertex(EMoveType type)
         m_height,
         m_mm3_per_mm,
         m_fan_speed,
+        m_extruder_temps[m_extruder_id],
         static_cast<float>(m_result.moves.size())
     };
     m_result.moves.emplace_back(vertex);
diff --git a/src/libslic3r/GCode/GCodeProcessor.hpp b/src/libslic3r/GCode/GCodeProcessor.hpp
index 04d4c9eee..5b237530e 100644
--- a/src/libslic3r/GCode/GCodeProcessor.hpp
+++ b/src/libslic3r/GCode/GCodeProcessor.hpp
@@ -121,6 +121,7 @@ namespace Slic3r {
     private:
         using AxisCoords = std::array<float, 4>;
         using ExtruderColors = std::vector<unsigned char>;
+        using ExtruderTemps = std::vector<float>;
 
         enum class EUnits : unsigned char
         {
@@ -211,6 +212,7 @@ namespace Slic3r {
             float height{ 0.0f }; // mm
             float mm3_per_mm{ 0.0f };
             float fan_speed{ 0.0f }; // percentage
+            float temperature{ 0.0f }; // Celsius degrees
             float time{ 0.0f }; // s
 
             float volumetric_rate() const { return feedrate * mm3_per_mm; }
@@ -320,6 +322,7 @@ namespace Slic3r {
             float height{ 0.0f }; // mm
             float mm3_per_mm{ 0.0f };
             float fan_speed{ 0.0f }; // percentage
+            float temperature{ 0.0f }; // Celsius degrees
             float time{ 0.0f }; // s
 
             float volumetric_rate() const { return feedrate * mm3_per_mm; }
@@ -470,14 +473,13 @@ namespace Slic3r {
         ExtrusionRole m_extrusion_role;
         unsigned char m_extruder_id;
         ExtruderColors m_extruder_colors;
+        ExtruderTemps m_extruder_temps;
         std::vector<float> m_filament_diameters;
         float m_extruded_last_z;
         unsigned int m_g1_line_id;
         unsigned int m_layer_id;
         CpColor m_cp_color;
-#if ENABLE_VOLUMETRIC_EXTRUSION_PROCESSING
         bool m_use_volumetric_e;
-#endif // ENABLE_VOLUMETRIC_EXTRUSION_PROCESSING
 
         enum class EProducer
         {
@@ -590,6 +592,9 @@ namespace Slic3r {
         // Set extruder to relative mode
         void process_M83(const GCodeReader::GCodeLine& line);
 
+        // Set extruder temperature
+        void process_M104(const GCodeReader::GCodeLine& line);
+
         // Set fan speed
         void process_M106(const GCodeReader::GCodeLine& line);
 
@@ -599,6 +604,9 @@ namespace Slic3r {
         // Set tool (Sailfish)
         void process_M108(const GCodeReader::GCodeLine& line);
 
+        // Set extruder temperature and wait
+        void process_M109(const GCodeReader::GCodeLine& line);
+
         // Recall stored home offsets
         void process_M132(const GCodeReader::GCodeLine& line);
 
diff --git a/src/libslic3r/GCode/ToolOrdering.cpp b/src/libslic3r/GCode/ToolOrdering.cpp
index fae4028de..8520cf35b 100644
--- a/src/libslic3r/GCode/ToolOrdering.cpp
+++ b/src/libslic3r/GCode/ToolOrdering.cpp
@@ -70,6 +70,20 @@ unsigned int LayerTools::extruder(const ExtrusionEntityCollection &extrusions, c
 	return (extruder == 0) ? 0 : extruder - 1;
 }
 
+static double calc_max_layer_height(const PrintConfig &config, double max_object_layer_height)
+{
+    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];
+        if (mlh == 0.)
+            mlh = 0.75 * config.nozzle_diameter.values[i];
+        max_layer_height = std::min(max_layer_height, mlh);
+    }
+    // The Prusa3D Fast (0.35mm layer height) print profile sets a higher layer height than what is normally allowed
+    // by the nozzle. This is a hack and it works by increasing extrusion width. See GH #3919.
+    return std::max(max_layer_height, max_object_layer_height);
+}
+
 // For the use case when each object is printed separately
 // (print.config().complete_objects is true).
 ToolOrdering::ToolOrdering(const PrintObject &object, unsigned int first_extruder, bool prime_multi_material)
@@ -87,6 +101,7 @@ ToolOrdering::ToolOrdering(const PrintObject &object, unsigned int first_extrude
             zs.emplace_back(layer->print_z);
         this->initialize_layers(zs);
     }
+    double max_layer_height = calc_max_layer_height(object.print()->config(), object.config().layer_height);
 
     // Collect extruders reuqired to print the layers.
     this->collect_extruders(object, std::vector<std::pair<double, unsigned int>>());
@@ -94,9 +109,11 @@ ToolOrdering::ToolOrdering(const PrintObject &object, unsigned int first_extrude
     // Reorder the extruders to minimize tool switches.
     this->reorder_extruders(first_extruder);
 
-    this->fill_wipe_tower_partitions(object.print()->config(), object.layers().front()->print_z - object.layers().front()->height, object.config().layer_height);
+    this->fill_wipe_tower_partitions(object.print()->config(), object.layers().front()->print_z - object.layers().front()->height, max_layer_height);
 
     this->collect_extruder_statistics(prime_multi_material);
+
+    this->mark_skirt_layers(object.print()->config(), max_layer_height);
 }
 
 // For the use case when all objects are printed at once.
@@ -128,6 +145,7 @@ ToolOrdering::ToolOrdering(const Print &print, unsigned int first_extruder, bool
         }
         this->initialize_layers(zs);
     }
+    max_layer_height = calc_max_layer_height(print.config(), max_layer_height);
 
 	// Use the extruder switches from Model::custom_gcode_per_print_z to override the extruder to print the object.
 	// Do it only if all the objects were configured to be printed with a single extruder.
@@ -150,6 +168,8 @@ ToolOrdering::ToolOrdering(const Print &print, unsigned int first_extruder, bool
     this->fill_wipe_tower_partitions(print.config(), object_bottom_z, max_layer_height);
 
     this->collect_extruder_statistics(prime_multi_material);
+
+    this->mark_skirt_layers(print.config(), max_layer_height);
 }
 
 void ToolOrdering::initialize_layers(std::vector<coordf_t> &zs)
@@ -321,7 +341,7 @@ void ToolOrdering::reorder_extruders(unsigned int last_extruder_id)
         }    
 }
 
-void ToolOrdering::fill_wipe_tower_partitions(const PrintConfig &config, coordf_t object_bottom_z, coordf_t max_object_layer_height)
+void ToolOrdering::fill_wipe_tower_partitions(const PrintConfig &config, coordf_t object_bottom_z, coordf_t max_layer_height)
 {
     if (m_layer_tools.empty())
         return;
@@ -347,17 +367,6 @@ void ToolOrdering::fill_wipe_tower_partitions(const PrintConfig &config, coordf_
         lt.has_wipe_tower = (lt.has_object && lt.wipe_tower_partitions > 0) || lt.print_z < object_bottom_z + EPSILON;
 
     // Test for a raft, insert additional wipe tower layer to fill in the raft separation gap.
-    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];
-        if (mlh == 0.)
-            mlh = 0.75 * config.nozzle_diameter.values[i];
-        max_layer_height = std::min(max_layer_height, mlh);
-    }
-    // The Prusa3D Fast (0.35mm layer height) print profile sets a higher layer height than what is normally allowed
-    // by the nozzle. This is a hack and it works by increasing extrusion width. See GH #3919.
-    max_layer_height = std::max(max_layer_height, max_object_layer_height);
-
     for (size_t i = 0; i + 1 < m_layer_tools.size(); ++ i) {
         const LayerTools &lt      = m_layer_tools[i];
         const LayerTools &lt_next = m_layer_tools[i + 1];
@@ -460,6 +469,48 @@ void ToolOrdering::collect_extruder_statistics(bool prime_multi_material)
     }
 }
 
+// Layers are marked for infinite skirt aka draft shield. Not all the layers have to be printed.
+void ToolOrdering::mark_skirt_layers(const PrintConfig &config, coordf_t max_layer_height)
+{
+    if (m_layer_tools.empty())
+        return;
+
+    if (m_layer_tools.front().extruders.empty()) {
+        // Empty first layer, no skirt will be printed.
+        //FIXME throw an exception?
+        return;
+    }
+
+    size_t i = 0;
+    for (;;) {
+        m_layer_tools[i].has_skirt = true;
+        size_t j = i + 1;
+        for (; j < m_layer_tools.size() && ! m_layer_tools[j].has_object; ++ j);
+        // i and j are two successive layers printing an object.
+        if (j == m_layer_tools.size())
+            // Don't print skirt above the last object layer.
+            break;
+        // Mark some printing intermediate layers as having skirt.
+        double last_z = m_layer_tools[i].print_z;
+        for (size_t k = i + 1; k < j; ++ k) {
+            if (m_layer_tools[k + 1].print_z - last_z > max_layer_height + EPSILON) {
+                // Layer k is the last one not violating the maximum layer height.
+                // Don't extrude skirt on empty layers.
+                while (m_layer_tools[k].extruders.empty())
+                    -- k;
+                if (m_layer_tools[k].has_skirt) {
+                    // Skirt cannot be generated due to empty layers, there would be a missing layer in the skirt.
+                    //FIXME throw an exception?
+                    break;
+                }
+                m_layer_tools[k].has_skirt = true;
+                last_z = m_layer_tools[k].print_z;
+            }
+        }
+        i = j;
+    }
+}
+
 // Assign a pointer to a custom G-code to the respective ToolOrdering::LayerTools.
 // Ignore color changes, which are performed on a layer and for such an extruder, that the extruder will not be printing above that layer.
 // If multiple events are planned over a span of a single layer, use the last one.
diff --git a/src/libslic3r/GCode/ToolOrdering.hpp b/src/libslic3r/GCode/ToolOrdering.hpp
index e2e07533f..036730325 100644
--- a/src/libslic3r/GCode/ToolOrdering.hpp
+++ b/src/libslic3r/GCode/ToolOrdering.hpp
@@ -17,8 +17,6 @@ class LayerTools;
 namespace CustomGCode { struct Item; }
 class PrintRegion;
 
-
-
 // Object of this class holds information about whether an extrusion is printed immediately
 // after a toolchange (as part of infill/perimeter wiping) or not. One extrusion can be a part
 // of several copies - this has to be taken into account.
@@ -69,8 +67,6 @@ private:
     const LayerTools* m_layer_tools = nullptr;    // so we know which LayerTools object this belongs to
 };
 
-
-
 class LayerTools
 {
 public:
@@ -99,6 +95,9 @@ public:
     // If per layer extruder switches are inserted by the G-code preview slider, this value contains the new (1 based) extruder, with which the whole object layer is being printed with.
     // If not overriden, it is set to 0.
     unsigned int 				extruder_override = 0;
+    // Should a skirt be printed at this layer?
+    // Layers are marked for infinite skirt aka draft shield. Not all the layers have to be printed.
+    bool                        has_skirt = false;
     // Will there be anything extruded on this layer for the wipe tower?
     // Due to the support layers possibly interleaving the object layers,
     // wipe tower will be disabled for some support only layers.
@@ -120,12 +119,10 @@ private:
     WipingExtrusions m_wiping_extrusions;
 };
 
-
-
 class ToolOrdering
 {
 public:
-    ToolOrdering() {}
+    ToolOrdering() = default;
 
     // For the use case when each object is printed separately
     // (print.config.complete_objects is true).
@@ -169,6 +166,7 @@ private:
     void 				collect_extruders(const PrintObject &object, const std::vector<std::pair<double, unsigned int>> &per_layer_extruder_switches);
     void				reorder_extruders(unsigned int last_extruder_id);
     void 				fill_wipe_tower_partitions(const PrintConfig &config, coordf_t object_bottom_z, coordf_t max_layer_height);
+    void                mark_skirt_layers(const PrintConfig &config, coordf_t max_layer_height);
     void 				collect_extruder_statistics(bool prime_multi_material);
 
     std::vector<LayerTools>    m_layer_tools;
@@ -182,8 +180,6 @@ private:
     const PrintConfig*         m_print_config_ptr = nullptr;
 };
 
-
-
 } // namespace SLic3r
 
 #endif /* slic3r_ToolOrdering_hpp_ */
diff --git a/src/libslic3r/Geometry.cpp b/src/libslic3r/Geometry.cpp
index 45730dd9f..aac7c7752 100644
--- a/src/libslic3r/Geometry.cpp
+++ b/src/libslic3r/Geometry.cpp
@@ -245,8 +245,7 @@ Polygon convex_hull(Points points)
     return hull;
 }
 
-Pointf3s
-convex_hull(Pointf3s points)
+Pointf3s convex_hull(Pointf3s points)
 {
     assert(points.size() >= 3);
     // sort input points
@@ -304,8 +303,7 @@ convex_hull(Pointf3s points)
     return hull;
 }
 
-Polygon
-convex_hull(const Polygons &polygons)
+Polygon convex_hull(const Polygons &polygons)
 {
     Points pp;
     for (Polygons::const_iterator p = polygons.begin(); p != polygons.end(); ++p) {
diff --git a/src/libslic3r/MutablePolygon.cpp b/src/libslic3r/MutablePolygon.cpp
new file mode 100644
index 000000000..951485259
--- /dev/null
+++ b/src/libslic3r/MutablePolygon.cpp
@@ -0,0 +1,242 @@
+#include "MutablePolygon.hpp"
+#include "Line.hpp"
+
+namespace Slic3r {
+
+// Remove exact duplicate points. May reduce the polygon down to empty polygon.
+void remove_duplicates(MutablePolygon &polygon)
+{
+    if (! polygon.empty()) {
+        auto begin = polygon.begin();
+        auto it    = begin;
+        for (++ it; it != begin;) {
+            auto prev = it.prev();
+            if (*prev == *it)
+                it = it.remove();
+            else
+                ++ it;
+        }
+    }
+}
+
+// Remove nearly duplicate points. May reduce the polygon down to empty polygon.
+void remove_duplicates(MutablePolygon &polygon, double eps)
+{
+    if (! polygon.empty()) {
+        auto eps2 = eps * eps;
+        auto begin = polygon.begin();
+        auto it = begin;
+        for (++ it; it != begin;) {
+            auto prev = it.prev();
+            if ((*it - *prev).cast<double>().squaredNorm() < eps2)
+                it = it.remove();
+            else
+                ++ it;
+        }
+    }
+}
+
+// Sample a point on line (a, b) at distance "dist" from ref_pt.
+// If two points fulfill the condition, then the first one (closer to point a) is taken.
+// If none of the two points falls on line (a, b), return false.
+template<typename VectorType>
+static inline VectorType point_on_line_at_dist(const VectorType &a, const VectorType &b, const VectorType &ref_pt, const double dist)
+{
+    using T = typename VectorType::Scalar;
+    auto   v   = b - a;
+    auto   l2  = v.squaredNorm();
+    assert(l2 > T(0));
+    auto   vpt = ref_pt - a;
+    // Parameter of the foot point of ref_pt on line (a, b).
+    auto   t   = v.dot(vpt) / l2;
+    // Foot point of ref_pt on line (a, b).
+    auto   foot_pt = a + t * v;
+    auto   dfoot2 = vpt.squaredNorm() - (foot_pt - ref_pt).squaredNorm();
+    // Distance of the result point from the foot point, normalized to length of (a, b).
+    auto   dfoot  = dfoot2 > T(0) ? sqrt(dfoot2) / sqrt(l2) : T(0);
+    auto   t_result = t - dfoot;
+    if (t_result < T(0))
+        t_result = t + dfoot;
+    t_result = Slic3r::clamp(0., 1., t_result);
+    return a + v * t;
+}
+
+static bool smooth_corner_complex(const Vec2d p1, MutablePolygon::iterator &it0, MutablePolygon::iterator &it2, const double shortcut_length)
+{
+    // walk away from the corner until the shortcut > shortcut_length or it would smooth a piece inward
+    // - walk in both directions untill shortcut > shortcut_length
+    // - stop walking in one direction if it would otherwise cut off a corner in that direction
+    // - same in the other direction
+    // - stop if both are cut off
+    // walk by updating p0_it and p2_it
+    double shortcut_length2    = shortcut_length * shortcut_length;
+    bool   forward_is_blocked  = false;
+    bool   forward_is_too_far  = false;
+    bool   backward_is_blocked = false;
+    bool   backward_is_too_far = false;
+    for (;;) {
+        const bool forward_has_converged  = forward_is_blocked  || forward_is_too_far;
+        const bool backward_has_converged = backward_is_blocked || backward_is_too_far;
+        if (forward_has_converged && backward_has_converged) {
+            if (forward_is_too_far && backward_is_too_far && (*it0.prev() - *it2.next()).cast<double>().squaredNorm() < shortcut_length2) {
+                // Trim the narrowing region.
+                -- it0;
+                ++ it2;
+                forward_is_too_far  = false;
+                backward_is_too_far = false;
+                continue;
+            } else
+                break;
+        }
+
+        const Vec2d p0 = it0->cast<double>();
+        const Vec2d p2 = it2->cast<double>();
+        if (! forward_has_converged && (backward_has_converged || (p2 - p1).squaredNorm() < (p0 - p1).squaredNorm())) {
+            // walk forward
+            const auto  it2_2 = it2.next();
+            const Vec2d p2_2  = it2_2->cast<double>();
+            if (cross2(p2 - p0, p2_2 - p0) > 0) {
+                forward_is_blocked  = true;
+            } else if ((p2_2 - p0).squaredNorm() > shortcut_length2) {
+                forward_is_too_far  = true;
+            } else {
+                it2                 = it2_2; // make one step in the forward direction
+                backward_is_blocked = false; // invalidate data about backward walking
+                backward_is_too_far = false;
+            }
+        } else {
+            // walk backward
+            const auto  it0_2 = it0.prev();
+            const Vec2d p0_2  = it0_2->cast<double>();
+            if (cross2(p0_2 - p0, p2 - p0_2) > 0) {
+                backward_is_blocked = true;
+            } else if ((p2 - p0_2).squaredNorm() > shortcut_length2) {
+                backward_is_too_far = true;
+            } else {
+                it0                = it0_2; // make one step in the backward direction
+                forward_is_blocked = false; // invalidate data about forward walking
+                forward_is_too_far = false;
+            }
+        }
+
+        if (it0.prev() == it2 || it0 == it2) {
+            // stop if we went all the way around the polygon
+            // this should only be the case for hole polygons (?)
+            if (forward_is_too_far && backward_is_too_far) {
+                // in case p0_it.prev() == p2_it :
+                //     /                                                .
+                //    /                /|
+                //   |       becomes  | |
+                //    \                \|
+                //     \                                                .
+                // in case p0_it == p2_it :
+                //     /                                                .
+                //    /    becomes     /|
+                //    \                \|
+                //     \                                                .
+                break;
+            } else {
+                // this whole polygon can be removed
+                return true;
+            }
+        }
+    }
+
+    const Vec2d   p0     = it0->cast<double>();
+    const Vec2d   p2     = it2->cast<double>();
+    const Vec2d   v02    = p2 - p0;
+    const int64_t l2_v02 = v02.squaredNorm();
+    if (std::abs(l2_v02 - shortcut_length2) < shortcut_length * 10) // i.e. if (size2 < l * (l+10) && size2 > l * (l-10))
+    { // v02 is approximately shortcut length
+        // handle this separately to avoid rounding problems below in the getPointOnLineWithDist function
+        // p0_it and p2_it are already correct
+    } else if (! backward_is_blocked && ! forward_is_blocked) {
+        const auto  l_v02 = sqrt(l2_v02);
+        const Vec2d p0_2  = it0.prev()->cast<double>();
+        const Vec2d p2_2  = it2.next()->cast<double>();
+        double t = Slic3r::clamp(0., 1., (shortcut_length - l_v02) / ((p2_2 - p0_2).norm() - l_v02));
+        it0 = it0.prev().insert((p0 + (p0_2 - p0) * t).cast<coord_t>());
+        it2 = it2.insert((p2 + (p2_2 - p2) * t).cast<coord_t>());
+    } else if (! backward_is_blocked) {
+        it0 = it0.prev().insert(point_on_line_at_dist(p0, Vec2d(it0.prev()->cast<double>()), p2, shortcut_length).cast<coord_t>());
+    } else if (! forward_is_blocked) {
+        it2 = it2.insert(point_on_line_at_dist(p2, Vec2d(it2.next()->cast<double>()), p0, shortcut_length).cast<coord_t>());
+    } else {
+        //        |
+        //      __|2
+        //     | /  > shortcut cannot be of the desired length
+        //  ___|/                                                       .
+        //     0
+        // both are blocked and p0_it and p2_it are already correct
+    }
+    // Delete all the points between it0 and it2.
+    while (it0.next() != it2)
+        it0.next().remove();
+    return false;
+}
+
+void smooth_outward(MutablePolygon &polygon, double shortcut_length)
+{
+    remove_duplicates(polygon, scaled<double>(0.01));
+
+    const int                     shortcut_length2 = shortcut_length * shortcut_length;
+    static constexpr const double cos_min_angle    = -0.70710678118654752440084436210485; // cos(135 degrees)
+
+    MutablePolygon::iterator it1 = polygon.begin();
+    do {
+        const Vec2d p1  = it1->cast<double>();
+        auto        it0 = it1.prev();
+        auto        it2 = it1.next();
+        const Vec2d p0  = it0->cast<double>();
+        const Vec2d p2  = it2->cast<double>();
+        const Vec2d v1  = p0 - p1;
+        const Vec2d v2  = p2 - p1;
+        const double cos_angle = v1.dot(v2);
+        if (cos_angle < cos_min_angle && cross2(v1, v2) < 0) {
+            // Simplify the sharp angle.
+            const Vec2d  v02   = p2 - p0;
+            const double l2_v02 = v02.squaredNorm();
+            if (l2_v02 >= shortcut_length2) {
+                // Trim an obtuse corner.
+                it1.remove();
+                if (l2_v02 > Slic3r::sqr(shortcut_length + SCALED_EPSILON)) {
+                    double l2_1 = v1.squaredNorm();
+                    double l2_2 = v2.squaredNorm();
+                    bool trim = true;
+                    if (cos_angle > 0.9999) {
+                        // The triangle p0, p1, p2 is likely degenerate.
+                        // Measure height of the triangle.
+                        double d2 = l2_1 > l2_2 ? line_alg::distance_to_squared(Linef{ p0, p1 }, p2) : line_alg::distance_to_squared(Linef{ p2, p1 }, p0);
+                        if (d2 < Slic3r::sqr(scaled<double>(0.02)))
+                            trim = false;
+                    }
+                    if (trim) {
+                        Vec2d  bisector  = v1 / l2_1 + v2 / l2_2;
+                        double d1        = v1.dot(bisector) / l2_1;
+                        double d2        = v2.dot(bisector) / l2_2;
+                        double lbisector = bisector.norm();
+                        if (d1 < shortcut_length && d2 < shortcut_length) {
+                            it0.insert((p1 + v1 * (shortcut_length / d1)).cast<coord_t>())
+                               .insert((p1 + v2 * (shortcut_length / d2)).cast<coord_t>());
+                        } else if (v1.squaredNorm() < v2.squaredNorm())
+                            it0.insert(point_on_line_at_dist(p1, p2, p0, shortcut_length).cast<coord_t>());
+                        else
+                            it0.insert(point_on_line_at_dist(p1, p0, p2, shortcut_length).cast<coord_t>());
+                    }
+                }
+            } else {
+                bool remove_poly = smooth_corner_complex(p1, it0, it2, shortcut_length); // edits p0_it and p2_it!
+                if (remove_poly) {
+                    // don't convert ListPolygon into result
+                    return;
+                }
+            }
+            // update:
+            it1 = it2; // next point to consider for whether it's an internal corner
+        }
+        else
+            ++ it1;
+    } while (it1 != polygon.begin());
+}
+
+} // namespace Slic3r
diff --git a/src/libslic3r/MutablePolygon.hpp b/src/libslic3r/MutablePolygon.hpp
new file mode 100644
index 000000000..f40b89e74
--- /dev/null
+++ b/src/libslic3r/MutablePolygon.hpp
@@ -0,0 +1,227 @@
+#ifndef slic3r_MutablePolygon_hpp_
+#define slic3r_MutablePolygon_hpp_
+
+#include "Point.hpp"
+#include "Polygon.hpp"
+
+namespace Slic3r {
+
+class MutablePolygon
+{
+public:
+    using IndexType = int32_t;
+    using PointType = Point;
+    class const_iterator {
+    public:
+        bool             operator==(const const_iterator &rhs) const { assert(m_data == rhs.m_data); assert(this->valid()); return m_idx == rhs.m_idx; }
+        bool             operator!=(const const_iterator &rhs) const { return ! (*this == rhs); }
+        const_iterator&  operator--()    { assert(this->valid()); m_idx = m_data->at(m_idx).prev; return *this; }
+        const_iterator   operator--(int) { const_iterator result(*this); --(*this); return result; }
+        const_iterator&  operator++()    { assert(this->valid()); m_idx = m_data->at(m_idx).next; return *this; }
+        const_iterator   operator++(int) { const_iterator result(*this); ++(*this); return result; }
+        const_iterator   prev()    const { assert(this->valid()); return { m_data, m_data->at(m_idx).prev }; }
+        const_iterator   next()    const { assert(this->valid()); return { m_data, m_data->at(m_idx).next }; }
+        bool             valid()   const { return m_idx >= 0; }
+        const PointType& operator*() const { return m_data->at(m_idx).point; }
+        const PointType* operator->() const { return &m_data->at(m_idx).point; }
+        const MutablePolygon& polygon() const { assert(this->valid()); return *m_data; }
+        IndexType        size()    const { assert(this->valid()); return m_data->size(); }
+    private:
+        const_iterator(const MutablePolygon *data, IndexType idx) : m_data(data), m_idx(idx) {}
+        friend class MutablePolygon;
+        const MutablePolygon  *m_data;
+        IndexType              m_idx;
+    };
+
+    class iterator {
+    public:
+        bool            operator==(const iterator &rhs) const { assert(m_data == rhs.m_data); assert(this->valid()); return m_idx == rhs.m_idx; }
+        bool            operator!=(const iterator &rhs) const { return !(*this == rhs); }
+        iterator&       operator--()    { assert(this->valid()); m_idx = m_data->at(m_idx).prev; return *this; }
+        iterator        operator--(int) { iterator result(*this); --(*this); return result; }
+        iterator&       operator++()    { assert(this->valid()); m_idx = m_data->at(m_idx).next; return *this; }
+        iterator        operator++(int) { iterator result(*this); ++(*this); return result; }
+        iterator        prev()    const { assert(this->valid()); return { m_data, m_data->at(m_idx).prev }; }
+        iterator        next()    const { assert(this->valid()); return { m_data, m_data->at(m_idx).next }; }
+        bool            valid()   const { return m_idx >= 0; }
+        PointType&      operator*() const { return m_data->at(m_idx).point; }
+        PointType*      operator->() const { return &m_data->at(m_idx).point; }
+        MutablePolygon& polygon() const { assert(this->valid()); return *m_data; }
+        IndexType       size()    const { assert(this->valid()); return m_data->size(); }
+        iterator&       remove()        { this->m_idx = m_data->remove(*this).m_idx; return *this; }
+        iterator        insert(const PointType pt) const { return m_data->insert(*this, pt); }
+    private:
+        iterator(MutablePolygon *data, IndexType idx) : m_data(data), m_idx(idx) {}
+        friend class MutablePolygon;
+        MutablePolygon  *m_data;
+        IndexType        m_idx;
+    };
+
+    MutablePolygon() = default;
+    MutablePolygon(const Polygon &rhs, size_t reserve = 0) : MutablePolygon(rhs.points.begin(), rhs.points.end(), reserve) {}
+    MutablePolygon(std::initializer_list<Point> rhs, size_t reserve = 0) : MutablePolygon(rhs.begin(), rhs.end(), reserve) {}
+
+    template<typename IT>
+    MutablePolygon(IT begin, IT end, size_t reserve = 0) {
+        m_size = IndexType(end - begin);
+        if (m_size > 0) {
+            m_head = 0;
+            m_data.reserve(std::max<size_t>(m_size, reserve));
+            auto i = IndexType(-1);
+            auto j = IndexType(1);
+            for (auto it = begin; it != end; ++ it)
+                m_data.push_back({ *it, i ++, j ++ });
+            m_data.front().prev = m_size - 1;
+            m_data.back ().next = 0;
+        }
+    };
+
+    Polygon polygon() const {
+        Polygon out;
+        if (this->valid()) {
+            out.points.reserve(this->size());
+            for (auto it = this->cbegin(); it != this->cend(); ++ it)
+                out.points.emplace_back(*it);
+        }
+        return out;
+    };
+
+    bool            empty()  const { return this->m_size == 0; }
+    size_t          size()   const { return this->m_size; }
+    size_t          capacity() const { return this->m_data.capacity(); }
+    bool            valid()  const { return this->m_size >= 3; }
+
+    iterator        begin()        { return { this, m_head }; }
+    const_iterator  cbegin() const { return { this, m_head }; }
+    const_iterator  begin()  const { return this->cbegin(); }
+    // End points to the last item before roll over. This is different from the usual end() concept!
+    iterator        end()          { return { this, this->empty() ? -1 : this->at(m_head).prev }; }
+    const_iterator  cend()   const { return { this, this->empty() ? -1 : this->at(m_head).prev }; }
+    const_iterator  end()    const { return this->cend(); }
+
+    // Returns iterator following the removed element. Returned iterator will become invalid if last point is removed.
+    // If begin() is removed, then the next element will become the new begin().
+    iterator        remove(const iterator it) { assert(it.m_data == this); return { this, this->remove(it.m_idx) }; }
+    // Insert a new point before it. Returns iterator to the newly inserted point.
+    // begin() will not change, end() may point to the newly inserted point.
+    iterator        insert(const iterator it, const PointType pt) { assert(it.m_data == this); return { this, this->insert(it.m_idx, pt) }; }
+
+private:
+    struct LinkedPoint {
+        PointType point;
+        IndexType prev;
+        IndexType next;
+    };
+    std::vector<LinkedPoint>    m_data;
+    // Number of points in the linked list.
+    IndexType                   m_size { 0 };
+    IndexType                   m_head { IndexType(-1) };
+    // Head of the free list.
+    IndexType                   m_head_free { IndexType(-1) };
+
+    LinkedPoint&          at(IndexType i)       { return m_data[i]; }
+    const LinkedPoint&    at(IndexType i) const { return m_data[i]; }
+
+    IndexType remove(const IndexType i) {
+        assert(i >= 0);
+        assert(m_size > 0);
+        assert(m_head != -1);
+        LinkedPoint &lp = this->at(i);
+        IndexType prev = lp.prev;
+        IndexType next = lp.next;
+        lp.next = m_head_free;
+        m_head_free = i;
+        if (-- m_size == 0)
+            m_head = -1;
+        else if (m_head == i)
+            m_head = next;
+        assert(! this->empty() || (prev == i && next == i));
+        if (this->empty())
+            return IndexType(-1);
+        this->at(prev).next = next;
+        this->at(next).prev = prev;
+        return next;
+    }
+
+    IndexType insert(const IndexType i, const Point pt) {
+        assert(i >= 0);
+        IndexType n;
+        IndexType j = this->at(i).prev;
+        if (m_head_free == -1) {
+            // Allocate a new item.
+            n = IndexType(m_data.size());
+            m_data.push_back({ pt, j, i });
+        } else {
+            n = m_head_free;
+            LinkedPoint &nlp = this->at(n);
+            m_head_free = nlp.next;
+            nlp = { pt, j, i };
+        }
+        this->at(j).next = n;
+        this->at(i).prev = n;
+        ++ m_size;
+        return n;
+    }
+
+    /*
+    IndexType insert(const IndexType i, const Point pt) {
+        assert(i >= 0);
+        if (this->at(i).point == pt)
+            return i;
+        IndexType j = this->at(i).next;
+        if (this->at(j).point == pt)
+            return i;
+        IndexType n;
+        if (m_head_free == -1) {
+            // Allocate a new item.
+            n = IndexType(m_data.size());
+            m_data.push_back({ pt, i, j });
+        } else {
+            LinkedPoint &nlp = this->at(m_head_free);
+            m_head_free = nlp.next;
+            nlp = { pt, i, j };
+        }
+        this->at(i).next = n;
+        this->at(j).prev = n;
+        ++ m_size;
+        return n;
+    }
+    */
+};
+
+inline bool operator==(const MutablePolygon &p1, const MutablePolygon &p2) 
+{ 
+    if (p1.size() != p2.size())
+        return false;
+    if (p1.empty())
+        return true;
+    auto begin = p1.cbegin();
+    auto it  = begin;
+    auto it2 = p2.cbegin();
+    for (;;) {
+        if (! (*it == *it2))
+            return false;
+        if (++ it == begin)
+            return true;
+        ++ it2;
+    }
+}
+
+inline bool operator!=(const MutablePolygon &p1, const MutablePolygon &p2) { return ! (p1 == p2); }
+
+// Remove exact duplicate points. May reduce the polygon down to empty polygon.
+void remove_duplicates(MutablePolygon &polygon);
+void remove_duplicates(MutablePolygon &polygon, double eps);
+
+void smooth_outward(MutablePolygon &polygon, double shortcut_length);
+
+inline Polygon smooth_outward(const Polygon &polygon, double shortcut_length) 
+{ 
+    MutablePolygon mp(polygon, polygon.size() * 2);
+    smooth_outward(mp, shortcut_length);
+    return mp.polygon();
+}
+
+}
+
+#endif // slic3r_MutablePolygon_hpp_
diff --git a/src/libslic3r/Point.hpp b/src/libslic3r/Point.hpp
index d11af8b58..84b4a825d 100644
--- a/src/libslic3r/Point.hpp
+++ b/src/libslic3r/Point.hpp
@@ -56,11 +56,21 @@ typedef Eigen::Transform<double, 3, Eigen::Affine, Eigen::DontAlign> Transform3d
 
 inline bool operator<(const Vec2d &lhs, const Vec2d &rhs) { return lhs(0) < rhs(0) || (lhs(0) == rhs(0) && lhs(1) < rhs(1)); }
 
-// One likely does not want to perform the cross product with a 32bit accumulator.
-//inline int32_t cross2(const Vec2i32 &v1, const Vec2i32 &v2) { return v1(0) * v2(1) - v1(1) * v2(0); }
-inline int64_t cross2(const Vec2i64 &v1, const Vec2i64 &v2) { return v1(0) * v2(1) - v1(1) * v2(0); }
-inline float   cross2(const Vec2f   &v1, const Vec2f   &v2) { return v1(0) * v2(1) - v1(1) * v2(0); }
-inline double  cross2(const Vec2d   &v1, const Vec2d   &v2) { return v1(0) * v2(1) - v1(1) * v2(0); }
+template<int Options>
+int32_t cross2(const Eigen::MatrixBase<Eigen::Matrix<int32_t, 2, 1, Options>> &v1, const Eigen::MatrixBase<Eigen::Matrix<int32_t, 2, 1, Options>> &v2) = delete;
+
+template<typename T, int Options>
+inline T cross2(const Eigen::MatrixBase<Eigen::Matrix<T, 2, 1, Options>> &v1, const Eigen::MatrixBase<Eigen::Matrix<T, 2, 1, Options>> &v2)
+{
+    return v1(0) * v2(1) - v1(1) * v2(0);
+}
+
+template<typename Derived, typename Derived2>
+inline typename Derived::Scalar cross2(const Eigen::MatrixBase<Derived> &v1, const Eigen::MatrixBase<Derived2> &v2)
+{
+    static_assert(std::is_same<typename Derived::Scalar, typename Derived2::Scalar>::value, "cross2(): Scalar types of 1st and 2nd operand must be equal.");
+    return v1(0) * v2(1) - v1(1) * v2(0);
+}
 
 template<typename T, int Options>
 inline Eigen::Matrix<T, 2, 1, Eigen::DontAlign> perp(const Eigen::MatrixBase<Eigen::Matrix<T, 2, 1, Options>> &v) { return Eigen::Matrix<T, 2, 1, Eigen::DontAlign>(- v.y(), v.x()); }
diff --git a/src/libslic3r/Preset.cpp b/src/libslic3r/Preset.cpp
index 6c500b84a..98ccf280f 100644
--- a/src/libslic3r/Preset.cpp
+++ b/src/libslic3r/Preset.cpp
@@ -1393,9 +1393,8 @@ const std::vector<std::string>& PhysicalPrinter::printer_options()
     static std::vector<std::string> s_opts;
     if (s_opts.empty()) {
         s_opts = {
-            "preset_name",
+            "preset_names",
             "printer_technology",
-//            "printer_model",
             "host_type",
             "print_host",
             "printhost_apikey",
@@ -1453,11 +1452,10 @@ bool PhysicalPrinter::has_empty_config() const
 void PhysicalPrinter::update_preset_names_in_config()
 {
     if (!preset_names.empty()) {
-        std::string name;
-        for (auto el : preset_names)
-            name += el + ";";
-        name.pop_back();
-        config.set_key_value("preset_name", new ConfigOptionString(name));
+        std::vector<std::string>& values = config.option<ConfigOptionStrings>("preset_names")->values;
+        values.clear();
+        for (auto preset : preset_names)
+            values.push_back(preset);
     }
 }
 
@@ -1482,14 +1480,13 @@ void PhysicalPrinter::update_from_config(const DynamicPrintConfig& new_config)
 {
     config.apply_only(new_config, printer_options(), false);
 
-    std::string str = config.opt_string("preset_name");
-    std::set<std::string> values{};
-    if (!str.empty()) {
-        boost::split(values, str, boost::is_any_of(";"));
+    const std::vector<std::string>& values = config.option<ConfigOptionStrings>("preset_names")->values;
+
+    if (values.empty())
+        preset_names.clear();
+    else
         for (const std::string& val : values)
             preset_names.emplace(val);
-    }
-    preset_names = values;
 }
 
 void PhysicalPrinter::reset_presets()
@@ -1817,7 +1814,7 @@ bool PhysicalPrinterCollection::delete_preset_from_printers( const std::string&
     return true;
 }
 
-// Get list of printers which have more than one preset and "preset_name" preset is one of them
+// Get list of printers which have more than one preset and "preset_names" preset is one of them
 std::vector<std::string> PhysicalPrinterCollection::get_printers_with_preset(const std::string& preset_name)
 {
     std::vector<std::string> printers;
@@ -1832,7 +1829,7 @@ std::vector<std::string> PhysicalPrinterCollection::get_printers_with_preset(con
     return printers;
 }
 
-// Get list of printers which has only "preset_name" preset
+// Get list of printers which has only "preset_names" preset
 std::vector<std::string> PhysicalPrinterCollection::get_printers_with_only_preset(const std::string& preset_name)
 {
     std::vector<std::string> printers;
diff --git a/src/libslic3r/Preset.hpp b/src/libslic3r/Preset.hpp
index d81717f0e..6e56ad911 100644
--- a/src/libslic3r/Preset.hpp
+++ b/src/libslic3r/Preset.hpp
@@ -685,9 +685,9 @@ public:
     // returns true if all presets were deleted successfully.
     bool            delete_preset_from_printers(const std::string& preset_name);
 
-    // Get list of printers which have more than one preset and "preset_name" preset is one of them
+    // Get list of printers which have more than one preset and "preset_names" preset is one of them
     std::vector<std::string> get_printers_with_preset( const std::string &preset_name);
-    // Get list of printers which has only "preset_name" preset
+    // Get list of printers which has only "preset_names" preset
     std::vector<std::string> get_printers_with_only_preset( const std::string &preset_name);
 
     // Return the selected preset, without the user modifications applied.
diff --git a/src/libslic3r/PresetBundle.cpp b/src/libslic3r/PresetBundle.cpp
index 7d08c9359..e7f818d08 100644
--- a/src/libslic3r/PresetBundle.cpp
+++ b/src/libslic3r/PresetBundle.cpp
@@ -876,6 +876,7 @@ void PresetBundle::load_config_file_config(const std::string &name_or_path, bool
                 this->filament_presets[i] = loaded->name;
             }
         }
+
         // 4) Load the project config values (the per extruder wipe matrix etc).
         this->project_config.apply_only(config, s_project_options);
 
diff --git a/src/libslic3r/PrintBase.cpp b/src/libslic3r/PrintBase.cpp
index 721741d4a..d129aaad2 100644
--- a/src/libslic3r/PrintBase.cpp
+++ b/src/libslic3r/PrintBase.cpp
@@ -94,12 +94,14 @@ std::string PrintBase::output_filepath(const std::string &path, const std::strin
     return path;
 }
 
-void PrintBase::status_update_warnings(ObjectID object_id, int step, PrintStateBase::WarningLevel /* warning_level */, const std::string &message)
+void PrintBase::status_update_warnings(int step, PrintStateBase::WarningLevel /* warning_level */, const std::string &message, const PrintObjectBase* print_object)
 {
-    if (this->m_status_callback)
-        m_status_callback(SlicingStatus(*this, step));
+    if (this->m_status_callback) {
+        auto status = print_object ? SlicingStatus(*print_object, step) : SlicingStatus(*this, step);
+        m_status_callback(status);
+    }
     else if (! message.empty())
-    	printf("%s warning: %s\n", (object_id == this->id()) ? "print" : "print object", message.c_str());
+        printf("%s warning: %s\n",  print_object ? "print_object" : "print", message.c_str());
 }
 
 tbb::mutex& PrintObjectBase::state_mutex(PrintBase *print)
@@ -114,7 +116,7 @@ std::function<void()> PrintObjectBase::cancel_callback(PrintBase *print)
 
 void PrintObjectBase::status_update_warnings(PrintBase *print, int step, PrintStateBase::WarningLevel warning_level, const std::string &message)
 {
-	print->status_update_warnings(this->id(), step, warning_level, message);
+    print->status_update_warnings(step, warning_level, message, this);
 }
 
 } // namespace Slic3r
diff --git a/src/libslic3r/PrintBase.hpp b/src/libslic3r/PrintBase.hpp
index 8fca43319..2aff13ae9 100644
--- a/src/libslic3r/PrintBase.hpp
+++ b/src/libslic3r/PrintBase.hpp
@@ -481,7 +481,7 @@ protected:
 	// Notify UI about a new warning of a milestone "step" on this PrintBase.
 	// The UI will be notified by calling a status callback.
 	// If no status callback is registered, the message is printed to console.
-	void 				   status_update_warnings(ObjectID object_id, int step, PrintStateBase::WarningLevel warning_level, const std::string &message);
+    void 				   status_update_warnings(int step, PrintStateBase::WarningLevel warning_level, const std::string &message, const PrintObjectBase* print_object = nullptr);
 
     // If the background processing stop was requested, throw CanceledException.
     // To be called by the worker thread and its sub-threads (mostly launched on the TBB thread pool) regularly.
@@ -528,7 +528,7 @@ protected:
 	PrintStateBase::TimeStamp set_done(PrintStepEnum step) { 
 		std::pair<PrintStateBase::TimeStamp, bool> status = m_state.set_done(step, this->state_mutex(), [this](){ this->throw_if_canceled(); });
         if (status.second)
-            this->status_update_warnings(this->id(), static_cast<int>(step), PrintStateBase::WarningLevel::NON_CRITICAL, std::string());
+            this->status_update_warnings(static_cast<int>(step), PrintStateBase::WarningLevel::NON_CRITICAL, std::string());
         return status.first;
 	}
     bool            invalidate_step(PrintStepEnum step)
@@ -550,7 +550,7 @@ protected:
     	std::pair<PrintStepEnum, bool> active_step = m_state.active_step_add_warning(warning_level, message, message_id, this->state_mutex());
     	if (active_step.second)
     		// Update UI.
-    		this->status_update_warnings(this->id(), static_cast<int>(active_step.first), warning_level, message);
+            this->status_update_warnings(static_cast<int>(active_step.first), warning_level, message);
     }
 
 private:
diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index 480ce4590..810b651c4 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -151,11 +151,11 @@ void PrintConfigDef::init_common_params()
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionString(""));
     
-    def = this->add("preset_name", coString);
-    def->label = L("Printer preset name");
-    def->tooltip = L("Related printer preset name");
+    def = this->add("preset_names", coStrings);
+    def->label = L("Printer preset names");
+    def->tooltip = L("Names of presets related to the physical printer");
     def->mode = comAdvanced;
-    def->set_default_value(new ConfigOptionString(""));
+    def->set_default_value(new ConfigOptionStrings());
 
     def = this->add("printhost_authorization_type", coEnum);
     def->label = L("Authorization Type");
@@ -3366,6 +3366,8 @@ void PrintConfigDef::handle_legacy(t_config_option_key &opt_key, std::string &va
         opt_key = "printhost_cafile";
     } else if (opt_key == "octoprint_apikey") {
         opt_key = "printhost_apikey";
+    } else if (opt_key == "preset_name") {
+        opt_key = "preset_names";
     }
 
     // Ignore the following obsolete configuration keys:
diff --git a/src/libslic3r/PrintConfig.hpp b/src/libslic3r/PrintConfig.hpp
index f56316356..c1e3f82cb 100644
--- a/src/libslic3r/PrintConfig.hpp
+++ b/src/libslic3r/PrintConfig.hpp
@@ -513,7 +513,7 @@ public:
     ConfigOptionFloat               support_material_interface_spacing;
     ConfigOptionFloatOrPercent      support_material_interface_speed;
     ConfigOptionEnum<SupportMaterialPattern> support_material_pattern;
-    ConfigOptionEnum<SupportMaterialPattern> support_material_interface_pattern;
+    ConfigOptionEnum<SupportMaterialInterfacePattern> support_material_interface_pattern;
     // Spacing between support material lines (the hatching distance).
     ConfigOptionFloat               support_material_spacing;
     ConfigOptionFloat               support_material_speed;
diff --git a/src/libslic3r/PrintObject.cpp b/src/libslic3r/PrintObject.cpp
index 84fdf3f62..c963418c3 100644
--- a/src/libslic3r/PrintObject.cpp
+++ b/src/libslic3r/PrintObject.cpp
@@ -418,7 +418,7 @@ void PrintObject::generate_support_material()
 {
     if (this->set_started(posSupportMaterial)) {
         this->clear_support_layers();
-        if (this->has_support_material() && m_layers.size() > 1) {
+        if ((this->has_support() && m_layers.size() > 1) || (this->has_raft() && ! m_layers.empty())) {
             m_print->set_status(85, L("Generating support material"));    
             this->_generate_support_material();
             m_print->throw_if_canceled();
diff --git a/src/libslic3r/SupportMaterial.cpp b/src/libslic3r/SupportMaterial.cpp
index cbe9ffb1b..459a15603 100644
--- a/src/libslic3r/SupportMaterial.cpp
+++ b/src/libslic3r/SupportMaterial.cpp
@@ -501,7 +501,7 @@ void PrintObjectSupportMaterial::generate(PrintObject &object)
     // If raft is to be generated, the 1st top_contact layer will contain the 1st object layer silhouette with holes filled.
     // There is also a 1st intermediate layer containing bases of support columns.
     // Inflate the bases of the support columns and create the raft base under the object.
-    MyLayersPtr raft_layers = this->generate_raft_base(object, top_contacts, interface_layers, intermediate_layers, layer_storage);
+    MyLayersPtr raft_layers = this->generate_raft_base(object, top_contacts, interface_layers, intermediate_layers, base_interface_layers, layer_storage);
 
 #ifdef SLIC3R_DEBUG
     for (const MyLayer *l : interface_layers)
@@ -1264,6 +1264,14 @@ namespace SupportMaterialInternal {
                 offset(layerm->unsupported_bridge_edges, scale_(SUPPORT_MATERIAL_MARGIN), SUPPORT_SURFACES_OFFSET_PARAMETERS));
         // Remove bridged areas from the supported areas.
         contact_polygons = diff(contact_polygons, bridges, true);
+
+        #ifdef SLIC3R_DEBUG
+            static int iRun = 0;
+            SVG::export_expolygons(debug_out_path("support-top-contacts-remove-bridges-run%d.svg", iRun ++),
+                { { { union_ex(offset(layerm->unsupported_bridge_edges, scale_(SUPPORT_MATERIAL_MARGIN), SUPPORT_SURFACES_OFFSET_PARAMETERS), false) }, { "unsupported_bridge_edges", "orange", 0.5f } },
+                  { { union_ex(contact_polygons, false) },            { "contact_polygons",           "blue",   0.5f } },
+                  { { union_ex(bridges, false) },                     { "bridges",                    "red",    "black", "", scaled<coord_t>(0.1f), 0.5f } } });
+        #endif /* SLIC3R_DEBUG */
     }
 }
 
@@ -1678,7 +1686,7 @@ PrintObjectSupportMaterial::MyLayersPtr PrintObjectSupportMaterial::top_contact_
                     #endif /* SLIC3R_DEBUG */
                         }
                     }
-                    #ifdef SLIC3R_DEBUG
+                #ifdef SLIC3R_DEBUG
                     SVG::export_expolygons(debug_out_path("support-top-contacts-final0-run%d-layer%d-z%f.svg", iRun, layer_id, layer.print_z),
                         { { { union_ex(lower_layer_polygons, false) },        { "lower_layer_polygons",       "gray",   0.2f } },
                           { { union_ex(*new_layer.contact_polygons, false) }, { "new_layer.contact_polygons", "yellow", 0.5f } },
@@ -2538,6 +2546,7 @@ PrintObjectSupportMaterial::MyLayersPtr PrintObjectSupportMaterial::generate_raf
     const PrintObject   &object,
     const MyLayersPtr   &top_contacts,
     const MyLayersPtr   &interface_layers,
+    const MyLayersPtr   &base_interface_layers,
     const MyLayersPtr   &base_layers,
     MyLayerStorage      &layer_storage) const
 {
@@ -2573,15 +2582,19 @@ PrintObjectSupportMaterial::MyLayersPtr PrintObjectSupportMaterial::generate_raf
     // How much to inflate the support columns to be stable. This also applies to the 1st layer, if no raft layers are to be printed.
     const float inflate_factor_fine      = float(scale_((m_slicing_params.raft_layers() > 1) ? 0.5 : EPSILON));
     const float inflate_factor_1st_layer = std::max(0.f, float(scale_(object.config().raft_first_layer_expansion)) - inflate_factor_fine);
-    MyLayer       *contacts      = top_contacts    .empty() ? nullptr : top_contacts    .front();
-    MyLayer       *interfaces    = interface_layers.empty() ? nullptr : interface_layers.front();
-    MyLayer       *columns_base  = base_layers     .empty() ? nullptr : base_layers     .front();
+    MyLayer       *contacts         = top_contacts         .empty() ? nullptr : top_contacts         .front();
+    MyLayer       *interfaces       = interface_layers     .empty() ? nullptr : interface_layers     .front();
+    MyLayer       *base_interfaces  = base_interface_layers.empty() ? nullptr : base_interface_layers.front();
+    MyLayer       *columns_base     = base_layers          .empty() ? nullptr : base_layers          .front();
     if (contacts != nullptr && contacts->print_z > std::max(m_slicing_params.first_print_layer_height, m_slicing_params.raft_contact_top_z) + EPSILON)
         // This is not the raft contact layer.
         contacts = nullptr;
     if (interfaces != nullptr && interfaces->bottom_print_z() > m_slicing_params.raft_interface_top_z + EPSILON)
         // This is not the raft column base layer.
         interfaces = nullptr;
+    if (base_interfaces != nullptr && base_interfaces->bottom_print_z() > m_slicing_params.raft_interface_top_z + EPSILON)
+        // This is not the raft column base layer.
+        base_interfaces = nullptr;
     if (columns_base != nullptr && columns_base->bottom_print_z() > m_slicing_params.raft_interface_top_z + EPSILON)
         // This is not the raft interface layer.
         columns_base = nullptr;
@@ -2591,6 +2604,8 @@ PrintObjectSupportMaterial::MyLayersPtr PrintObjectSupportMaterial::generate_raf
         polygons_append(interface_polygons, offset(contacts->polygons, inflate_factor_fine, SUPPORT_SURFACES_OFFSET_PARAMETERS));
     if (interfaces != nullptr && ! interfaces->polygons.empty())
         polygons_append(interface_polygons, offset(interfaces->polygons, inflate_factor_fine, SUPPORT_SURFACES_OFFSET_PARAMETERS));
+    if (base_interfaces != nullptr && ! base_interfaces->polygons.empty())
+        polygons_append(interface_polygons, offset(base_interfaces->polygons, inflate_factor_fine, SUPPORT_SURFACES_OFFSET_PARAMETERS));
  
     // Output vector.
     MyLayersPtr raft_layers;
@@ -2643,9 +2658,18 @@ PrintObjectSupportMaterial::MyLayersPtr PrintObjectSupportMaterial::generate_raf
         }
     } else if (columns_base != nullptr) {
         // Expand the bases of the support columns in the 1st layer.
-        columns_base->polygons = diff(
-            inflate_factor_1st_layer > 0 ? offset(columns_base->polygons, inflate_factor_1st_layer) : columns_base->polygons,
-            offset(m_object->layers().front()->lslices, (float)scale_(m_gap_xy), SUPPORT_SURFACES_OFFSET_PARAMETERS));
+        {
+            Polygons &raft     = columns_base->polygons;
+            Polygons  trimming = offset(m_object->layers().front()->lslices, (float)scale_(m_gap_xy), SUPPORT_SURFACES_OFFSET_PARAMETERS);
+            if (inflate_factor_1st_layer > SCALED_EPSILON) {
+                // Inflate in multiple steps to avoid leaking of the support 1st layer through object walls.
+                auto  nsteps = std::max(5, int(ceil(inflate_factor_1st_layer / m_first_layer_flow.scaled_width())));
+                float step   = inflate_factor_1st_layer / nsteps;
+                for (int i = 0; i < nsteps; ++ i)
+                    raft = diff(offset(raft, step), trimming);
+            } else
+                raft = diff(raft, trimming);
+        }
         if (contacts != nullptr)
             columns_base->polygons = diff(columns_base->polygons, interface_polygons);
         if (! brim.empty()) {
@@ -2654,6 +2678,8 @@ PrintObjectSupportMaterial::MyLayersPtr PrintObjectSupportMaterial::generate_raf
                 contacts->polygons = diff(contacts->polygons, brim);
             if (interfaces)
                 interfaces->polygons = diff(interfaces->polygons, brim);
+            if (base_interfaces)
+                base_interfaces->polygons = diff(base_interfaces->polygons, brim);
         }
     }
 
@@ -2706,7 +2732,7 @@ std::pair<PrintObjectSupportMaterial::MyLayersPtr, PrintObjectSupportMaterial::M
             layer_new.bridging   = intermediate_layer.bridging;
             // Merge top into bottom, unite them with a safety offset.
             append(bottom, std::move(top));
-            layer_new.polygons   = union_(std::move(bottom), true);
+            layer_new.polygons   = intersection(union_(std::move(bottom), true), intermediate_layer.polygons);
             // Subtract the interface from the base regions.
             intermediate_layer.polygons = diff(intermediate_layer.polygons, layer_new.polygons, false);
             if (subtract)
@@ -3564,8 +3590,7 @@ void PrintObjectSupportMaterial::generate_toolpaths(
                 // Base flange.
                 filler->angle = raft_angle_1st_layer;
                 filler->spacing = m_first_layer_flow.spacing();
-                // 70% of density on the 1st layer.
-                density       = 0.7f;
+                density       = float(m_object_config->raft_first_layer_density.value * 0.01);
             } else if (support_layer_id >= m_slicing_params.base_raft_layers) {
                 filler->angle = raft_angle_interface;
                 // We don't use $base_flow->spacing because we need a constant spacing
diff --git a/src/libslic3r/SupportMaterial.hpp b/src/libslic3r/SupportMaterial.hpp
index ddc5b944c..7123290a6 100644
--- a/src/libslic3r/SupportMaterial.hpp
+++ b/src/libslic3r/SupportMaterial.hpp
@@ -195,6 +195,7 @@ private:
     	const PrintObject   &object,
 	    const MyLayersPtr   &top_contacts,
 	    const MyLayersPtr   &interface_layers,
+	    const MyLayersPtr   &base_interface_layers,
 	    const MyLayersPtr   &base_layers,
 	    MyLayerStorage      &layer_storage) const;
 
diff --git a/src/libslic3r/Technologies.hpp b/src/libslic3r/Technologies.hpp
index e5b6bd9d6..c2139bb33 100644
--- a/src/libslic3r/Technologies.hpp
+++ b/src/libslic3r/Technologies.hpp
@@ -4,7 +4,6 @@
 //=============
 // debug techs
 //=============
-
 // Shows camera target in the 3D scene
 #define ENABLE_SHOW_CAMERA_TARGET 0
 // Log debug messages to console when changing selection
@@ -29,63 +28,12 @@
 #define ENABLE_GCODE_VIEWER_DATA_CHECKING 0
 
 
-//=================
-// 2.2.0.rc1 techs
-//=================
-#define ENABLE_2_2_0_RC1 1
-
-// Enable hack to remove crash when closing on OSX 10.9.5
-#define ENABLE_HACK_CLOSING_ON_OSX_10_9_5 (1 && ENABLE_2_2_0_RC1)
-
-
-//====================
-// 2.3.0.alpha1 techs
-//====================
-#define ENABLE_2_3_0_ALPHA1 1
-
 // Enable rendering of objects using environment map
-#define ENABLE_ENVIRONMENT_MAP (0 && ENABLE_2_3_0_ALPHA1)
-
+#define ENABLE_ENVIRONMENT_MAP 0
 // Enable smoothing of objects normals
-#define ENABLE_SMOOTH_NORMALS (0 && ENABLE_2_3_0_ALPHA1)
-
-// Enable error logging for OpenGL calls when SLIC3R_LOGLEVEL >= 5
-#define ENABLE_OPENGL_ERROR_LOGGING (1 && ENABLE_2_3_0_ALPHA1)
-
-// Enable built-in DPI changed event handler of wxWidgets 3.1.3
-#define ENABLE_WX_3_1_3_DPI_CHANGED_EVENT (1 && ENABLE_2_3_0_ALPHA1)
-
-
-//====================
-// 2.3.0.alpha3 techs
-//====================
-#define ENABLE_2_3_0_ALPHA3 1
-
-#define ENABLE_CTRL_M_ON_WINDOWS (1 && ENABLE_2_3_0_ALPHA3)
-
-
-//====================
-// 2.3.0.alpha4 techs
-//====================
-#define ENABLE_2_3_0_ALPHA4 1
-
-#define ENABLE_FIXED_SCREEN_SIZE_POINT_MARKERS (1 && ENABLE_2_3_0_ALPHA4)
-
-
-//===================
-// 2.3.0.beta1 techs
-//===================
-#define ENABLE_2_3_0_BETA1 1
-
-#define ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN (1 && ENABLE_2_3_0_BETA1)
-
-
-//=================
-// 2.3.0.rc1 techs
-//=================
-#define ENABLE_2_3_0_RC1 1
-
-#define ENABLE_VOLUMETRIC_EXTRUSION_PROCESSING (1 && ENABLE_2_3_0_RC1)
+#define ENABLE_SMOOTH_NORMALS 0
+// Enable rendering markers for options in preview as fixed screen size points
+#define ENABLE_FIXED_SCREEN_SIZE_POINT_MARKERS 1
 
 
 //====================
@@ -93,11 +41,17 @@
 //====================
 #define ENABLE_2_3_1_ALPHA1 1
 
+// Enable splitting of vertex buffers used to render toolpaths
 #define ENABLE_SPLITTED_VERTEX_BUFFER (1 && ENABLE_2_3_1_ALPHA1)
-#define ENABLE_RELOAD_FROM_DISK_FOR_3MF (1 && ENABLE_2_3_1_ALPHA1)
+// Enable rendering only starting and final caps for toolpaths
 #define ENABLE_REDUCED_TOOLPATHS_SEGMENT_CAPS (1 && ENABLE_SPLITTED_VERTEX_BUFFER)
+// Enable reload from disk command for 3mf files
+#define ENABLE_RELOAD_FROM_DISK_FOR_3MF (1 && ENABLE_2_3_1_ALPHA1)
+// Removes obsolete warning texture code
 #define ENABLE_WARNING_TEXTURE_REMOVAL (1 && ENABLE_2_3_1_ALPHA1)
+// Enable showing gcode line numbers in previeww horizontal slider
 #define ENABLE_GCODE_LINES_ID_IN_H_SLIDER (1 && ENABLE_2_3_1_ALPHA1)
+// Enable validation of custom gcode against gcode processor reserved keywords
 #define ENABLE_VALIDATE_CUSTOM_GCODE (1 && ENABLE_2_3_1_ALPHA1)
 #define ENABLE_GCODE_WINDOW (1 && ENABLE_2_3_1_ALPHA1)
 
diff --git a/src/slic3r/GUI/3DScene.cpp b/src/slic3r/GUI/3DScene.cpp
index 3aafc9a3b..04301061d 100644
--- a/src/slic3r/GUI/3DScene.cpp
+++ b/src/slic3r/GUI/3DScene.cpp
@@ -39,12 +39,11 @@
 #ifdef HAS_GLSAFE
 void glAssertRecentCallImpl(const char* file_name, unsigned int line, const char* function_name)
 {
-#if defined(NDEBUG) && ENABLE_OPENGL_ERROR_LOGGING
-    // In release mode, if OpenGL debugging was forced by ENABLE_OPENGL_ERROR_LOGGING, only show
-    // OpenGL errors if sufficiently high loglevel.
+#if defined(NDEBUG)
+    // In release mode, only show OpenGL errors if sufficiently high loglevel.
     if (Slic3r::get_logging_level() < 5)
         return;
-#endif // ENABLE_OPENGL_ERROR_LOGGING
+#endif // NDEBUG
 
     GLenum err = glGetError();
     if (err == GL_NO_ERROR)
diff --git a/src/slic3r/GUI/3DScene.hpp b/src/slic3r/GUI/3DScene.hpp
index 6565d5c09..e4d9c6067 100644
--- a/src/slic3r/GUI/3DScene.hpp
+++ b/src/slic3r/GUI/3DScene.hpp
@@ -10,10 +10,7 @@
 
 #include <functional>
 
-#if ENABLE_OPENGL_ERROR_LOGGING || ! defined(NDEBUG)
-    #define HAS_GLSAFE
-#endif
-
+#define HAS_GLSAFE
 #ifdef HAS_GLSAFE
     extern void glAssertRecentCallImpl(const char *file_name, unsigned int line, const char *function_name);
     inline void glAssertRecentCall() { glAssertRecentCallImpl(__FILE__, __LINE__, __FUNCTION__); }
diff --git a/src/slic3r/GUI/ConfigWizard.cpp b/src/slic3r/GUI/ConfigWizard.cpp
index 59908bd80..bd6986d3e 100644
--- a/src/slic3r/GUI/ConfigWizard.cpp
+++ b/src/slic3r/GUI/ConfigWizard.cpp
@@ -629,13 +629,13 @@ PageMaterials::PageMaterials(ConfigWizard *parent, Materials *materials, wxStrin
     append(html_window, 0, wxEXPAND);
 
 	list_printer->Bind(wxEVT_LISTBOX, [this](wxCommandEvent& evt) {
-		update_lists(evt.GetInt(), list_type->GetSelection(), list_vendor->GetSelection());
+		update_lists(list_type->GetSelection(), list_vendor->GetSelection(), evt.GetInt());
 		});
     list_type->Bind(wxEVT_LISTBOX, [this](wxCommandEvent &) {
-        update_lists(list_printer->GetSelection(), list_type->GetSelection(), list_vendor->GetSelection());
+        update_lists(list_type->GetSelection(), list_vendor->GetSelection());
     });
     list_vendor->Bind(wxEVT_LISTBOX, [this](wxCommandEvent &) {
-        update_lists(list_printer->GetSelection(), list_type->GetSelection(), list_vendor->GetSelection());
+        update_lists(list_type->GetSelection(), list_vendor->GetSelection());
     });
 
     list_profile->Bind(wxEVT_CHECKLISTBOX, [this](wxCommandEvent &evt) { select_material(evt.GetInt()); });
@@ -681,8 +681,7 @@ void PageMaterials::reload_presets()
     sort_list_data(list_printer, true, false);
     if (list_printer->GetCount() > 0) {
         list_printer->SetSelection(0);
-		sel_printer_count_prev = wxNOT_FOUND;
-        sel_printer_item_prev = wxNOT_FOUND;
+        sel_printers_prev.Clear();
         sel_type_prev = wxNOT_FOUND;
         sel_vendor_prev = wxNOT_FOUND;
         update_lists(0, 0, 0);
@@ -812,7 +811,7 @@ void PageMaterials::on_material_highlighted(int sel_material)
     set_compatible_printers_html_window(names, names.size() == materials->printers.size());
 }
 
-void PageMaterials::update_lists(int sel_printer, int sel_type, int sel_vendor)
+void PageMaterials::update_lists(int sel_type, int sel_vendor, int last_selected_printer/* = -1*/)
 {
 	wxWindowUpdateLocker freeze_guard(this);
 	(void)freeze_guard;
@@ -820,7 +819,22 @@ void PageMaterials::update_lists(int sel_printer, int sel_type, int sel_vendor)
 	wxArrayInt sel_printers;
 	int sel_printers_count = list_printer->GetSelections(sel_printers);
 
-	if (sel_printers_count != sel_printer_count_prev || (sel_printers_count == 1 && sel_printer_item_prev != sel_printer && sel_printer != -1)) {
+    // Does our wxWidgets version support operator== for wxArrayInt ?
+    // https://github.com/prusa3d/PrusaSlicer/issues/5152#issuecomment-787208614
+#if wxCHECK_VERSION(3, 1, 1)
+    if (sel_printers != sel_printers_prev) {
+#else
+    auto are_equal = [](const wxArrayInt& arr_first, const wxArrayInt& arr_second) {
+        if (arr_first.GetCount() != arr_second.GetCount())
+            return false;
+        for (size_t i = 0; i < arr_first.GetCount(); i++)
+            if (arr_first[i] != arr_second[i])
+                return false;
+        return true;
+    };
+    if (!are_equal(sel_printers, sel_printers_prev)) {
+#endif
+
         // Refresh type list
 		list_type->Clear();
 		list_type->append(_L("(All)"), &EMPTY);
@@ -828,7 +842,7 @@ void PageMaterials::update_lists(int sel_printer, int sel_type, int sel_vendor)
             // If all is selected with other printers
             // unselect "all" or all printers depending on last value
             if (sel_printers[0] == 0 && sel_printers_count > 1) {
-                if (sel_printer == 0) {
+                if (last_selected_printer == 0) {
                     list_printer->SetSelection(wxNOT_FOUND);
                     list_printer->SetSelection(0);
                 } else {
@@ -869,8 +883,7 @@ void PageMaterials::update_lists(int sel_printer, int sel_type, int sel_vendor)
             sort_list_data(list_type, true, true);
 		}
 
-		sel_printer_count_prev = sel_printers_count;
-        sel_printer_item_prev = sel_printer;
+		sel_printers_prev = sel_printers;
 		sel_type = 0;
 		sel_type_prev = wxNOT_FOUND;
 		list_type->SetSelection(sel_type);
@@ -1089,8 +1102,7 @@ void PageMaterials::clear()
     list_type->Clear();
     list_vendor->Clear();
     list_profile->Clear();
-	sel_printer_count_prev = wxNOT_FOUND;
-    sel_printer_item_prev = wxNOT_FOUND;
+	sel_printers_prev.Clear();
     sel_type_prev = wxNOT_FOUND;
     sel_vendor_prev = wxNOT_FOUND;
     presets_loaded = false;
@@ -1189,7 +1201,6 @@ PageReloadFromDisk::PageReloadFromDisk(ConfigWizard* parent)
     box_pathnames->Bind(wxEVT_CHECKBOX, [this](wxCommandEvent& event) { this->full_pathnames = event.IsChecked(); });
 }
 
-#if ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 #ifdef _WIN32
 PageFilesAssociation::PageFilesAssociation(ConfigWizard* parent)
     : ConfigWizardPage(parent, _L("Files association"), _L("Files association"))
@@ -1203,7 +1214,6 @@ PageFilesAssociation::PageFilesAssociation(ConfigWizard* parent)
 //    append(cb_gcode);
 }
 #endif // _WIN32
-#endif // ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 
 PageMode::PageMode(ConfigWizard *parent)
     : ConfigWizardPage(parent, _L("View mode"), _L("View mode"))
@@ -1816,11 +1826,9 @@ void ConfigWizard::priv::load_pages()
 
     index->add_page(page_update);
     index->add_page(page_reload_from_disk);
-#if ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 #ifdef _WIN32
     index->add_page(page_files_association);
 #endif // _WIN32
-#endif // ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
     index->add_page(page_mode);
 
     index->go_to(former_active);   // Will restore the active item/page if possible
@@ -2414,7 +2422,6 @@ void ConfigWizard::priv::apply_config(AppConfig *app_config, PresetBundle *prese
     app_config->set("preset_update", page_update->preset_update ? "1" : "0");
     app_config->set("export_sources_full_pathnames", page_reload_from_disk->full_pathnames ? "1" : "0");
 
-#if ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 #ifdef _WIN32
     app_config->set("associate_3mf", page_files_association->associate_3mf() ? "1" : "0");
     app_config->set("associate_stl", page_files_association->associate_stl() ? "1" : "0");
@@ -2432,7 +2439,6 @@ void ConfigWizard::priv::apply_config(AppConfig *app_config, PresetBundle *prese
 //    }
 
 #endif // _WIN32
-#endif // ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 
     page_mode->serialize_mode(app_config);
 
@@ -2597,11 +2603,9 @@ ConfigWizard::ConfigWizard(wxWindow *parent)
     
     p->add_page(p->page_update   = new PageUpdate(this));
     p->add_page(p->page_reload_from_disk = new PageReloadFromDisk(this));
-#if ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 #ifdef _WIN32
     p->add_page(p->page_files_association = new PageFilesAssociation(this));
 #endif // _WIN32
-#endif // ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
     p->add_page(p->page_mode     = new PageMode(this));
     p->add_page(p->page_firmware = new PageFirmware(this));
     p->add_page(p->page_bed      = new PageBedShape(this));
diff --git a/src/slic3r/GUI/ConfigWizard_private.hpp b/src/slic3r/GUI/ConfigWizard_private.hpp
index d9c0e2dc1..eee906ae7 100644
--- a/src/slic3r/GUI/ConfigWizard_private.hpp
+++ b/src/slic3r/GUI/ConfigWizard_private.hpp
@@ -327,7 +327,8 @@ struct PageMaterials: ConfigWizardPage
     Materials *materials;
     StringList *list_printer, *list_type, *list_vendor;
     PresetList *list_profile;
-    int sel_printer_count_prev, sel_printer_item_prev, sel_type_prev, sel_vendor_prev;
+    wxArrayInt sel_printers_prev;
+    int sel_type_prev, sel_vendor_prev;
     bool presets_loaded;
 
     wxFlexGridSizer *grid;
@@ -342,7 +343,7 @@ struct PageMaterials: ConfigWizardPage
     PageMaterials(ConfigWizard *parent, Materials *materials, wxString title, wxString shortname, wxString list1name);
 
     void reload_presets();
-	void update_lists(int sel1, int sel2, int sel3);
+	void update_lists(int sel_type, int sel_vendor, int last_selected_printer = -1);
 	void on_material_highlighted(int sel_material);
     void on_material_hovered(int sel_material);
     void select_material(int i);
@@ -392,7 +393,6 @@ struct PageReloadFromDisk : ConfigWizardPage
     PageReloadFromDisk(ConfigWizard* parent);
 };
 
-#if ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 #ifdef _WIN32
 struct PageFilesAssociation : ConfigWizardPage
 {
@@ -409,7 +409,6 @@ public:
 //    bool associate_gcode() const { return cb_gcode->IsChecked(); }
 };
 #endif // _WIN32
-#endif // ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 
 struct PageMode: ConfigWizardPage
 {
@@ -571,11 +570,9 @@ struct ConfigWizard::priv
     PageCustom       *page_custom = nullptr;
     PageUpdate       *page_update = nullptr;
     PageReloadFromDisk *page_reload_from_disk = nullptr;
-#if ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 #ifdef _WIN32
     PageFilesAssociation* page_files_association = nullptr;
 #endif // _WIN32
-#endif // ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
     PageMode         *page_mode = nullptr;
     PageVendors      *page_vendors = nullptr;
     Pages3rdparty     pages_3rdparty;
diff --git a/src/slic3r/GUI/GCodeViewer.cpp b/src/slic3r/GUI/GCodeViewer.cpp
index ec2bc9797..c8463e2d0 100644
--- a/src/slic3r/GUI/GCodeViewer.cpp
+++ b/src/slic3r/GUI/GCodeViewer.cpp
@@ -183,11 +183,13 @@ void GCodeViewer::TBuffer::add_path(const GCodeProcessor::MoveVertex& move, unsi
     // use rounding to reduce the number of generated paths
 #if ENABLE_SPLITTED_VERTEX_BUFFER
     paths.push_back({ move.type, move.extrusion_role, move.delta_extruder,
-        round_to_nearest(move.height, 2), round_to_nearest(move.width, 2), move.feedrate, move.fan_speed,
+        round_to_nearest(move.height, 2), round_to_nearest(move.width, 2),
+        move.feedrate, move.fan_speed, move.temperature,
         move.volumetric_rate(), move.extruder_id, move.cp_color_id, { { endpoint, endpoint } } });
 #else
     paths.push_back({ move.type, move.extrusion_role, endpoint, endpoint, move.delta_extruder,
-        round_to_nearest(move.height, 2), round_to_nearest(move.width, 2), move.feedrate, move.fan_speed,
+        round_to_nearest(move.height, 2), round_to_nearest(move.width, 2),
+        move.feedrate, move.fan_speed, move.temperature,
         move.volumetric_rate(), move.extruder_id, move.cp_color_id });
 #endif // ENABLE_SPLITTED_VERTEX_BUFFER
 }
@@ -654,6 +656,7 @@ void GCodeViewer::refresh(const GCodeProcessor::Result& gcode_result, const std:
             m_extrusions.ranges.height.update_from(round_to_nearest(curr.height, 2));
             m_extrusions.ranges.width.update_from(round_to_nearest(curr.width, 2));
             m_extrusions.ranges.fan_speed.update_from(curr.fan_speed);
+            m_extrusions.ranges.temperature.update_from(curr.temperature);
             m_extrusions.ranges.volumetric_rate.update_from(round_to_nearest(curr.volumetric_rate(), 2));
             [[fallthrough]];
         }
@@ -2898,6 +2901,7 @@ void GCodeViewer::refresh_render_paths(bool keep_sequential_current_first, bool
         case EViewType::Width:          { color = m_extrusions.ranges.width.get_color_at(path.width); break; }
         case EViewType::Feedrate:       { color = m_extrusions.ranges.feedrate.get_color_at(path.feedrate); break; }
         case EViewType::FanSpeed:       { color = m_extrusions.ranges.fan_speed.get_color_at(path.fan_speed); break; }
+        case EViewType::Temperature:    { color = m_extrusions.ranges.temperature.get_color_at(path.temperature); break; }
         case EViewType::VolumetricRate: { color = m_extrusions.ranges.volumetric_rate.get_color_at(path.volumetric_rate); break; }
         case EViewType::Tool:           { color = m_tool_colors[path.extruder_id]; break; }
         case EViewType::ColorPrint:     {
@@ -3357,6 +3361,7 @@ void GCodeViewer::refresh_render_paths(bool keep_sequential_current_first, bool
         case EViewType::Width:          { color = m_extrusions.ranges.width.get_color_at(path.width); break; }
         case EViewType::Feedrate:       { color = m_extrusions.ranges.feedrate.get_color_at(path.feedrate); break; }
         case EViewType::FanSpeed:       { color = m_extrusions.ranges.fan_speed.get_color_at(path.fan_speed); break; }
+        case EViewType::Temperature:    { color = m_extrusions.ranges.temperature.get_color_at(path.temperature); break; }
         case EViewType::VolumetricRate: { color = m_extrusions.ranges.volumetric_rate.get_color_at(path.volumetric_rate); break; }
         case EViewType::Tool:           { color = m_tool_colors[path.extruder_id]; break; }
         case EViewType::ColorPrint:     {
@@ -4191,6 +4196,7 @@ void GCodeViewer::render_legend() const
     case EViewType::Width:          { imgui.title(_u8L("Width (mm)")); break; }
     case EViewType::Feedrate:       { imgui.title(_u8L("Speed (mm/s)")); break; }
     case EViewType::FanSpeed:       { imgui.title(_u8L("Fan Speed (%)")); break; }
+    case EViewType::Temperature:    { imgui.title(_u8L("Temperature (°C)")); break; }
     case EViewType::VolumetricRate: { imgui.title(_u8L("Volumetric flow rate (mm³/s)")); break; }
     case EViewType::Tool:           { imgui.title(_u8L("Tool")); break; }
     case EViewType::ColorPrint:     { imgui.title(_u8L("Color Print")); break; }
@@ -4225,6 +4231,7 @@ void GCodeViewer::render_legend() const
     case EViewType::Width:          { append_range(m_extrusions.ranges.width, 3); break; }
     case EViewType::Feedrate:       { append_range(m_extrusions.ranges.feedrate, 1); break; }
     case EViewType::FanSpeed:       { append_range(m_extrusions.ranges.fan_speed, 0); break; }
+    case EViewType::Temperature:    { append_range(m_extrusions.ranges.temperature, 0); break; }
     case EViewType::VolumetricRate: { append_range(m_extrusions.ranges.volumetric_rate, 3); break; }
     case EViewType::Tool:
     {
diff --git a/src/slic3r/GUI/GCodeViewer.hpp b/src/slic3r/GUI/GCodeViewer.hpp
index 0302b28bf..ada377d36 100644
--- a/src/slic3r/GUI/GCodeViewer.hpp
+++ b/src/slic3r/GUI/GCodeViewer.hpp
@@ -179,6 +179,7 @@ class GCodeViewer
         float width{ 0.0f };
         float feedrate{ 0.0f };
         float fan_speed{ 0.0f };
+        float temperature{ 0.0f };
         float volumetric_rate{ 0.0f };
         unsigned char extruder_id{ 0 };
         unsigned char cp_color_id{ 0 };
@@ -407,6 +408,8 @@ class GCodeViewer
             Range fan_speed;
             // Color mapping by volumetric extrusion rate.
             Range volumetric_rate;
+            // Color mapping by extrusion temperature.
+            Range temperature;
 
             void reset() {
                 height.reset();
@@ -414,6 +417,7 @@ class GCodeViewer
                 feedrate.reset();
                 fan_speed.reset();
                 volumetric_rate.reset();
+                temperature.reset();
             }
         };
 
@@ -654,6 +658,7 @@ public:
         Width,
         Feedrate,
         FanSpeed,
+        Temperature,
         VolumetricRate,
         Tool,
         ColorPrint,
diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 54c4844be..4931e7362 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -2512,8 +2512,6 @@ void GLCanvas3D::on_char(wxKeyEvent& evt)
 #endif /* __APPLE__ */
             post_event(SimpleEvent(EVT_GLTOOLBAR_COPY));
         break;
-
-#if ENABLE_CTRL_M_ON_WINDOWS
 #ifdef __APPLE__
         case 'm':
         case 'M':
@@ -2532,18 +2530,6 @@ void GLCanvas3D::on_char(wxKeyEvent& evt)
 #endif //_WIN32
             break;
         }
-#else
-#if defined(__linux__) || defined(__APPLE__)
-        case WXK_CONTROL_M:
-        {
-            Mouse3DController& controller = wxGetApp().plater()->get_mouse3d_controller();
-            controller.show_settings_dialog(!controller.is_settings_dialog_shown());
-            m_dirty = true;
-            break;
-        }
-#endif /* __linux__ */
-#endif // ENABLE_CTRL_M_ON_WINDOWS
-
 #ifdef __APPLE__
         case 'v':
         case 'V':
diff --git a/src/slic3r/GUI/GUI_App.cpp b/src/slic3r/GUI/GUI_App.cpp
index 90e178090..2fde30cd1 100644
--- a/src/slic3r/GUI/GUI_App.cpp
+++ b/src/slic3r/GUI/GUI_App.cpp
@@ -835,14 +835,10 @@ bool GUI_App::on_init_inner()
 
     if (is_editor()) {
 #ifdef __WXMSW__ 
-#if ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
         if (app_config->get("associate_3mf") == "1")
-#endif // ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
             associate_3mf_files();
-#if ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
         if (app_config->get("associate_stl") == "1")
             associate_stl_files();
-#endif // ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 #endif // __WXMSW__
 
         preset_updater = new PresetUpdater();
@@ -858,9 +854,7 @@ bool GUI_App::on_init_inner()
     }
     else {
 #ifdef __WXMSW__ 
-#if ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
         if (app_config->get("associate_gcode") == "1")
-#endif // ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
             associate_gcode_files();
 #endif // __WXMSW__
     }
@@ -1722,7 +1716,6 @@ void GUI_App::add_config_menu(wxMenuBar *menu)
                 if (dlg.seq_top_layer_only_changed())
 #endif // ENABLE_GCODE_LINES_ID_IN_H_SLIDER
                     this->plater_->refresh_print();
-#if ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 #ifdef _WIN32
                 if (is_editor()) {
                     if (app_config->get("associate_3mf") == "1")
@@ -1735,7 +1728,6 @@ void GUI_App::add_config_menu(wxMenuBar *menu)
                         associate_gcode_files();
                 }
 #endif // _WIN32
-#endif // ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
             }
             if (app_layout_changed) {
                 // hide full main_sizer for mainFrame
@@ -2303,7 +2295,6 @@ void GUI_App::associate_3mf_files()
         ::SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_IDLIST, nullptr, nullptr);
 }
 
-#if ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 void GUI_App::associate_stl_files()
 {
     wchar_t app_path[MAX_PATH];
@@ -2327,7 +2318,6 @@ void GUI_App::associate_stl_files()
         // notify Windows only when any of the values gets changed
         ::SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_IDLIST, nullptr, nullptr);
 }
-#endif // ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 
 void GUI_App::associate_gcode_files()
 {
diff --git a/src/slic3r/GUI/GUI_App.hpp b/src/slic3r/GUI/GUI_App.hpp
index 132776dcb..5572c5071 100644
--- a/src/slic3r/GUI/GUI_App.hpp
+++ b/src/slic3r/GUI/GUI_App.hpp
@@ -279,13 +279,11 @@ public:
     bool is_gl_version_greater_or_equal_to(unsigned int major, unsigned int minor) const { return m_opengl_mgr.get_gl_info().is_version_greater_or_equal_to(major, minor); }
     bool is_glsl_version_greater_or_equal_to(unsigned int major, unsigned int minor) const { return m_opengl_mgr.get_gl_info().is_glsl_version_greater_or_equal_to(major, minor); }
 
-#if ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 #ifdef __WXMSW__
     void            associate_3mf_files();
     void            associate_stl_files();
     void            associate_gcode_files();
 #endif // __WXMSW__
-#endif // ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 
 private:
     bool            on_init_inner();
@@ -297,13 +295,6 @@ private:
 
     bool            config_wizard_startup();
 	void            check_updates(const bool verbose);
-
-#if !ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
-#ifdef __WXMSW__
-    void            associate_3mf_files();
-    void            associate_gcode_files();
-#endif // __WXMSW__
-#endif // !ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 };
 
 DECLARE_APP(GUI_App)
diff --git a/src/slic3r/GUI/GUI_ObjectList.cpp b/src/slic3r/GUI/GUI_ObjectList.cpp
index 5247558c7..ad5ee151d 100644
--- a/src/slic3r/GUI/GUI_ObjectList.cpp
+++ b/src/slic3r/GUI/GUI_ObjectList.cpp
@@ -93,6 +93,7 @@ ObjectList::ObjectList(wxWindow* parent) :
         CATEGORY_ICON[L("Layers and Perimeters")]    = create_scaled_bitmap("layers");
         CATEGORY_ICON[L("Infill")]                   = create_scaled_bitmap("infill");
         CATEGORY_ICON[L("Ironing")]                  = create_scaled_bitmap("ironing");
+        CATEGORY_ICON[L("Fuzzy Skin")]               = create_scaled_bitmap("fuzzy_skin");
         CATEGORY_ICON[L("Support material")]         = create_scaled_bitmap("support");
         CATEGORY_ICON[L("Speed")]                    = create_scaled_bitmap("time");
         CATEGORY_ICON[L("Extruders")]                = create_scaled_bitmap("funnel");
diff --git a/src/slic3r/GUI/GUI_Preview.cpp b/src/slic3r/GUI/GUI_Preview.cpp
index 76677660d..2f11d66f5 100644
--- a/src/slic3r/GUI/GUI_Preview.cpp
+++ b/src/slic3r/GUI/GUI_Preview.cpp
@@ -211,6 +211,7 @@ bool Preview::init(wxWindow* parent, Model* model)
     m_choice_view_type->Append(_L("Width"));
     m_choice_view_type->Append(_L("Speed"));
     m_choice_view_type->Append(_L("Fan speed"));
+    m_choice_view_type->Append(_L("Temperature"));
     m_choice_view_type->Append(_L("Volumetric flow rate"));
     m_choice_view_type->Append(_L("Tool"));
     m_choice_view_type->Append(_L("Color Print"));
diff --git a/src/slic3r/GUI/GUI_Utils.hpp b/src/slic3r/GUI/GUI_Utils.hpp
index dbb200f83..4f02c6c23 100644
--- a/src/slic3r/GUI/GUI_Utils.hpp
+++ b/src/slic3r/GUI/GUI_Utils.hpp
@@ -26,11 +26,7 @@ class wxCheckBox;
 class wxTopLevelWindow;
 class wxRect;
 
-#if ENABLE_WX_3_1_3_DPI_CHANGED_EVENT
 #define wxVERSION_EQUAL_OR_GREATER_THAN(major, minor, release) ((wxMAJOR_VERSION > major) || ((wxMAJOR_VERSION == major) && (wxMINOR_VERSION > minor)) || ((wxMAJOR_VERSION == major) && (wxMINOR_VERSION == minor) && (wxRELEASE_NUMBER >= release)))
-#else
-#define wxVERSION_EQUAL_OR_GREATER_THAN(major, minor, release) 0
-#endif // ENABLE_WX_3_1_3_DPI_CHANGED_EVENT
 
 namespace Slic3r {
 namespace GUI {
@@ -99,12 +95,12 @@ public:
 
         // Linux specific issue : get_dpi_for_window(this) still doesn't responce to the Display's scale in new wxWidgets(3.1.3).
         // So, calculate the m_em_unit value from the font size, as before
-#if ENABLE_WX_3_1_3_DPI_CHANGED_EVENT && !defined(__WXGTK__)
+#if !defined(__WXGTK__)
         m_em_unit = std::max<size_t>(10, 10.0f * m_scale_factor);
 #else
         // initialize default width_unit according to the width of the one symbol ("m") of the currently active font of this window.
         m_em_unit = std::max<size_t>(10, this->GetTextExtent("m").x - 1);
-#endif // ENABLE_WX_3_1_3_DPI_CHANGED_EVENT
+#endif // __WXGTK__
 
 //        recalc_font();
 
@@ -235,11 +231,7 @@ private:
         m_normal_font = this->GetFont();
 
         // update em_unit value for new window font
-#if ENABLE_WX_3_1_3_DPI_CHANGED_EVENT
         m_em_unit = std::max<int>(10, 10.0f * m_scale_factor);
-#else
-        m_em_unit = std::max<size_t>(10, this->GetTextExtent("m").x - 1);
-#endif // ENABLE_WX_3_1_3_DPI_CHANGED_EVENT
 
         // rescale missed controls sizes and images
         on_dpi_changed(suggested_rect);
diff --git a/src/slic3r/GUI/KBShortcutsDialog.cpp b/src/slic3r/GUI/KBShortcutsDialog.cpp
index c1efa324e..1c451672c 100644
--- a/src/slic3r/GUI/KBShortcutsDialog.cpp
+++ b/src/slic3r/GUI/KBShortcutsDialog.cpp
@@ -147,17 +147,11 @@ void KBShortcutsDialog::fill_shortcuts()
             { "O", L("Zoom out") },
             { "Tab", L("Switch between Editor/Preview") },
             { "Shift+Tab", L("Collapse/Expand the sidebar") },
-#if ENABLE_CTRL_M_ON_WINDOWS
 #ifdef _WIN32
             { ctrl + "M", L("Show/Hide 3Dconnexion devices settings dialog, if enabled") },
 #else
             { ctrl + "M", L("Show/Hide 3Dconnexion devices settings dialog") },
 #endif // _WIN32
-#else
-#if defined(__linux__) || defined(__APPLE__)
-            { ctrl + "M", L("Show/Hide 3Dconnexion devices settings dialog") },
-#endif // __linux__
-#endif // ENABLE_CTRL_M_ON_WINDOWS
 #if ENABLE_RENDER_PICKING_PASS
             // Don't localize debugging texts.
             { "P", "Toggle picking pass texture rendering on/off" },
diff --git a/src/slic3r/GUI/MainFrame.cpp b/src/slic3r/GUI/MainFrame.cpp
index 386a150f7..c1aadb370 100644
--- a/src/slic3r/GUI/MainFrame.cpp
+++ b/src/slic3r/GUI/MainFrame.cpp
@@ -549,9 +549,10 @@ void MainFrame::init_tabpanel()
         wxWindow* panel = m_tabpanel->GetCurrentPage();
         if (panel != nullptr) {
             Tab* tab = dynamic_cast<Tab*>(panel);
-            if (tab && (tab->type() == Preset::TYPE_FILAMENT || tab->type() == Preset::TYPE_PRINTER))
-                if (!tab->validate_custom_gcodes())
-                    evt.Veto();
+            if (tab != nullptr)
+                tab->validate_custom_gcodes();
+//            if (tab != nullptr && !tab->validate_custom_gcodes())
+//                evt.Veto();
         }
         });
 #endif // ENABLE_VALIDATE_CUSTOM_GCODE
@@ -803,11 +804,7 @@ bool MainFrame::can_reslice() const
 
 void MainFrame::on_dpi_changed(const wxRect& suggested_rect)
 {
-#if ENABLE_WX_3_1_3_DPI_CHANGED_EVENT
     wxGetApp().update_fonts(this);
-#else
-    wxGetApp().update_fonts();
-#endif // ENABLE_WX_3_1_3_DPI_CHANGED_EVENT
     this->SetFont(this->normal_font());
 
     // update Plater
@@ -1848,14 +1845,14 @@ SettingsDialog::SettingsDialog(MainFrame* mainframe)
     if (wxGetApp().is_gcode_viewer())
         return;
 
-#if ENABLE_WX_3_1_3_DPI_CHANGED_EVENT && defined(__WXMSW__)
+#if defined(__WXMSW__)
     // ys_FIXME! temporary workaround for correct font scaling
     // Because of from wxWidgets 3.1.3 auto rescaling is implemented for the Fonts,
     // From the very beginning set dialog font to the wxSYS_DEFAULT_GUI_FONT
     this->SetFont(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
 #else
     this->SetFont(wxGetApp().normal_font());
-#endif // ENABLE_WX_3_1_3_DPI_CHANGED_EVENT
+#endif // __WXMSW__
     this->SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
 
     // Load the icon either from the exe, or from the ico file.
diff --git a/src/slic3r/GUI/Mouse3DController.cpp b/src/slic3r/GUI/Mouse3DController.cpp
index 9ff5688be..57b82fc78 100644
--- a/src/slic3r/GUI/Mouse3DController.cpp
+++ b/src/slic3r/GUI/Mouse3DController.cpp
@@ -100,7 +100,6 @@ void Mouse3DController::State::append_button(unsigned int id, size_t /* input_qu
 }
 
 #ifdef _WIN32
-#if ENABLE_CTRL_M_ON_WINDOWS
 static std::string format_device_string(int vid, int pid)
 {
     std::string ret;
@@ -257,7 +256,6 @@ static std::string detect_attached_device()
 
     return ret;
 }
-#endif // ENABLE_CTRL_M_ON_WINDOWS
 
 // Called by Win32 HID enumeration callback.
 void Mouse3DController::device_attached(const std::string &device)
@@ -274,7 +272,6 @@ void Mouse3DController::device_attached(const std::string &device)
 			// Never mind, enumeration will be performed until connected.
 		    m_wakeup = true;
 			m_stop_condition.notify_all();
-#if ENABLE_CTRL_M_ON_WINDOWS
             m_device_str = format_device_string(vid, pid);
             if (auto it_params = m_params_by_device.find(m_device_str); it_params != m_params_by_device.end()) {
                 tbb::mutex::scoped_lock lock(m_params_ui_mutex);
@@ -283,12 +280,10 @@ void Mouse3DController::device_attached(const std::string &device)
             else
                 m_params_by_device[format_device_string(vid, pid)] = Params();
             m_connected = true;
-#endif // ENABLE_CTRL_M_ON_WINDOWS
         }
 	}
 }
 
-#if ENABLE_CTRL_M_ON_WINDOWS
 void Mouse3DController::device_detached(const std::string& device)
 {
     int vid = 0;
@@ -302,7 +297,6 @@ void Mouse3DController::device_detached(const std::string& device)
     m_device_str = "";
     m_connected = false;
 }
-#endif // ENABLE_CTRL_M_ON_WINDOWS
 
 // Filter out mouse scroll events produced by the 3DConnexion driver.
 bool Mouse3DController::State::process_mouse_wheel()
@@ -415,7 +409,6 @@ bool Mouse3DController::apply(Camera& camera)
         m_settings_dialog_closed_by_user = false;
     }
 
-#if ENABLE_CTRL_M_ON_WINDOWS
 #ifdef _WIN32
     {
         tbb::mutex::scoped_lock lock(m_params_ui_mutex);
@@ -425,7 +418,6 @@ bool Mouse3DController::apply(Camera& camera)
         }
     }
 #endif // _WIN32
-#endif // ENABLE_CTRL_M_ON_WINDOWS
 
     return m_state.apply(m_params, camera);
 }
@@ -661,7 +653,6 @@ bool Mouse3DController::handle_input(const DataPacketAxis& packet)
 // Initialize the application.
 void Mouse3DController::init()
 {
-#if ENABLE_CTRL_M_ON_WINDOWS
 #ifdef _WIN32
     m_device_str = detect_attached_device();
     if (!m_device_str.empty()) {
@@ -670,7 +661,6 @@ void Mouse3DController::init()
             m_params = m_params_ui = it_params->second;
     }
 #endif // _WIN32
-#endif // ENABLE_CTRL_M_ON_WINDOWS
 
 	assert(! m_thread.joinable());
     if (! m_thread.joinable()) {
@@ -698,12 +688,10 @@ void Mouse3DController::shutdown()
         m_stop = false;
 	}
 
-#if ENABLE_CTRL_M_ON_WINDOWS
 #ifdef _WIN32
     if (!m_device_str.empty())
         m_params_by_device[m_device_str] = m_params_ui;
 #endif // _WIN32
-#endif // ENABLE_CTRL_M_ON_WINDOWS
 }
 
 // Main routine of the worker thread.
@@ -1064,9 +1052,7 @@ bool Mouse3DController::handle_raw_input_win32(const unsigned char *data, const
         DataPacketRaw packet;
     	memcpy(packet.data(), data, packet_length);
         handle_packet(packet, packet_length, m_params, m_state);
-#if ENABLE_CTRL_M_ON_WINDOWS
         m_connected = true;
-#endif // ENABLE_CTRL_M_ON_WINDOWS
     }
 
     return true;
diff --git a/src/slic3r/GUI/Mouse3DController.hpp b/src/slic3r/GUI/Mouse3DController.hpp
index af131992c..3376ef814 100644
--- a/src/slic3r/GUI/Mouse3DController.hpp
+++ b/src/slic3r/GUI/Mouse3DController.hpp
@@ -195,9 +195,7 @@ public:
 
     // Called by Win32 HID enumeration callback.
     void device_attached(const std::string &device);
-#if ENABLE_CTRL_M_ON_WINDOWS
     void device_detached(const std::string& device);
-#endif // ENABLE_CTRL_M_ON_WINDOWS
 
     // On Windows, the 3DConnexion driver sends out mouse wheel rotation events to an active application
     // if the application does not register at the driver. This is a workaround to ignore these superfluous
diff --git a/src/slic3r/GUI/OpenGLManager.cpp b/src/slic3r/GUI/OpenGLManager.cpp
index 4f1e00793..0fa97bfc1 100644
--- a/src/slic3r/GUI/OpenGLManager.cpp
+++ b/src/slic3r/GUI/OpenGLManager.cpp
@@ -14,14 +14,10 @@
 #include <wx/glcanvas.h>
 #include <wx/msgdlg.h>
 
-#if ENABLE_HACK_CLOSING_ON_OSX_10_9_5
 #ifdef __APPLE__
 // Part of hack to remove crash when closing the application on OSX 10.9.5 when building against newer wxWidgets
 #include <wx/platinfo.h>
-#endif // __APPLE__
-#endif // ENABLE_HACK_CLOSING_ON_OSX_10_9_5
 
-#ifdef __APPLE__
 #include "../Utils/MacDarkMode.hpp"
 #endif // __APPLE__
 
@@ -202,34 +198,26 @@ bool OpenGLManager::s_compressed_textures_supported = false;
 OpenGLManager::EMultisampleState OpenGLManager::s_multisample = OpenGLManager::EMultisampleState::Unknown;
 OpenGLManager::EFramebufferType OpenGLManager::s_framebuffers_type = OpenGLManager::EFramebufferType::Unknown;
 
-#if ENABLE_HACK_CLOSING_ON_OSX_10_9_5
 #ifdef __APPLE__ 
 // Part of hack to remove crash when closing the application on OSX 10.9.5 when building against newer wxWidgets
 OpenGLManager::OSInfo OpenGLManager::s_os_info;
 #endif // __APPLE__ 
-#endif // ENABLE_HACK_CLOSING_ON_OSX_10_9_5
 
 OpenGLManager::~OpenGLManager()
 {
     m_shaders_manager.shutdown();
 
-#if ENABLE_HACK_CLOSING_ON_OSX_10_9_5
 #ifdef __APPLE__ 
     // This is an ugly hack needed to solve the crash happening when closing the application on OSX 10.9.5 with newer wxWidgets
     // The crash is triggered inside wxGLContext destructor
     if (s_os_info.major != 10 || s_os_info.minor != 9 || s_os_info.micro != 5)
     {
 #endif //__APPLE__
-#endif // ENABLE_HACK_CLOSING_ON_OSX_10_9_5
-
         if (m_context != nullptr)
             delete m_context;
-
-#if ENABLE_HACK_CLOSING_ON_OSX_10_9_5
 #ifdef __APPLE__ 
     }
 #endif //__APPLE__
-#endif // ENABLE_HACK_CLOSING_ON_OSX_10_9_5
 }
 
 bool OpenGLManager::init_gl()
@@ -286,14 +274,12 @@ wxGLContext* OpenGLManager::init_glcontext(wxGLCanvas& canvas)
     if (m_context == nullptr) {
         m_context = new wxGLContext(&canvas);
 
-#if ENABLE_HACK_CLOSING_ON_OSX_10_9_5
 #ifdef __APPLE__ 
         // Part of hack to remove crash when closing the application on OSX 10.9.5 when building against newer wxWidgets
         s_os_info.major = wxPlatformInfo::Get().GetOSMajorVersion();
         s_os_info.minor = wxPlatformInfo::Get().GetOSMinorVersion();
         s_os_info.micro = wxPlatformInfo::Get().GetOSMicroVersion();
 #endif //__APPLE__
-#endif // ENABLE_HACK_CLOSING_ON_OSX_10_9_5
     }
     return m_context;
 }
diff --git a/src/slic3r/GUI/OpenGLManager.hpp b/src/slic3r/GUI/OpenGLManager.hpp
index c89cdf3a6..5f8cd7959 100644
--- a/src/slic3r/GUI/OpenGLManager.hpp
+++ b/src/slic3r/GUI/OpenGLManager.hpp
@@ -51,7 +51,6 @@ public:
         void detect() const;
     };
 
-#if ENABLE_HACK_CLOSING_ON_OSX_10_9_5
 #ifdef __APPLE__ 
     // Part of hack to remove crash when closing the application on OSX 10.9.5 when building against newer wxWidgets
     struct OSInfo
@@ -61,7 +60,6 @@ public:
         int micro{ 0 };
     };
 #endif //__APPLE__
-#endif // ENABLE_HACK_CLOSING_ON_OSX_10_9_5
 
 private:
     enum class EMultisampleState : unsigned char
@@ -75,12 +73,10 @@ private:
     wxGLContext* m_context{ nullptr };
     GLShadersManager m_shaders_manager;
     static GLInfo s_gl_info;
-#if ENABLE_HACK_CLOSING_ON_OSX_10_9_5
 #ifdef __APPLE__ 
     // Part of hack to remove crash when closing the application on OSX 10.9.5 when building against newer wxWidgets
     static OSInfo s_os_info;
 #endif //__APPLE__
-#endif // ENABLE_HACK_CLOSING_ON_OSX_10_9_5
     static bool s_compressed_textures_supported;
     static EMultisampleState s_multisample;
     static EFramebufferType s_framebuffers_type;
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index b23d81174..1578890f4 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -1931,11 +1931,9 @@ Plater::priv::priv(Plater *q, MainFrame *main_frame)
     this->q->Bind(EVT_HID_DEVICE_ATTACHED, [this](HIDDeviceAttachedEvent &evt) {
     	mouse3d_controller.device_attached(evt.data);
         });
-#if ENABLE_CTRL_M_ON_WINDOWS
     this->q->Bind(EVT_HID_DEVICE_DETACHED, [this](HIDDeviceAttachedEvent& evt) {
         mouse3d_controller.device_detached(evt.data);
         });
-#endif // ENABLE_CTRL_M_ON_WINDOWS
 #endif /* _WIN32 */
 
 	notification_manager = new NotificationManager(this->q);
@@ -2191,9 +2189,56 @@ 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));
+                        PresetBundle* preset_bundle = wxGetApp().preset_bundle;
+                        preset_bundle->load_config_model(filename.string(), std::move(config));
+                        {
+                            // After loading of the presets from project, check if they are visible.
+                            // Set them to visible if they are not.
+
+                            auto update_selected_preset_visibility = [](PresetCollection& presets, std::vector<std::string>& names) {
+                                if (!presets.get_selected_preset().is_visible) {
+                                    assert(presets.get_selected_preset().name == presets.get_edited_preset().name);
+                                    presets.get_selected_preset().is_visible = true;
+                                    presets.get_edited_preset().is_visible = true;
+                                    names.emplace_back(presets.get_selected_preset().name);
+                                }
+                            };
+
+                            std::vector<std::string> names;
+                            if (printer_technology == ptFFF) {
+                                update_selected_preset_visibility(preset_bundle->prints, names);
+                                for (const std::string& filament : preset_bundle->filament_presets) {
+                                    Preset* preset = preset_bundle->filaments.find_preset(filament);
+                                    if (preset && !preset->is_visible) {
+                                        preset->is_visible = true;
+                                        names.emplace_back(preset->name);
+                                        if (preset->name == preset_bundle->filaments.get_edited_preset().name)
+                                            preset_bundle->filaments.get_selected_preset().is_visible = true;
+                                    }
+                                }
+                            }
+                            else {
+                                update_selected_preset_visibility(preset_bundle->sla_prints, names);
+                                update_selected_preset_visibility(preset_bundle->sla_materials, names);
+                            }
+                            update_selected_preset_visibility(preset_bundle->printers, names);
+
+                            preset_bundle->update_compatible(PresetSelectCompatibleType::Never);
+
+                            // show notification about temporary instaled presets
+                            if (!names.empty()) {
+                                std::string notif_text = into_u8(_L_PLURAL("The preset below was temporary instaled on active instance of PrusaSlicer",
+                                                                           "The presets below were temporary instaled on active instance of PrusaSlicer", names.size())) + ":";
+                                for (std::string& name : names)
+                                    notif_text += "\n - " + name;
+                                notification_manager->push_notification(NotificationType::CustomNotification,
+                                    NotificationManager::NotificationLevel::RegularNotification, notif_text);
+                            }
+                        }
+
                         if (printer_technology == ptFFF)
-                            CustomGCode::update_custom_gcode_per_print_z_from_config(model.custom_gcode_per_print_z, &wxGetApp().preset_bundle->project_config);
+                            CustomGCode::update_custom_gcode_per_print_z_from_config(model.custom_gcode_per_print_z, &preset_bundle->project_config);
+
                         // For exporting from the amf/3mf we shouldn't check printer_presets for the containing information about "Print Host upload"
                         wxGetApp().load_current_presets(false);
                         // Update filament colors for the MM-printer profile in the full config 
@@ -3346,16 +3391,14 @@ void Plater::priv::set_current_panel(wxPanel* panel)
 
 void Plater::priv::on_select_preset(wxCommandEvent &evt)
 {
-    auto preset_type = static_cast<Preset::Type>(evt.GetInt());
-    auto *combo = static_cast<PlaterPresetComboBox*>(evt.GetEventObject());
+    PlaterPresetComboBox* combo = static_cast<PlaterPresetComboBox*>(evt.GetEventObject());
+    Preset::Type preset_type    = combo->get_type();
 
     // see https://github.com/prusa3d/PrusaSlicer/issues/3889
     // Under OSX: in case of use of a same names written in different case (like "ENDER" and "Ender"),
     // m_presets_choice->GetSelection() will return first item, because search in PopupListCtrl is case-insensitive.
     // So, use GetSelection() from event parameter 
-    // But in this function we couldn't use evt.GetSelection(), because m_commandInt is used for preset_type
-    // Thus, get selection in this way:
-    int selection = combo->FindString(evt.GetString(), true);
+    int selection = evt.GetSelection();
 
     auto idx = combo->get_extruder_idx();
 
diff --git a/src/slic3r/GUI/Preferences.cpp b/src/slic3r/GUI/Preferences.cpp
index cba941a39..67381cf22 100644
--- a/src/slic3r/GUI/Preferences.cpp
+++ b/src/slic3r/GUI/Preferences.cpp
@@ -106,7 +106,6 @@ void PreferencesDialog::build()
 		option = Option(def, "export_sources_full_pathnames");
 		m_optgroup_general->append_single_option_line(option);
 
-#if ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 #ifdef _WIN32
 		// Please keep in sync with ConfigWizard
 		def.label = L("Associate .3mf files to PrusaSlicer");
@@ -123,7 +122,6 @@ void PreferencesDialog::build()
 		option = Option(def, "associate_stl");
 		m_optgroup_general->append_single_option_line(option);
 #endif // _WIN32
-#endif // ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 
 		// Please keep in sync with ConfigWizard
 		def.label = L("Update built-in Presets automatically");
@@ -184,7 +182,6 @@ void PreferencesDialog::build()
 		option = Option(def, "default_action_on_select_preset");
 		m_optgroup_general->append_single_option_line(option);
 	}
-#if ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 #ifdef _WIN32
 	else {
 		def.label = L("Associate .gcode files to PrusaSlicer G-code Viewer");
@@ -195,7 +192,6 @@ void PreferencesDialog::build()
 		m_optgroup_general->append_single_option_line(option);
 	}
 #endif // _WIN32
-#endif // ENABLE_CUSTOMIZABLE_FILES_ASSOCIATION_ON_WIN
 
 #if __APPLE__
 	def.label = L("Use Retina resolution for the 3D scene");
@@ -215,7 +211,6 @@ void PreferencesDialog::build()
 	option = Option(def, "show_splash_screen");
 	m_optgroup_general->append_single_option_line(option);
 
-#if ENABLE_CTRL_M_ON_WINDOWS
 #if defined(_WIN32) || defined(__APPLE__)
 	def.label = L("Enable support for legacy 3DConnexion devices");
 	def.type = coBool;
@@ -224,7 +219,6 @@ void PreferencesDialog::build()
 	option = Option(def, "use_legacy_3DConnexion");
 	m_optgroup_general->append_single_option_line(option);
 #endif // _WIN32 || __APPLE__
-#endif // ENABLE_CTRL_M_ON_WINDOWS
 
 	activate_options_tab(m_optgroup_general);
 
diff --git a/src/slic3r/GUI/PresetComboBoxes.cpp b/src/slic3r/GUI/PresetComboBoxes.cpp
index 0754df571..c6a3006b7 100644
--- a/src/slic3r/GUI/PresetComboBoxes.cpp
+++ b/src/slic3r/GUI/PresetComboBoxes.cpp
@@ -121,23 +121,26 @@ PresetComboBox::PresetComboBox(wxWindow* parent, Preset::Type preset_type, const
     Bind(wxEVT_COMBOBOX_DROPDOWN, [this](wxCommandEvent&) { m_suppress_change = false; });
     Bind(wxEVT_COMBOBOX_CLOSEUP,  [this](wxCommandEvent&) { m_suppress_change = true;  });
 
-    Bind(wxEVT_COMBOBOX, [this](wxCommandEvent& evt) {
-        // see https://github.com/prusa3d/PrusaSlicer/issues/3889
-        // Under OSX: in case of use of a same names written in different case (like "ENDER" and "Ender")
-        // m_presets_choice->GetSelection() will return first item, because search in PopupListCtrl is case-insensitive.
-        // So, use GetSelection() from event parameter 
-        auto selected_item = evt.GetSelection();
+    Bind(wxEVT_COMBOBOX, &PresetComboBox::OnSelect, this);
+}
 
-        auto marker = reinterpret_cast<Marker>(this->GetClientData(selected_item));
-        if (marker >= LABEL_ITEM_DISABLED && marker < LABEL_ITEM_MAX)
-            this->SetSelection(this->m_last_selected);
-        else if (on_selection_changed && (m_last_selected != selected_item || m_collection->current_is_dirty())) {
-            m_last_selected = selected_item;
-            on_selection_changed(selected_item);
-            evt.StopPropagation();
-        }
-        evt.Skip();
-    });
+void PresetComboBox::OnSelect(wxCommandEvent& evt)
+{
+    // see https://github.com/prusa3d/PrusaSlicer/issues/3889
+    // Under OSX: in case of use of a same names written in different case (like "ENDER" and "Ender")
+    // m_presets_choice->GetSelection() will return first item, because search in PopupListCtrl is case-insensitive.
+    // So, use GetSelection() from event parameter 
+    auto selected_item = evt.GetSelection();
+
+    auto marker = reinterpret_cast<Marker>(this->GetClientData(selected_item));
+    if (marker >= LABEL_ITEM_DISABLED && marker < LABEL_ITEM_MAX)
+        this->SetSelection(this->m_last_selected);
+    else if (on_selection_changed && (m_last_selected != selected_item || m_collection->current_is_dirty())) {
+        m_last_selected = selected_item;
+        on_selection_changed(selected_item);
+        evt.StopPropagation();
+    }
+    evt.Skip();
 }
 
 PresetComboBox::~PresetComboBox()
@@ -602,34 +605,6 @@ void PresetComboBox::OnDrawItem(wxDC& dc,
 PlaterPresetComboBox::PlaterPresetComboBox(wxWindow *parent, Preset::Type preset_type) :
     PresetComboBox(parent, preset_type, wxSize(15 * wxGetApp().em_unit(), -1))
 {
-    Bind(wxEVT_COMBOBOX, [this](wxCommandEvent &evt) {
-        auto selected_item = evt.GetSelection();
-
-        auto marker = reinterpret_cast<Marker>(this->GetClientData(selected_item));
-        if (marker >= LABEL_ITEM_MARKER && marker < LABEL_ITEM_MAX) {
-            this->SetSelection(this->m_last_selected);
-            evt.StopPropagation();
-            if (marker == LABEL_ITEM_WIZARD_PRINTERS)
-                show_add_menu();
-            else
-            {
-                ConfigWizard::StartPage sp = ConfigWizard::SP_WELCOME;
-                switch (marker) {
-                case LABEL_ITEM_WIZARD_FILAMENTS: sp = ConfigWizard::SP_FILAMENTS; break;
-                case LABEL_ITEM_WIZARD_MATERIALS: sp = ConfigWizard::SP_MATERIALS; break;
-                default: break;
-                }
-                wxTheApp->CallAfter([sp]() { wxGetApp().run_wizard(ConfigWizard::RR_USER, sp); });
-            }
-        } else if (marker == LABEL_ITEM_PHYSICAL_PRINTER || this->m_last_selected != selected_item || m_collection->current_is_dirty() ) {
-            this->m_last_selected = selected_item;
-            evt.SetInt(this->m_type);
-            evt.Skip();
-        } else {
-            evt.StopPropagation();
-        }
-    });
-
     if (m_type == Preset::TYPE_FILAMENT)
     {
         Bind(wxEVT_LEFT_DOWN, [this](wxMouseEvent &event) {
@@ -717,6 +692,35 @@ PlaterPresetComboBox::~PlaterPresetComboBox()
         edit_btn->Destroy();
 }
 
+void PlaterPresetComboBox::OnSelect(wxCommandEvent &evt)
+{
+    auto selected_item = evt.GetSelection();
+
+    auto marker = reinterpret_cast<Marker>(this->GetClientData(selected_item));
+    if (marker >= LABEL_ITEM_MARKER && marker < LABEL_ITEM_MAX) {
+        this->SetSelection(this->m_last_selected);
+        evt.StopPropagation();
+        if (marker == LABEL_ITEM_MARKER)
+            return;
+        if (marker == LABEL_ITEM_WIZARD_PRINTERS)
+            show_add_menu();
+        else {
+            ConfigWizard::StartPage sp = ConfigWizard::SP_WELCOME;
+            switch (marker) {
+            case LABEL_ITEM_WIZARD_FILAMENTS: sp = ConfigWizard::SP_FILAMENTS; break;
+            case LABEL_ITEM_WIZARD_MATERIALS: sp = ConfigWizard::SP_MATERIALS; break;
+            default: break;
+            }
+            wxTheApp->CallAfter([sp]() { wxGetApp().run_wizard(ConfigWizard::RR_USER, sp); });
+        }
+        return;
+    }
+    else if (marker == LABEL_ITEM_PHYSICAL_PRINTER || this->m_last_selected != selected_item || m_collection->current_is_dirty())
+        this->m_last_selected = selected_item;
+        
+    evt.Skip();
+}
+
 bool PlaterPresetComboBox::switch_to_tab()
 {
     Tab* tab = wxGetApp().get_tab(m_type);
@@ -895,7 +899,7 @@ void PlaterPresetComboBox::update()
             for (PhysicalPrinterCollection::ConstIterator it = ph_printers.begin(); it != ph_printers.end(); ++it) {
                 for (const std::string& preset_name : it->get_preset_names()) {
                     Preset* preset = m_collection->find_preset(preset_name);
-                    if (!preset)
+                    if (!preset || !preset->is_visible)
                         continue;
                     std::string main_icon_name, bitmap_key = main_icon_name = preset->printer_technology() == ptSLA ? "sla_printer" : m_main_bitmap_name;
                     wxBitmap* bmp = get_bmp(main_icon_name, wide_icons, main_icon_name);
@@ -957,40 +961,42 @@ void PlaterPresetComboBox::msw_rescale()
 TabPresetComboBox::TabPresetComboBox(wxWindow* parent, Preset::Type preset_type) :
     PresetComboBox(parent, preset_type, wxSize(35 * wxGetApp().em_unit(), -1))
 {
-    Bind(wxEVT_COMBOBOX, [this](wxCommandEvent& evt) {
-        // see https://github.com/prusa3d/PrusaSlicer/issues/3889
-        // Under OSX: in case of use of a same names written in different case (like "ENDER" and "Ender")
-        // m_presets_choice->GetSelection() will return first item, because search in PopupListCtrl is case-insensitive.
-        // So, use GetSelection() from event parameter 
-        auto selected_item = evt.GetSelection();
+}
 
-        auto marker = reinterpret_cast<Marker>(this->GetClientData(selected_item));
-        if (marker >= LABEL_ITEM_DISABLED && marker < LABEL_ITEM_MAX) {
-            this->SetSelection(this->m_last_selected);
-            if (marker == LABEL_ITEM_WIZARD_PRINTERS)
-                wxTheApp->CallAfter([this]() {
-                wxGetApp().run_wizard(ConfigWizard::RR_USER, ConfigWizard::SP_PRINTERS);
+void TabPresetComboBox::OnSelect(wxCommandEvent &evt)
+{
+    // see https://github.com/prusa3d/PrusaSlicer/issues/3889
+    // Under OSX: in case of use of a same names written in different case (like "ENDER" and "Ender")
+    // m_presets_choice->GetSelection() will return first item, because search in PopupListCtrl is case-insensitive.
+    // So, use GetSelection() from event parameter 
+    auto selected_item = evt.GetSelection();
 
-                // update combobox if its parent is a PhysicalPrinterDialog
-                PhysicalPrinterDialog* parent = dynamic_cast<PhysicalPrinterDialog*>(this->GetParent());
-                if (parent != nullptr)
-                    update();
-            });
-        }
-        else if (on_selection_changed && (m_last_selected != selected_item || m_collection->current_is_dirty()) ) {
-            m_last_selected = selected_item;
-            on_selection_changed(selected_item);
-        }
+    auto marker = reinterpret_cast<Marker>(this->GetClientData(selected_item));
+    if (marker >= LABEL_ITEM_DISABLED && marker < LABEL_ITEM_MAX) {
+        this->SetSelection(this->m_last_selected);
+        if (marker == LABEL_ITEM_WIZARD_PRINTERS)
+            wxTheApp->CallAfter([this]() {
+            wxGetApp().run_wizard(ConfigWizard::RR_USER, ConfigWizard::SP_PRINTERS);
 
-        evt.StopPropagation();
+            // update combobox if its parent is a PhysicalPrinterDialog
+            PhysicalPrinterDialog* parent = dynamic_cast<PhysicalPrinterDialog*>(this->GetParent());
+            if (parent != nullptr)
+                update();
+        });
+    }
+    else if (on_selection_changed && (m_last_selected != selected_item || m_collection->current_is_dirty())) {
+        m_last_selected = selected_item;
+        on_selection_changed(selected_item);
+    }
+
+    evt.StopPropagation();
 #ifdef __WXMSW__
-        // From the Win 2004 preset combobox lose a focus after change the preset selection
-        // and that is why the up/down arrow doesn't work properly
-        // (see https://github.com/prusa3d/PrusaSlicer/issues/5531 ).
-        // So, set the focus to the combobox explicitly
-        this->SetFocus();
-#endif    
-    });
+    // From the Win 2004 preset combobox lose a focus after change the preset selection
+    // and that is why the up/down arrow doesn't work properly
+    // (see https://github.com/prusa3d/PrusaSlicer/issues/5531 ).
+    // So, set the focus to the combobox explicitly
+    this->SetFocus();
+#endif
 }
 
 wxString TabPresetComboBox::get_preset_name(const Preset& preset)
@@ -1080,7 +1086,7 @@ void TabPresetComboBox::update()
             for (PhysicalPrinterCollection::ConstIterator it = ph_printers.begin(); it != ph_printers.end(); ++it) {
                 for (const std::string& preset_name : it->get_preset_names()) {
                     Preset* preset = m_collection->find_preset(preset_name);
-                    if (!preset)
+                    if (!preset || !preset->is_visible)
                         continue;
                     std::string main_icon_name = preset->printer_technology() == ptSLA ? "sla_printer" : m_main_bitmap_name;
 
diff --git a/src/slic3r/GUI/PresetComboBoxes.hpp b/src/slic3r/GUI/PresetComboBoxes.hpp
index 6f41c95f4..efcbec370 100644
--- a/src/slic3r/GUI/PresetComboBoxes.hpp
+++ b/src/slic3r/GUI/PresetComboBoxes.hpp
@@ -71,6 +71,7 @@ public:
     void             show_all(bool show_all);
     virtual void update();
     virtual void msw_rescale();
+    virtual void OnSelect(wxCommandEvent& evt);
 
 protected:
     typedef std::size_t Marker;
@@ -167,6 +168,7 @@ public:
     wxString get_preset_name(const Preset& preset) override;
     void update() override;
     void msw_rescale() override;
+    void OnSelect(wxCommandEvent& evt) override;
 
 private:
     int     m_extruder_idx = -1;
@@ -193,6 +195,7 @@ public:
     void update() override;
     void update_dirty();
     void msw_rescale() override;
+    void OnSelect(wxCommandEvent& evt) override;
 
     void set_enable_all(bool enable=true) { m_enable_all = enable; }
 
diff --git a/src/slic3r/GUI/SavePresetDialog.cpp b/src/slic3r/GUI/SavePresetDialog.cpp
index e659f8e02..9c5e72fde 100644
--- a/src/slic3r/GUI/SavePresetDialog.cpp
+++ b/src/slic3r/GUI/SavePresetDialog.cpp
@@ -209,12 +209,12 @@ SavePresetDialog::~SavePresetDialog()
 void SavePresetDialog::build(std::vector<Preset::Type> types, std::string suffix)
 {
     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW));
-#if ENABLE_WX_3_1_3_DPI_CHANGED_EVENT && defined(__WXMSW__)
+#if defined(__WXMSW__)
     // ys_FIXME! temporary workaround for correct font scaling
     // Because of from wxWidgets 3.1.3 auto rescaling is implemented for the Fonts,
     // From the very beginning set dialog font to the wxSYS_DEFAULT_GUI_FONT
     this->SetFont(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
-#endif // ENABLE_WX_3_1_3_DPI_CHANGED_EVENT
+#endif // __WXMSW__
 
     if (suffix.empty())
         suffix = _CTX_utf8(L_CONTEXT("Copy", "PresetName"), "PresetName");
diff --git a/src/slic3r/GUI/Tab.cpp b/src/slic3r/GUI/Tab.cpp
index 374789815..eeb420e3e 100644
--- a/src/slic3r/GUI/Tab.cpp
+++ b/src/slic3r/GUI/Tab.cpp
@@ -1732,10 +1732,10 @@ bool Tab::validate_custom_gcode(const wxString& title, const std::string& gcode)
     return !invalid;
 }
 
-static void validate_custom_gcode_cb(Tab* tab, ConfigOptionsGroupShp opt_group, const boost::any& value) {
+static void validate_custom_gcode_cb(Tab* tab, ConfigOptionsGroupShp opt_group, const t_config_option_key& opt_key, const boost::any& value) {
     Tab::validate_custom_gcode(opt_group->title, boost::any_cast<std::string>(value));
     tab->update_dirty();
-    tab->update();
+    tab->on_value_change(opt_key, value);
 }
 #endif // ENABLE_VALIDATE_CUSTOM_GCODE
 
@@ -1964,7 +1964,7 @@ void TabFilament::build()
         optgroup = page->new_optgroup(L("Start G-code"), 0);
 #if ENABLE_VALIDATE_CUSTOM_GCODE
         optgroup->m_on_change = [this, optgroup](const t_config_option_key& opt_key, const boost::any& value) {
-            validate_custom_gcode_cb(this, optgroup, value);
+            validate_custom_gcode_cb(this, optgroup, opt_key, value);
         };
 #endif // ENABLE_VALIDATE_CUSTOM_GCODE
         option = optgroup->get_option("start_filament_gcode");
@@ -1976,7 +1976,7 @@ void TabFilament::build()
         optgroup = page->new_optgroup(L("End G-code"), 0);
 #if ENABLE_VALIDATE_CUSTOM_GCODE
         optgroup->m_on_change = [this, optgroup](const t_config_option_key& opt_key, const boost::any& value) {
-            validate_custom_gcode_cb(this, optgroup, value);
+            validate_custom_gcode_cb(this, optgroup, opt_key, value);
         };
 #endif // ENABLE_VALIDATE_CUSTOM_GCODE
         option = optgroup->get_option("end_filament_gcode");
@@ -2273,17 +2273,11 @@ void TabPrinter::build_fff()
 
     const int gcode_field_height = 15; // 150
     const int notes_field_height = 25; // 250
-#if ENABLE_VALIDATE_CUSTOM_GCODE
-    // WARNING !!
-    // if you are going to change any of the following optgroup/option titles
-    // or to add/remove optgroups/options
-    // update also TabPrinter::validate_custom_gcodes()
-#endif // ENABLE_VALIDATE_CUSTOM_GCODE
     page = add_options_page(L("Custom G-code"), "cog");
         optgroup = page->new_optgroup(L("Start G-code"), 0);
 #if ENABLE_VALIDATE_CUSTOM_GCODE
         optgroup->m_on_change = [this, optgroup](const t_config_option_key& opt_key, const boost::any& value) {
-            validate_custom_gcode_cb(this, optgroup, boost::any_cast<std::string>(value));
+            validate_custom_gcode_cb(this, optgroup, opt_key, value);
         };
 #endif // ENABLE_VALIDATE_CUSTOM_GCODE
         option = optgroup->get_option("start_gcode");
@@ -2295,7 +2289,7 @@ void TabPrinter::build_fff()
         optgroup = page->new_optgroup(L("End G-code"), 0);
 #if ENABLE_VALIDATE_CUSTOM_GCODE
         optgroup->m_on_change = [this, optgroup](const t_config_option_key& opt_key, const boost::any& value) {
-            validate_custom_gcode_cb(this, optgroup, boost::any_cast<std::string>(value));
+            validate_custom_gcode_cb(this, optgroup, opt_key, value);
         };
 #endif // ENABLE_VALIDATE_CUSTOM_GCODE
         option = optgroup->get_option("end_gcode");
@@ -2307,7 +2301,7 @@ void TabPrinter::build_fff()
         optgroup = page->new_optgroup(L("Before layer change G-code"), 0);
 #if ENABLE_VALIDATE_CUSTOM_GCODE
         optgroup->m_on_change = [this, optgroup](const t_config_option_key& opt_key, const boost::any& value) {
-            validate_custom_gcode_cb(this, optgroup, boost::any_cast<std::string>(value));
+            validate_custom_gcode_cb(this, optgroup, opt_key, value);
         };
 #endif // ENABLE_VALIDATE_CUSTOM_GCODE
         option = optgroup->get_option("before_layer_gcode");
@@ -2319,7 +2313,7 @@ void TabPrinter::build_fff()
         optgroup = page->new_optgroup(L("After layer change G-code"), 0);
 #if ENABLE_VALIDATE_CUSTOM_GCODE
         optgroup->m_on_change = [this, optgroup](const t_config_option_key& opt_key, const boost::any& value) {
-            validate_custom_gcode_cb(this, optgroup, boost::any_cast<std::string>(value));
+            validate_custom_gcode_cb(this, optgroup, opt_key, value);
         };
 #endif // ENABLE_VALIDATE_CUSTOM_GCODE
         option = optgroup->get_option("layer_gcode");
@@ -2331,7 +2325,7 @@ void TabPrinter::build_fff()
         optgroup = page->new_optgroup(L("Tool change G-code"), 0);
 #if ENABLE_VALIDATE_CUSTOM_GCODE
         optgroup->m_on_change = [this, optgroup](const t_config_option_key& opt_key, const boost::any& value) {
-            validate_custom_gcode_cb(this, optgroup, boost::any_cast<std::string>(value));
+            validate_custom_gcode_cb(this, optgroup, opt_key, value);
         };
 #endif // ENABLE_VALIDATE_CUSTOM_GCODE
         option = optgroup->get_option("toolchange_gcode");
@@ -2343,7 +2337,7 @@ void TabPrinter::build_fff()
         optgroup = page->new_optgroup(L("Between objects G-code (for sequential printing)"), 0);
 #if ENABLE_VALIDATE_CUSTOM_GCODE
         optgroup->m_on_change = [this, optgroup](const t_config_option_key& opt_key, const boost::any& value) {
-            validate_custom_gcode_cb(this, optgroup, boost::any_cast<std::string>(value));
+            validate_custom_gcode_cb(this, optgroup, opt_key, value);
         };
 #endif // ENABLE_VALIDATE_CUSTOM_GCODE
         option = optgroup->get_option("between_objects_gcode");
@@ -2355,7 +2349,7 @@ void TabPrinter::build_fff()
         optgroup = page->new_optgroup(L("Color Change G-code"), 0);
 #if ENABLE_VALIDATE_CUSTOM_GCODE
         optgroup->m_on_change = [this, optgroup](const t_config_option_key& opt_key, const boost::any& value) {
-            validate_custom_gcode_cb(this, optgroup, boost::any_cast<std::string>(value));
+            validate_custom_gcode_cb(this, optgroup, opt_key, value);
         };
 #endif // ENABLE_VALIDATE_CUSTOM_GCODE
         option = optgroup->get_option("color_change_gcode");
@@ -2366,7 +2360,7 @@ void TabPrinter::build_fff()
         optgroup = page->new_optgroup(L("Pause Print G-code"), 0);
 #if ENABLE_VALIDATE_CUSTOM_GCODE
         optgroup->m_on_change = [this, optgroup](const t_config_option_key& opt_key, const boost::any& value) {
-            validate_custom_gcode_cb(this, optgroup, boost::any_cast<std::string>(value));
+            validate_custom_gcode_cb(this, optgroup, opt_key, value);
         };
 #endif // ENABLE_VALIDATE_CUSTOM_GCODE
         option = optgroup->get_option("pause_print_gcode");
@@ -2377,7 +2371,7 @@ void TabPrinter::build_fff()
         optgroup = page->new_optgroup(L("Template Custom G-code"), 0);
 #if ENABLE_VALIDATE_CUSTOM_GCODE
         optgroup->m_on_change = [this, optgroup](const t_config_option_key& opt_key, const boost::any& value) {
-            validate_custom_gcode_cb(this, optgroup, boost::any_cast<std::string>(value));
+            validate_custom_gcode_cb(this, optgroup, opt_key, value);
         };
 #endif // ENABLE_VALIDATE_CUSTOM_GCODE
         option = optgroup->get_option("template_custom_gcode");
@@ -3832,15 +3826,35 @@ void TabPrinter::apply_extruder_cnt_from_cache()
 #if ENABLE_VALIDATE_CUSTOM_GCODE
 bool Tab::validate_custom_gcodes()
 {
+    if (m_type != Preset::TYPE_FILAMENT &&
+        (m_type != Preset::TYPE_PRINTER || static_cast<TabPrinter*>(this)->m_printer_technology != ptFFF))
+        return true;
+    if (m_active_page->title() != L("Custom G-code"))
+        return true;
+
     bool valid = true;
-    if ((m_type == Preset::TYPE_FILAMENT || 
-        m_type == Preset::TYPE_PRINTER && static_cast<TabPrinter*>(this)->m_printer_technology == ptFFF) &&
-        m_active_page->title() == "Custom G-code") {
-            for (auto opt_group : m_active_page->m_optgroups) {
-                assert(opt_group->opt_map().size() == 1);
-                std::string key = opt_group->opt_map().begin()->first;
-                valid &= validate_custom_gcode(opt_group->title, boost::any_cast<std::string>(opt_group->get_value(key)));
-            }
+    for (auto opt_group : m_active_page->m_optgroups) {
+        assert(opt_group->opt_map().size() == 1);
+        std::string key = opt_group->opt_map().begin()->first;
+        std::string value = boost::any_cast<std::string>(opt_group->get_value(key));
+        std::string config_value = m_config->opt_string(key);
+        valid &= validate_custom_gcode(opt_group->title, value);
+        Field* field = opt_group->get_field(key);
+        TextCtrl* text_ctrl = dynamic_cast<TextCtrl*>(field);
+        if (text_ctrl != nullptr && text_ctrl->m_on_change != nullptr && !text_ctrl->m_disable_change_event) {
+            Slic3r::GUI::t_change callback = opt_group->m_on_change;
+            // temporary disable the opt_group->m_on_change callback to avoid multiple validations
+            opt_group->m_on_change = nullptr;
+            text_ctrl->m_on_change(key, value);
+            // restore the opt_group->m_on_change callback
+            opt_group->m_on_change = callback;
+
+            update_dirty();
+            on_value_change(key, value);
+        }
+
+        if (!valid)
+            break;
     }
     return valid;
 }
diff --git a/src/slic3r/GUI/UnsavedChangesDialog.cpp b/src/slic3r/GUI/UnsavedChangesDialog.cpp
index 473f7e6e1..7c0be76a4 100644
--- a/src/slic3r/GUI/UnsavedChangesDialog.cpp
+++ b/src/slic3r/GUI/UnsavedChangesDialog.cpp
@@ -601,7 +601,7 @@ void DiffViewCtrl::AppendBmpTextColumn(const wxString& label, unsigned model_col
 #ifdef SUPPORTS_MARKUP
     rd->EnableMarkup(true);
 #endif
-    wxDataViewColumn* column = new wxDataViewColumn(label, rd, model_column, width, wxALIGN_TOP, wxDATAVIEW_COL_RESIZABLE | wxDATAVIEW_CELL_INERT);
+    wxDataViewColumn* column = new wxDataViewColumn(label, rd, model_column, width * m_em_unit, wxALIGN_TOP, wxDATAVIEW_COL_RESIZABLE | wxDATAVIEW_CELL_INERT);
 #else
     wxDataViewColumn* column = new wxDataViewColumn(label, new BitmapTextRenderer(true, wxDATAVIEW_CELL_INERT), model_column, width * m_em_unit, wxALIGN_TOP, wxDATAVIEW_COL_RESIZABLE);
 #endif //__linux__
@@ -792,12 +792,12 @@ void UnsavedChangesDialog::build(Preset::Type type, PresetCollection* dependent_
     wxColour bgr_clr = wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW);
     SetBackgroundColour(bgr_clr);
 
-#if ENABLE_WX_3_1_3_DPI_CHANGED_EVENT && defined(__WXMSW__)
+#if defined(__WXMSW__)
     // ys_FIXME! temporary workaround for correct font scaling
     // Because of from wxWidgets 3.1.3 auto rescaling is implemented for the Fonts,
     // From the very beginning set dialog font to the wxSYS_DEFAULT_GUI_FONT
     this->SetFont(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
-#endif // ENABLE_WX_3_1_3_DPI_CHANGED_EVENT
+#endif // __WXMSW__
 
     int border = 10;
     int em = em_unit();
@@ -806,7 +806,7 @@ void UnsavedChangesDialog::build(Preset::Type type, PresetCollection* dependent_
     m_action_line->SetFont(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT).Bold());
 
     m_tree = new DiffViewCtrl(this, wxSize(em * 60, em * 30));
-    m_tree->AppendToggleColumn_(L"\u2714"      , DiffModel::colToggle, wxLinux ? 8 : 6);
+    m_tree->AppendToggleColumn_(L"\u2714"      , DiffModel::colToggle, wxLinux ? 9 : 6);
     m_tree->AppendBmpTextColumn(""             , DiffModel::colIconText, 28);
     m_tree->AppendBmpTextColumn(_L("Old Value"), DiffModel::colOldValue, 12);
     m_tree->AppendBmpTextColumn(_L("New Value"), DiffModel::colNewValue, 12);
@@ -1375,12 +1375,12 @@ DiffPresetDialog::DiffPresetDialog(MainFrame* mainframe)
     wxColour bgr_clr = wxSystemSettings::GetColour(wxSYS_COLOUR_WINDOW);
     SetBackgroundColour(bgr_clr);
 
-#if ENABLE_WX_3_1_3_DPI_CHANGED_EVENT && defined(__WXMSW__)
+#if defined(__WXMSW__)
     // ys_FIXME! temporary workaround for correct font scaling
     // Because of from wxWidgets 3.1.3 auto rescaling is implemented for the Fonts,
     // From the very beginning set dialog font to the wxSYS_DEFAULT_GUI_FONT
     this->SetFont(wxSystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT));
-#endif // ENABLE_WX_3_1_3_DPI_CHANGED_EVENT
+#endif // __WXMSW__
 
     int border = 10;
     int em = em_unit();
diff --git a/tests/libslic3r/CMakeLists.txt b/tests/libslic3r/CMakeLists.txt
index 501af0c6f..f93cf10af 100644
--- a/tests/libslic3r/CMakeLists.txt
+++ b/tests/libslic3r/CMakeLists.txt
@@ -11,6 +11,7 @@ add_executable(${_TEST_NAME}_tests
 	test_geometry.cpp
 	test_placeholder_parser.cpp
 	test_polygon.cpp
+	test_mutable_polygon.cpp
 	test_stl.cpp
 	test_meshsimplify.cpp
 	test_meshboolean.cpp
diff --git a/tests/libslic3r/test_mutable_polygon.cpp b/tests/libslic3r/test_mutable_polygon.cpp
new file mode 100644
index 000000000..2214da6ef
--- /dev/null
+++ b/tests/libslic3r/test_mutable_polygon.cpp
@@ -0,0 +1,145 @@
+#include <catch2/catch.hpp>
+
+#include "libslic3r/MutablePolygon.hpp"
+
+using namespace Slic3r;
+
+SCENARIO("Iterators", "[MutablePolygon]") {
+    GIVEN("Polygon with three points") {
+        Slic3r::MutablePolygon p({ { 0, 0 }, { 0, 1 }, { 1, 0 } });
+        WHEN("Iterating upwards") {
+            auto begin = p.begin();
+            auto end   = p.end();
+            auto it    = begin;
+            THEN("++ it is not equal to begin") { 
+                REQUIRE(++ it != begin);
+            } THEN("++ it is not equal to end")   { 
+                REQUIRE(++ it != end);
+            } THEN("++ (++ it) is not equal to begin") { 
+                REQUIRE(++ (++ it) != begin);
+            } THEN("++ (++ it) is equal to end") { 
+                REQUIRE(++ (++ it) == end);
+            } THEN("++ (++ (++ it)) is equal to begin") { 
+                REQUIRE(++ (++ (++ it)) == begin);
+            } THEN("++ (++ (++ it)) is not equal to end") { 
+                REQUIRE(++ (++ (++ it)) != end);
+            } 
+        }
+        WHEN("Iterating downwards") {
+            auto begin = p.begin();
+            auto end = p.end();
+            auto it = begin;
+            THEN("-- it is not equal to begin") {
+                REQUIRE(-- it != begin);
+            } THEN("-- it is equal to end") {
+                REQUIRE(-- it == end);
+            } THEN("-- (-- it) is not equal to begin") {
+                REQUIRE(-- (-- it) != begin);
+            } THEN("-- (-- it) is not equal to end") {
+                REQUIRE(-- (-- it) != end);
+            } THEN("-- (-- (-- it)) is equal to begin") {
+                REQUIRE(-- (-- (-- it)) == begin);
+            } THEN("-- (-- (-- it)) is not equal to end") {
+                REQUIRE(-- (-- (-- it)) != end);
+            }
+        }
+        WHEN("Deleting 1st point") {
+            auto it_2nd = p.begin().next();
+            auto it_3rd = p.end();
+            auto it     = p.begin().remove();
+            THEN("Size is 2") {
+                REQUIRE(p.size() == 2);
+            } THEN("p.begin().remove() == it_2nd") {
+                REQUIRE(it == it_2nd);
+            } THEN("it_2nd == new begin()") {
+                REQUIRE(it_2nd == p.begin());
+            }
+        }
+        WHEN("Deleting 2nd point") {
+            auto it_1st = p.begin();
+            auto it_2nd = it_1st.next();
+            auto it_3rd = p.end();
+            auto it = it_2nd.remove();
+            THEN("Size is 2") {
+                REQUIRE(p.size() == 2);
+                REQUIRE(! p.empty());
+            } THEN("it_2nd.remove() == it_3rd") {
+                REQUIRE(it == it_2nd);
+            } THEN("it_1st == new begin()") {
+                REQUIRE(it_1st == p.begin());
+            }
+        }
+        WHEN("Deleting two points") {
+            p.begin().remove().remove();
+            THEN("Size is 1") {
+                REQUIRE(p.size() == 1);
+            } THEN("p.begin().next() == p.begin()") {
+                REQUIRE(p.begin().next() == p.begin());
+            } THEN("p.begin().prev() == p.begin()") {
+                REQUIRE(p.begin().prev() == p.begin());
+            }
+        }
+        WHEN("Deleting all points") {
+            auto it = p.begin().remove().remove().remove();
+            THEN("Size is 0") {
+                REQUIRE(p.size() == 0);
+                REQUIRE(p.empty());
+            } THEN("! p.begin().valid()") {
+                REQUIRE(!p.begin().valid());
+            } THEN("last iterator not valid") {
+                REQUIRE(! it.valid());
+            }
+        }
+        WHEN("Inserting a point at the beginning") {
+            p.insert(p.begin(), { 3, 4 });
+            THEN("Polygon content is ok") {
+                REQUIRE(p == MutablePolygon{ { 0, 0 }, { 0, 1 }, { 1, 0 }, { 3, 4 } });
+            }
+        }
+        WHEN("Inserting a point at the 2nd position") {
+            p.insert(++ p.begin(), { 3, 4 });
+            THEN("Polygon content is ok") {
+                REQUIRE(p == MutablePolygon{ { 0, 0 }, { 3, 4 }, { 0, 1 }, { 1, 0 } });
+            }
+        } WHEN("Inserting a point after a point was removed") {
+            size_t capacity = p.capacity();
+            THEN("Initial capacity is 3") {
+                REQUIRE(capacity == 3);
+            }
+            p.begin().remove();
+            THEN("After removal of the 1st point the capacity is still 3") {
+                REQUIRE(p.capacity() == 3);
+            }
+            THEN("After removal of the 1st point the content is ok") {
+                REQUIRE(p == MutablePolygon{ { 0, 1 }, { 1, 0 } });
+            }
+            p.insert(p.begin(), { 5, 6 });
+            THEN("After insertion at head position the polygon content is ok") {
+                REQUIRE(p == MutablePolygon{ { 0, 1 }, { 1, 0 }, { 5, 6 } });
+            } THEN("and the capacity is still 3") {
+                REQUIRE(p.capacity() == 3);
+            }
+        }
+    }
+}
+
+SCENARIO("Remove degenerate points from MutablePolygon", "[MutablePolygon]") {
+    GIVEN("Polygon with duplicate points"){
+        Slic3r::MutablePolygon p({
+            { 0, 0 },
+            { 0, 100 }, { 0, 100 }, { 0, 100 },
+            { 0, 150 },
+            { 0, 200 },
+            { 200, 200 },
+            { 180, 200 }, { 180, 200 },
+            { 180, 20 },
+            { 180, 0 },
+        });
+        WHEN("Duplicate points are removed") {
+            remove_duplicates(p);
+            THEN("Polygon content is ok") {
+                REQUIRE(p == Slic3r::MutablePolygon{ { 0, 0 }, { 0, 100 }, { 0, 150 }, { 0, 200 }, { 200, 200 }, { 180, 200 }, { 180, 20 }, { 180, 0 } });
+            }
+        }
+    }
+}