diff --git a/lib/Slic3r/GUI/Plater.pm b/lib/Slic3r/GUI/Plater.pm
index 00267fe63..016c2e800 100644
--- a/lib/Slic3r/GUI/Plater.pm
+++ b/lib/Slic3r/GUI/Plater.pm
@@ -85,9 +85,13 @@ sub new {
     
     # Initialize handlers for canvases
     my $on_select_object = sub {
-        my ($obj_idx) = @_;
-        # Ignore the special objects (the wipe tower proxy and such).
-        $self->select_object((defined($obj_idx) && $obj_idx >= 0 && $obj_idx < 1000) ? $obj_idx : undef);
+        my ($obj_idx, $vol_idx) = @_;
+                        
+        if (($obj_idx != -1) && ($vol_idx == -1)) {
+            # Ignore the special objects (the wipe tower proxy and such).
+            $self->select_object((defined($obj_idx) && $obj_idx >= 0 && $obj_idx < 1000) ? $obj_idx : undef);
+            $self->item_changed_selection($obj_idx) if (defined($obj_idx));
+        }
     };
     my $on_double_click = sub {
         $self->object_settings_dialog if $self->selected_object;
@@ -217,6 +221,29 @@ sub new {
         my $state = Slic3r::GUI::_3DScene::is_toolbar_item_pressed($self->{canvas3D}, "layersediting");
         $self->on_layer_editing_toggled($state);
     };
+
+    my $on_action_selectbyparts = sub {
+        my $curr = Slic3r::GUI::_3DScene::get_select_by($self->{canvas3D});
+        if ($curr eq 'volume') {
+            Slic3r::GUI::_3DScene::set_select_by($self->{canvas3D}, 'object');
+            my $selections = $self->collect_selections;
+            Slic3r::GUI::_3DScene::set_objects_selections($self->{canvas3D}, \@$selections);
+            Slic3r::GUI::_3DScene::reload_scene($self->{canvas3D}, 1);        
+        }
+        elsif ($curr eq 'object') {
+            Slic3r::GUI::_3DScene::set_select_by($self->{canvas3D}, 'volume');
+            my $selections = [];
+            Slic3r::GUI::_3DScene::set_objects_selections($self->{canvas3D}, \@$selections);
+            Slic3r::GUI::_3DScene::deselect_volumes($self->{canvas3D});
+            Slic3r::GUI::_3DScene::reload_scene($self->{canvas3D}, 1);      
+
+            my ($obj_idx, $object) = $self->selected_object;
+            if (defined $obj_idx) {            
+                my $vol_idx = Slic3r::GUI::_3DScene::get_first_volume_id($self->{canvas3D}, $obj_idx);                 
+                Slic3r::GUI::_3DScene::select_volume($self->{canvas3D}, $vol_idx) if ($vol_idx != -1);
+            }
+        }
+    };
         
     # Initialize 3D plater
     if ($Slic3r::GUI::have_OpenGL) {
@@ -247,6 +274,7 @@ sub new {
         Slic3r::GUI::_3DScene::register_action_cut_callback($self->{canvas3D}, $on_action_cut);
         Slic3r::GUI::_3DScene::register_action_settings_callback($self->{canvas3D}, $on_action_settings);
         Slic3r::GUI::_3DScene::register_action_layersediting_callback($self->{canvas3D}, $on_action_layersediting);
+        Slic3r::GUI::_3DScene::register_action_selectbyparts_callback($self->{canvas3D}, $on_action_selectbyparts);
         Slic3r::GUI::_3DScene::enable_gizmos($self->{canvas3D}, 1);
         Slic3r::GUI::_3DScene::enable_toolbar($self->{canvas3D}, 1);
         Slic3r::GUI::_3DScene::enable_shader($self->{canvas3D}, 1);
@@ -1141,13 +1169,12 @@ sub rotate {
     }
 
     # Let's calculate vector of rotation axis (if we don't have it already)
-    # The minus is there so that the direction is the same as was established
     if (defined $axis) {
         if ($axis == X) {
-            $axis_x = -1;
+            $axis_x = 1;
         }
         if ($axis == Y) {
-            $axis_y = -1;
+            $axis_y = 1;
         }
     }
     
@@ -1182,11 +1209,7 @@ sub rotate {
 #        $model_object->center_around_origin;
 #        $self->reset_thumbnail($obj_idx);
     }
-    
-    if (defined $axis) {
-        Slic3r::GUI::update_rotation_value(deg2rad($angle), $axis == X ? "x" : ($axis == Y ? "y" : "z"));
-    }
-    
+        
     # update print and start background processing
     $self->{print}->add_model_object($model_object, $obj_idx);
     
@@ -2106,17 +2129,18 @@ sub on_config_change {
     $self->schedule_background_process;
 }
 
-sub item_changed_selection{
+sub item_changed_selection {
     my ($self, $obj_idx) = @_;
 
-#    $self->{canvas}->Refresh;
-    if ($self->{canvas3D}) {
-        Slic3r::GUI::_3DScene::deselect_volumes($self->{canvas3D});
-        if ($obj_idx >= 0){
-            my $selections = $self->collect_selections;
-            Slic3r::GUI::_3DScene::update_volumes_selection($self->{canvas3D}, \@$selections);
+    if (($obj_idx >= 0) && ($obj_idx < 1000)) { # skip if wipe tower selected
+        if ($self->{canvas3D}) {
+            Slic3r::GUI::_3DScene::deselect_volumes($self->{canvas3D});
+            if ($obj_idx >= 0) {
+                my $selections = $self->collect_selections;
+                Slic3r::GUI::_3DScene::update_volumes_selection($self->{canvas3D}, \@$selections);
+            }
+#            Slic3r::GUI::_3DScene::render($self->{canvas3D});
         }
-        Slic3r::GUI::_3DScene::render($self->{canvas3D});
     }
 }
 
@@ -2336,12 +2360,24 @@ sub selection_changed {
     }
     
     Slic3r::GUI::_3DScene::enable_toolbar_item($self->{canvas3D}, "layersediting", $layers_height_allowed);
+
+    my $can_select_by_parts = 0;
     
     if ($have_sel) {
         my $model_object = $self->{model}->objects->[$obj_idx];
+        $can_select_by_parts = ($obj_idx >= 0) && ($obj_idx < 1000) && ($model_object->volumes_count > 1);
         Slic3r::GUI::_3DScene::enable_toolbar_item($self->{canvas3D}, "fewer", $model_object->instances_count > 1);
     }
     
+    if ($can_select_by_parts) {
+        # first disable to let the item in the toolbar to switch to the unpressed state
+        Slic3r::GUI::_3DScene::enable_toolbar_item($self->{canvas3D}, "selectbyparts", 0);
+        Slic3r::GUI::_3DScene::enable_toolbar_item($self->{canvas3D}, "selectbyparts", 1);
+    } else {
+        Slic3r::GUI::_3DScene::enable_toolbar_item($self->{canvas3D}, "selectbyparts", 0);
+        Slic3r::GUI::_3DScene::set_select_by($self->{canvas3D}, 'object');
+    }
+        
     if ($self->{object_info_size}) { # have we already loaded the info pane?
         if ($have_sel) {
             my $model_object = $self->{model}->objects->[$obj_idx];
diff --git a/lib/Slic3r/GUI/Plater/OverrideSettingsPanel.pm b/lib/Slic3r/GUI/Plater/OverrideSettingsPanel.pm
index 3b10ed99f..ea4ce7132 100644
--- a/lib/Slic3r/GUI/Plater/OverrideSettingsPanel.pm
+++ b/lib/Slic3r/GUI/Plater/OverrideSettingsPanel.pm
@@ -136,7 +136,7 @@ sub update_optgroup {
             full_labels     => 1,
             label_font      => $Slic3r::GUI::small_font,
             sidetext_font   => $Slic3r::GUI::small_font,
-            label_width     => 120,
+            label_width     => 150,
             on_change       => sub { $self->{on_change}->() if $self->{on_change} },
             extra_column    => sub {
                 my ($line) = @_;
diff --git a/resources/icons/toolbar.png b/resources/icons/toolbar.png
index ce954143d..79246bcf9 100644
Binary files a/resources/icons/toolbar.png and b/resources/icons/toolbar.png differ
diff --git a/resources/profiles/PrusaResearch.idx b/resources/profiles/PrusaResearch.idx
index ba4123588..63a81db49 100644
--- a/resources/profiles/PrusaResearch.idx
+++ b/resources/profiles/PrusaResearch.idx
@@ -1,8 +1,14 @@
 min_slic3r_version = 1.41.0-alpha
+0.2.2 Edited MMU2 Single mode purge line
+0.2.1 Added PET and BVOH settings for MMU2
+0.2.0-beta5 Fixed MMU1 ramming parameters
+0.2.0-beta4 Added filament loading speed at start, increased minimal purge on wipe tower
+0.2.0-beta3 Edited ramming parameters and filament cooling moves for MMU2
+0.2.0-beta2 Edited first layer speed and wipe tower position
 0.2.0-beta Removed limit on the MK3MMU2 height, added legacy M204 S T format to the MK2 profiles
 0.2.0-alpha8 Added filament_load/unload_time for the PLA/ABS MMU2 filament presets.
-0.2.0-alpha7 Fixed the *MK3* references
-0.2.0-alpha6
+0.2.0-alpha7 Vojtech's fix the incorrect *MK3* references
+0.2.0-alpha6 Jindra's way to fix the 0.2.0-alpha5 version
 0.2.0-alpha5 Bumped up firmware versions for MK2.5/MK3 to 3.3.1, disabled priming areas for MK3MMU2
 0.2.0-alpha4 Extended the custom start/end G-codes of the MMU2.0 printers for no priming towers.
 0.2.0-alpha3 Adjusted machine limits for time estimates, added filament density and cost
diff --git a/resources/profiles/PrusaResearch.ini b/resources/profiles/PrusaResearch.ini
index 32ec800e7..3b44a4bc7 100644
--- a/resources/profiles/PrusaResearch.ini
+++ b/resources/profiles/PrusaResearch.ini
@@ -5,7 +5,7 @@
 name = Prusa Research
 # Configuration version of this file. Config file will only be installed, if the config_version differs.
 # This means, the server may force the Slic3r configuration to be downgraded.
-config_version = 0.2.0-beta
+config_version = 0.2.2
 # Where to get the updates from?
 config_update_url = https://raw.githubusercontent.com/prusa3d/Slic3r-settings/master/live/PrusaResearch/
 
@@ -67,7 +67,7 @@ fill_pattern = cubic
 first_layer_acceleration = 1000
 first_layer_extrusion_width = 0.42
 first_layer_height = 0.2
-first_layer_speed = 30
+first_layer_speed = 20
 gap_fill_speed = 40
 gcode_comments = 0
 infill_every_layers = 1
@@ -113,7 +113,7 @@ support_material_interface_extruder = 0
 support_material_angle = 0
 support_material_buildplate_only = 0
 support_material_enforce_layers = 0
-support_material_contact_distance = 0.15
+support_material_contact_distance = 0.1
 support_material_interface_contact_loops = 0
 support_material_interface_layers = 2
 support_material_interface_spacing = 0.2
@@ -122,9 +122,9 @@ support_material_pattern = rectilinear
 support_material_spacing = 2
 support_material_speed = 50
 support_material_synchronize_layers = 0
-support_material_threshold = 45
+support_material_threshold = 55
 support_material_with_sheath = 0
-support_material_xy_spacing = 60%
+support_material_xy_spacing = 50%
 thin_walls = 0
 top_infill_extrusion_width = 0.45
 top_solid_infill_speed = 40
@@ -133,13 +133,15 @@ wipe_tower = 1
 wipe_tower_bridging = 10
 wipe_tower_rotation_angle = 0
 wipe_tower_width = 60
-wipe_tower_x = 180
-wipe_tower_y = 135
+wipe_tower_x = 170
+wipe_tower_y = 140
 xy_size_compensation = 0
 
 [print:*MK3*]
 fill_pattern = grid
 single_extruder_multi_material_priming = 0
+wipe_tower_x = 170
+wipe_tower_y = 125
 
 # Print parameters common to a 0.25mm diameter nozzle.
 [print:*0.25nozzle*]
@@ -557,13 +559,17 @@ compatible_printers_condition = ! (printer_notes=~/.*PRINTER_VENDOR_PRUSA3D.*/ a
 end_filament_gcode = "; Filament-specific end gcode"
 extrusion_multiplier = 1
 filament_loading_speed = 28
+filament_loading_speed_start = 3
 filament_unloading_speed = 90
+filament_unloading_speed_start = 100
 filament_toolchange_delay = 0
 filament_cooling_moves = 4
 filament_cooling_initial_speed = 2.2
 filament_cooling_final_speed = 3.4
+filament_load_time = 0
+filament_unload_time = 0
 filament_ramming_parameters = "120 100 6.6 6.8 7.2 7.6 7.9 8.2 8.7 9.4 9.9 10.0| 0.05 6.6 0.45 6.8 0.95 7.8 1.45 8.3 1.95 9.7 2.45 10 2.95 7.6 3.45 7.6 3.95 7.6 4.45 7.6 4.95 7.6"
-filament_minimal_purge_on_wipe_tower = 5
+filament_minimal_purge_on_wipe_tower = 15
 filament_cost = 0
 filament_density = 0
 filament_diameter = 1.75
@@ -664,6 +670,8 @@ cooling = 1
 disable_fan_first_layers = 3
 fan_always_on = 0
 fan_below_layer_time = 10
+filament_cost = 58.66
+filament_density = 1.18
 first_layer_bed_temperature = 105
 first_layer_temperature = 270
 max_fan_speed = 20
@@ -741,7 +749,7 @@ temperature = 260
 
 [filament:E3D Edge]
 inherits = *PET*
-filament_cost = 0
+filament_cost = 56.9
 filament_density = 1.26
 filament_notes = "List of manufacturers tested with standart PET print settings for MK2:\n\nE3D Edge\nFillamentum CPE GH100\nPlasty Mladeč PETG"
 
@@ -754,14 +762,14 @@ temperature = 270
 
 [filament:Fillamentum ABS]
 inherits = *ABS*
-filament_cost = 0
+filament_cost = 32.4
 filament_density = 1.04
 first_layer_temperature = 240
 temperature = 240
 
 [filament:Fillamentum ASA]
 inherits = *ABS*
-filament_cost = 0
+filament_cost = 38.7
 filament_density = 1.04
 fan_always_on = 1
 first_layer_temperature = 265
@@ -769,7 +777,7 @@ temperature = 265
 
 [filament:Fillamentum CPE HG100 HM100]
 inherits = *PET*
-filament_cost = 0
+filament_cost = 54.1
 filament_density = 1.25
 filament_notes = "CPE HG100 , CPE HM100"
 first_layer_bed_temperature = 90
@@ -783,7 +791,7 @@ inherits = *PLA*
 # For now, all but selected filaments are disabled for the MMU 2.0
 compatible_printers_condition = nozzle_diameter[0]>0.35 and ! (printer_notes=~/.*PRINTER_VENDOR_PRUSA3D.*/ and printer_notes=~/.*PRINTER_MODEL_MK3.*/ and single_extruder_multi_material)
 extrusion_multiplier = 1.2
-filament_cost = 0
+filament_cost = 68
 filament_density = 1.15
 filament_colour = #804040
 filament_max_volumetric_speed = 10
@@ -793,24 +801,26 @@ temperature = 190
 
 [filament:Generic ABS]
 inherits = *ABS*
-filament_cost = 0
+filament_cost = 27.82
 filament_density = 1.04
 filament_notes = "List of materials tested with standart ABS print settings for MK2:\n\nEsun ABS\nFil-A-Gehr ABS\nHatchboxABS\nPlasty Mladeč ABS"
 
 [filament:Generic PET]
 inherits = *PET*
-filament_cost = 0
+filament_cost = 27.82
 filament_density = 1.24
 filament_notes = "List of manufacturers tested with standart PET print settings for MK2:\n\nE3D Edge\nFillamentum CPE GH100\nPlasty Mladeč PETG"
 
 [filament:Generic PLA]
 inherits = *PLA*
-filament_cost = 0
+filament_cost = 25.4
 filament_density = 1.27
 filament_notes = "List of materials tested with standart PLA print settings for MK2:\n\nDas Filament\nEsun PLA\nEUMAKERS PLA\nFiberlogy HD-PLA\nFillamentum PLA\nFloreon3D\nHatchbox PLA\nPlasty Mladeč PLA\nPrimavalue PLA\nProto pasta Matte Fiber\nVerbatim PLA\nVerbatim BVOH"
 
 [filament:Polymaker PC-Max]
 inherits = *ABS*
+filament_cost = 77.3
+filament_density = 1.20
 bed_temperature = 115
 filament_colour = #3A80CA
 first_layer_bed_temperature = 100
@@ -819,6 +829,8 @@ temperature = 270
 
 [filament:Primavalue PVA]
 inherits = *PLA*
+filament_cost = 108
+filament_density = 1.23
 cooling = 0
 fan_always_on = 0
 filament_colour = #FFFFD7
@@ -843,10 +855,7 @@ compatible_printers_condition = printer_notes=~/.*PRINTER_VENDOR_PRUSA3D.*/ and
 filament_cooling_final_speed = 50 
 filament_cooling_initial_speed = 10
 filament_cooling_moves = 5
-filament_loading_speed = 14
 filament_ramming_parameters = "120 110 5.32258 5.45161 5.67742 6 6.48387 7.12903 7.90323 8.70968 9.3871 9.83871 10.0968 10.2258| 0.05 5.30967 0.45 5.50967 0.95 6.1871 1.45 7.39677 1.95 9.05484 2.45 10 2.95 10.3098 3.45 13.0839 3.95 7.6 4.45 7.6 4.95 7.6";
-filament_load_time = 12
-filament_unload_time = 11
 
 [filament:Generic ABS MMU2]
 inherits = *ABS MMU2*
@@ -856,6 +865,8 @@ inherits = *ABS MMU2*
 
 [filament:Prusa HIPS]
 inherits = *ABS*
+filament_cost = 27.3
+filament_density = 1.04
 bridge_fan_speed = 50
 cooling = 1
 extrusion_multiplier = 0.9
@@ -876,6 +887,28 @@ filament_cost = 27.82
 filament_density = 1.27
 filament_notes = "List of manufacturers tested with standart PET print settings for MK2:\n\nE3D Edge\nFillamentum CPE GH100\nPlasty Mladeč PETG"
 
+[filament:*PET MMU2*]
+inherits = Prusa PET
+compatible_printers_condition = printer_notes=~/.*PRINTER_VENDOR_PRUSA3D.*/ and printer_notes=~/.*PRINTER_MODEL_MK3.*/ and single_extruder_multi_material
+temperature = 230
+first_layer_temperature = 230
+filament_cooling_final_speed = 1
+filament_cooling_initial_speed = 2
+filament_cooling_moves = 1
+filament_load_time = 12
+filament_loading_speed = 14
+filament_notes = PET
+filament_ramming_parameters = "120 140 4.70968 4.74194 4.77419 4.80645 4.83871 4.87097 4.90323 5 5.25806 5.67742 6.29032 7.06452 7.83871 8.3871| 0.05 4.72901 0.45 4.73545 0.95 4.83226 1.45 4.88067 1.95 5.05483 2.45 5.93553 2.95 7.53556 3.45 8.6323 3.95 7.6 4.45 7.6 4.95 7.6"
+filament_unload_time = 11
+filament_unloading_speed = 20
+filament_unloading_speed_start = 120
+
+[filament:Generic PET MMU2]
+inherits = *PET MMU2*
+
+[filament:Prusa PET MMU2]
+inherits = *PET MMU2*
+
 [filament:Prusa PLA]
 inherits = *PLA*
 filament_cost = 25.4
@@ -885,13 +918,15 @@ filament_notes = "List of materials tested with standart PLA print settings for
 [filament:*PLA MMU2*]
 inherits = Prusa PLA
 compatible_printers_condition = printer_notes=~/.*PRINTER_VENDOR_PRUSA3D.*/ and printer_notes=~/.*PRINTER_MODEL_MK3.*/ and single_extruder_multi_material
-filament_cooling_final_speed = 50
-filament_cooling_initial_speed = 10
-filament_cooling_moves = 7
-filament_loading_speed = 14
-filament_ramming_parameters = "120 110 4.03226 4.12903 4.25806 4.41935 4.58065 4.80645 5.35484 6.29032 7.58065 9.09677 10.5806 11.8387 12.6452 12.9677| 0.05 4.01935 0.45 4.15483 0.95 4.50968 1.45 4.94516 1.95 6.79677 2.45 9.87102 2.95 12.4388 3.45 13.0839 3.95 7.6 4.45 7.6 4.95 7.6"
+temperature = 205
+filament_cooling_final_speed = 1
+filament_cooling_initial_speed = 2
+filament_cooling_moves = 1
 filament_load_time = 12
+filament_loading_speed = 14
+filament_ramming_parameters = "120 110 2.70968 2.93548 3.32258 3.83871 4.58065 5.54839 6.51613 7.35484 7.93548 8.16129| 0.05 2.66451 0.45 3.05805 0.95 4.05807 1.45 5.97742 1.95 7.69999 2.45 8.1936 2.95 11.342 3.45 11.4065 3.95 7.6 4.45 7.6 4.95 7.6"
 filament_unload_time = 11
+filament_unloading_speed = 20
 
 [filament:Generic PLA MMU2]
 inherits = *PLA MMU2*
@@ -901,11 +936,13 @@ inherits = *PLA MMU2*
 
 [filament:SemiFlex or Flexfill 98A]
 inherits = *FLEX*
-filament_cost = 0
+filament_cost = 82
 filament_density = 1.22
 
 [filament:Taulman Bridge]
 inherits = *common*
+filament_cost = 40
+filament_density = 1.13
 bed_temperature = 90
 bridge_fan_speed = 40
 cooling = 0
@@ -925,6 +962,8 @@ temperature = 250
 
 [filament:Taulman T-Glase]
 inherits = *PET*
+filament_cost = 40
+filament_density = 1.27
 bridge_fan_speed = 40
 cooling = 0
 fan_always_on = 0
@@ -936,6 +975,8 @@ start_filament_gcode = "M900 K{if printer_notes=~/.*PRINTER_HAS_BOWDEN.*/}200{el
 
 [filament:Verbatim BVOH]
 inherits = *common*
+filament_cost = 218
+filament_density = 1.23
 bed_temperature = 60
 bridge_fan_speed = 100
 cooling = 0
@@ -944,7 +985,7 @@ extrusion_multiplier = 1
 fan_always_on = 0
 fan_below_layer_time = 100
 filament_colour = #FFFFD7
-filament_max_volumetric_speed = 10
+filament_max_volumetric_speed = 4
 filament_notes = "List of materials tested with standart PLA print settings for MK2:\n\nDas Filament\nEsun PLA\nEUMAKERS PLA\nFiberlogy HD-PLA\nFillamentum PLA\nFloreon3D\nHatchbox PLA\nPlasty Mladeč PLA\nPrimavalue PLA\nProto pasta Matte Fiber\nVerbatim PLA\nVerbatim BVOH"
 filament_soluble = 1
 filament_type = PLA
@@ -955,8 +996,29 @@ min_fan_speed = 100
 start_filament_gcode = "M900 K{if printer_notes=~/.*PRINTER_HAS_BOWDEN.*/}200{else}10{endif}; Filament gcode"
 temperature = 210
 
+[filament:Verbatim BVOH MMU2]
+inherits = Verbatim BVOH
+compatible_printers_condition = printer_notes=~/.*PRINTER_VENDOR_PRUSA3D.*/ and printer_notes=~/.*PRINTER_MODEL_MK3.*/ and single_extruder_multi_material
+temperature = 195
+filament_notes = BVOH
+fan_always_on = 1
+first_layer_temperature = 200
+filament_cooling_final_speed = 1
+filament_cooling_initial_speed = 2
+filament_max_volumetric_speed = 4
+filament_type = PVA
+filament_cooling_moves = 1
+filament_load_time = 12
+filament_loading_speed = 14
+filament_ramming_parameters = "120 110 1.74194 1.90323 2.16129 2.48387 2.83871 3.25806 3.83871 4.6129 5.41935 5.96774| 0.05 1.69677 0.45 1.96128 0.95 2.63872 1.45 3.46129 1.95 4.99031 2.45 6.12908 2.95 8.30974 3.45 11.4065 3.95 7.6 4.45 7.6 4.95 7.6"
+filament_unload_time = 11
+filament_unloading_speed = 20
+filament_unloading_speed_start = 100
+
 [filament:Verbatim PP]
 inherits = *common*
+filament_cost = 72
+filament_density = 0.89
 bed_temperature = 100
 bridge_fan_speed = 100
 cooling = 1
@@ -1207,7 +1269,7 @@ default_filament_profile = Prusa PLA MMU2
 
 [printer:Original Prusa i3 MK3 MMU2 Single]
 inherits = *mm2*
-start_gcode = M107\nM115 U3.3.1 ; tell printer latest fw version\nM83  ; extruder relative mode\nM104 S[first_layer_temperature] ; set extruder temp\nM140 S[first_layer_bed_temperature] ; set bed temp\nM190 S[first_layer_bed_temperature] ; wait for bed temp\nM109 S[first_layer_temperature] ; wait for extruder temp\nG28 W ; home all without mesh bed level\nG80 ; mesh bed leveling\n\nG21 ; set units to millimeters\n\n;go outside print area\nG1 Y-3.0 F1000.0\nG1 Z0.4 F1000.0\n; select extruder\nT?\n; initial load\nG1 X55.0 E32.0 F1073.0\nG1 X5.0 E32.0 F1800.0\nG1 X55.0 E8.0 F2000.0\nG1 Z0.3 F1000.0\nG92 E0.0\nG1 X240.0 E25.0  F2200.0\nG1 Y-2.0 F1000.0\nG1 X55.0 E25 F1400.0\nG1 Z0.20 F1000.0\nG1 X5.0 E4.0 F1000.0\n\nM221 S{if layer_height<0.075}100{else}95{endif}\nG90 ; use absolute coordinates\nM83 ; use relative distances for extrusion\nG92 E0.0\n
+start_gcode = M107\nM115 U3.4.0-RC2 ; tell printer latest fw version\nM83  ; extruder relative mode\nM104 S[first_layer_temperature] ; set extruder temp\nM140 S[first_layer_bed_temperature] ; set bed temp\nM190 S[first_layer_bed_temperature] ; wait for bed temp\nM109 S[first_layer_temperature] ; wait for extruder temp\nG28 W ; home all without mesh bed level\nG80 ; mesh bed leveling\n\nG21 ; set units to millimeters\n\n;go outside print area\nG1 Y-3.0 F1000.0\nG1 Z0.4 F1000.0\n; select extruder\nT?\n; purge line\nG1 X55.0 E8.0 F2000.0\nG1 Z0.3 F1000.0\nG92 E0.0\nG1 X240.0 E25.0  F2200.0\nG1 Y-2.0 F1000.0\nG1 X55.0 E25 F1400.0\nG1 Z0.20 F1000.0\nG1 X5.0 E4.0 F1000.0\n\nM221 S{if layer_height<0.075}100{else}95{endif}\nG90 ; use absolute coordinates\nM83 ; use relative distances for extrusion\nG92 E0.0\n
 end_gcode = G1 X0 Y210 F7200\nG1 E2 F5000\nG1 E2 F5500\nG1 E2 F6000\nG1 E-15.0000 F5800\nG1 E-20.0000 F5500\nG1 E10.0000 F3000\nG1 E-10.0000 F3100\nG1 E10.0000 F3150\nG1 E-10.0000 F3250\nG1 E10.0000 F3300\n\nM702 C\n\nG4 ; wait\nM104 S0 ; turn off temperature\nM140 S0 ; turn off heatbed\nM107 ; turn off fan\nG1 X0 Y200; home X axis\nM84 ; disable motors
 
 [printer:Original Prusa i3 MK3 MMU2]
@@ -1215,9 +1277,10 @@ inherits = *mm2*
 # The 5x nozzle diameter defines the number of extruders. Other extruder parameters
 # (for example the retract values) are duplicaed from the first value, so they do not need 
 # to be defined explicitely.
+machine_max_acceleration_e = 8000,8000
 nozzle_diameter = 0.4,0.4,0.4,0.4,0.4
 extruder_colour = #FF8000;#0080FF;#00FFFF;#FF4F4F;#9FFF9F
-start_gcode = M107\nM115 U3.3.1 ; tell printer latest fw version\nM83  ; extruder relative mode\nM104 S[first_layer_temperature] ; set extruder temp\nM140 S[first_layer_bed_temperature] ; set bed temp\nM190 S[first_layer_bed_temperature] ; wait for bed temp\nM109 S[first_layer_temperature] ; wait for extruder temp\nG28 W ; home all without mesh bed level\nG80 ; mesh bed leveling\nG21 ; set units to millimeters\n\n; Send the filament type to the MMU2.0 unit.\n; E stands for extruder number, F stands for filament type (0: default; 1:flex; 2: PVA)\nM403 E0 F{"" + ((filament_type[0]=="FLEX") ? 1 : ((filament_type[0]=="PVA") ? 2 : 0))}\nM403 E1 F{"" + ((filament_type[1]=="FLEX") ? 1 : ((filament_type[1]=="PVA") ? 2 : 0))}\nM403 E2 F{"" + ((filament_type[2]=="FLEX") ? 1 : ((filament_type[2]=="PVA") ? 2 : 0))}\nM403 E3 F{"" + ((filament_type[3]=="FLEX") ? 1 : ((filament_type[3]=="PVA") ? 2 : 0))}\nM403 E4 F{"" + ((filament_type[4]=="FLEX") ? 1 : ((filament_type[4]=="PVA") ? 2 : 0))}\n\n{if not has_single_extruder_multi_material_priming}\n;go outside print area\nG1 Y-3.0 F1000.0\nG1 Z0.4 F1000.0\n; select extruder\nT[initial_tool]\n; initial load\nG1 X55.0 E32.0 F1073.0\nG1 X5.0 E32.0 F1800.0\nG1 X55.0 E8.0 F2000.0\nG1 Z0.3 F1000.0\nG92 E0.0\nG1 X240.0 E25.0  F2200.0\nG1 Y-2.0 F1000.0\nG1 X55.0 E25 F1400.0\nG1 Z0.20 F1000.0\nG1 X5.0 E4.0 F1000.0\nG92 E0.0\n{endif}\n\n;M221 S{if layer_height<0.075}100{else}95{endif}\nG90 ; use absolute coordinates\nM83 ; use relative distances for extrusion\nG92 E0.0\n
+start_gcode = M107\nM115 U3.4.0-RC2 ; tell printer latest fw version\nM83  ; extruder relative mode\nM104 S[first_layer_temperature] ; set extruder temp\nM140 S[first_layer_bed_temperature] ; set bed temp\nM190 S[first_layer_bed_temperature] ; wait for bed temp\nM109 S[first_layer_temperature] ; wait for extruder temp\nG28 W ; home all without mesh bed level\nG80 ; mesh bed leveling\nG21 ; set units to millimeters\n\n; Send the filament type to the MMU2.0 unit.\n; E stands for extruder number, F stands for filament type (0: default; 1:flex; 2: PVA)\nM403 E0 F{"" + ((filament_type[0]=="FLEX") ? 1 : ((filament_type[0]=="PVA") ? 2 : 0))}\nM403 E1 F{"" + ((filament_type[1]=="FLEX") ? 1 : ((filament_type[1]=="PVA") ? 2 : 0))}\nM403 E2 F{"" + ((filament_type[2]=="FLEX") ? 1 : ((filament_type[2]=="PVA") ? 2 : 0))}\nM403 E3 F{"" + ((filament_type[3]=="FLEX") ? 1 : ((filament_type[3]=="PVA") ? 2 : 0))}\nM403 E4 F{"" + ((filament_type[4]=="FLEX") ? 1 : ((filament_type[4]=="PVA") ? 2 : 0))}\n\n{if not has_single_extruder_multi_material_priming}\n;go outside print area\nG1 Y-3.0 F1000.0\nG1 Z0.4 F1000.0\n; select extruder\nT[initial_tool]\n; initial load\nG1 X55.0 E32.0 F1073.0\nG1 X5.0 E32.0 F1800.0\nG1 X55.0 E8.0 F2000.0\nG1 Z0.3 F1000.0\nG92 E0.0\nG1 X240.0 E25.0  F2200.0\nG1 Y-2.0 F1000.0\nG1 X55.0 E25 F1400.0\nG1 Z0.20 F1000.0\nG1 X5.0 E4.0 F1000.0\nG92 E0.0\n{endif}\n\nM221 S{if layer_height<0.075}100{else}95{endif}\nG90 ; use absolute coordinates\nM83 ; use relative distances for extrusion\nG92 E0.0\n
 end_gcode = {if has_wipe_tower}\nG1 E-15.0000 F3000\n{else}\nG1 X0 Y210 F7200\nG1 E2 F5000\nG1 E2 F5500\nG1 E2 F6000\nG1 E-15.0000 F5800\nG1 E-20.0000 F5500\nG1 E10.0000 F3000\nG1 E-10.0000 F3100\nG1 E10.0000 F3150\nG1 E-10.0000 F3250\nG1 E10.0000 F3300\n{endif}\n\n; Unload filament\nM702 C\n\nG4 ; wait\nM104 S0 ; turn off temperature\nM140 S0 ; turn off heatbed\nM107 ; turn off fan\n; Lift print head a bit\n{if layer_z < max_print_height}G1 Z{z_offset+min(layer_z+30, max_print_height)}{endif} ; Move print head up\nG1 X0 Y200; home X axis\nM84 ; disable motors\n
 
 # The obsolete presets will be removed when upgrading from the legacy configuration structure (up to Slic3r 1.39.2) to 1.40.0 and newer.
diff --git a/xs/src/admesh/stl.h b/xs/src/admesh/stl.h
index 5f7a3c5c1..096430d15 100644
--- a/xs/src/admesh/stl.h
+++ b/xs/src/admesh/stl.h
@@ -173,6 +173,7 @@ extern void stl_mirror_xy(stl_file *stl);
 extern void stl_mirror_yz(stl_file *stl);
 extern void stl_mirror_xz(stl_file *stl);
 extern void stl_transform(stl_file *stl, float *trafo3x4);
+extern void stl_transform(stl_file *stl, const Eigen::Transform<float, 3, Eigen::Affine, Eigen::DontAlign>& t);
 extern void stl_open_merge(stl_file *stl, char *file);
 extern void stl_invalidate_shared_vertices(stl_file *stl);
 extern void stl_generate_shared_vertices(stl_file *stl);
diff --git a/xs/src/admesh/stlinit.cpp b/xs/src/admesh/stlinit.cpp
index 47a37f0a5..e2939b8af 100644
--- a/xs/src/admesh/stlinit.cpp
+++ b/xs/src/admesh/stlinit.cpp
@@ -286,7 +286,7 @@ void stl_read(stl_file *stl, int first_facet, bool first) {
     {
       // skip solid/endsolid
       // (in this order, otherwise it won't work when they are paired in the middle of a file)
-      fscanf(stl->fp, "endsolid\n");
+      fscanf(stl->fp, "endsolid%*[^\n]\n");
       fscanf(stl->fp, "solid%*[^\n]\n");  // name might contain spaces so %*s doesn't work and it also can be empty (just "solid")
       // Leading space in the fscanf format skips all leading white spaces including numerous new lines and tabs.
       int res_normal     = fscanf(stl->fp, " facet normal %31s %31s %31s", normal_buf[0], normal_buf[1], normal_buf[2]);
diff --git a/xs/src/admesh/util.cpp b/xs/src/admesh/util.cpp
index fba1ee76b..cc104fdd1 100644
--- a/xs/src/admesh/util.cpp
+++ b/xs/src/admesh/util.cpp
@@ -155,6 +155,47 @@ void stl_transform(stl_file *stl, float *trafo3x4) {
   calculate_normals(stl);
 }
 
+void stl_transform(stl_file *stl, const Eigen::Transform<float, 3, Eigen::Affine, Eigen::DontAlign>& t)
+{
+    if (stl->error)
+        return;
+
+    unsigned int vertices_count = 3 * (unsigned int)stl->stats.number_of_facets;
+    if (vertices_count == 0)
+        return;
+
+    Eigen::MatrixXf src_vertices(3, vertices_count);
+    stl_facet* facet_ptr = stl->facet_start;
+    unsigned int v_id = 0;
+    while (facet_ptr < stl->facet_start + stl->stats.number_of_facets)
+    {
+        for (int i = 0; i < 3; ++i)
+        {
+            ::memcpy((void*)src_vertices.col(v_id).data(), (const void*)&facet_ptr->vertex[i], 3 * sizeof(float));
+            ++v_id;
+        }
+        facet_ptr += 1;
+    }
+
+    Eigen::MatrixXf dst_vertices(3, vertices_count);
+    dst_vertices = t * src_vertices.colwise().homogeneous();
+
+    facet_ptr = stl->facet_start;
+    v_id = 0;
+    while (facet_ptr < stl->facet_start + stl->stats.number_of_facets)
+    {
+        for (int i = 0; i < 3; ++i)
+        {
+            ::memcpy((void*)&facet_ptr->vertex[i], (const void*)dst_vertices.col(v_id).data(), 3 * sizeof(float));
+            ++v_id;
+        }
+        facet_ptr += 1;
+    }
+
+    stl_get_size(stl);
+    calculate_normals(stl);
+}
+
 void
 stl_rotate_x(stl_file *stl, float angle) {
   int i;
diff --git a/xs/src/libslic3r/Format/3mf.cpp b/xs/src/libslic3r/Format/3mf.cpp
index b838f65c1..4dc40bd3c 100644
--- a/xs/src/libslic3r/Format/3mf.cpp
+++ b/xs/src/libslic3r/Format/3mf.cpp
@@ -1738,10 +1738,7 @@ namespace Slic3r {
                 stream << "   </" << COMPONENTS_TAG << ">\n";
             }
 
-            Transform3d t = Transform3d::Identity();
-            t.translate(Vec3d(instance->offset(0), instance->offset(1), 0.0));
-            t.rotate(Eigen::AngleAxisd(instance->rotation, Vec3d::UnitZ()));
-            t.scale(instance->scaling_factor);
+            Transform3d t = instance->world_matrix();
             build_items.emplace_back(instance_id, t);
 
             stream << "  </" << OBJECT_TAG << ">\n";
diff --git a/xs/src/libslic3r/GCode.cpp b/xs/src/libslic3r/GCode.cpp
index fa18ddf3f..74a376ade 100644
--- a/xs/src/libslic3r/GCode.cpp
+++ b/xs/src/libslic3r/GCode.cpp
@@ -665,6 +665,14 @@ void GCode::_do_export(Print &print, FILE *file, GCodePreviewData *preview_data)
         _write_format(file, "\n");
     }
     
+    // adds tags for time estimators
+    if (print.config.remaining_times.value)
+    {
+        _writeln(file, GCodeTimeEstimator::Normal_First_M73_Output_Placeholder_Tag);
+        if (m_silent_time_estimator_enabled)
+            _writeln(file, GCodeTimeEstimator::Silent_First_M73_Output_Placeholder_Tag);
+    }
+
     // Prepare the helper object for replacing placeholders in custom G-code and output filename.
     m_placeholder_parser = print.placeholder_parser;
     m_placeholder_parser.update_timestamp();
@@ -724,7 +732,6 @@ void GCode::_do_export(Print &print, FILE *file, GCodePreviewData *preview_data)
     m_placeholder_parser.set("has_wipe_tower", has_wipe_tower);
     m_placeholder_parser.set("has_single_extruder_multi_material_priming", has_wipe_tower && print.config.single_extruder_multi_material_priming);
     std::string start_gcode = this->placeholder_parser_process("start_gcode", print.config.start_gcode.value, initial_extruder_id);
-    
     // Set bed temperature if the start G-code does not contain any bed temp control G-codes.
     this->_print_first_layer_bed_temperature(file, print, start_gcode, initial_extruder_id, true);
     // Set extruder(s) temperature before and after start G-code.
diff --git a/xs/src/libslic3r/GCodeTimeEstimator.cpp b/xs/src/libslic3r/GCodeTimeEstimator.cpp
index c4ffb572a..f4f6472e5 100644
--- a/xs/src/libslic3r/GCodeTimeEstimator.cpp
+++ b/xs/src/libslic3r/GCodeTimeEstimator.cpp
@@ -168,6 +168,9 @@ namespace Slic3r {
     }
 #endif // ENABLE_MOVE_STATS
 
+    const std::string GCodeTimeEstimator::Normal_First_M73_Output_Placeholder_Tag = "; NORMAL_FIRST_M73_OUTPUT_PLACEHOLDER";
+    const std::string GCodeTimeEstimator::Silent_First_M73_Output_Placeholder_Tag = "; SILENT_FIRST_M73_OUTPUT_PLACEHOLDER";
+
     GCodeTimeEstimator::GCodeTimeEstimator(EMode mode)
         : _mode(mode)
     {
@@ -294,7 +297,15 @@ namespace Slic3r {
                 throw std::runtime_error(std::string("Remaining times export failed.\nError while reading from file.\n"));
             }
 
-            gcode_line += "\n";
+            // replaces placeholders for initial line M73 with the real lines
+            if (((_mode == Normal) && (gcode_line == Normal_First_M73_Output_Placeholder_Tag)) ||
+                ((_mode == Silent) && (gcode_line == Silent_First_M73_Output_Placeholder_Tag)))
+            {
+                sprintf(time_line, time_mask.c_str(), std::to_string(0), _get_time_minutes(_time).c_str());
+                gcode_line = time_line;
+            }
+            else
+               gcode_line += "\n";
 
             // add remaining time lines where needed
             _parser.parse_line(gcode_line,
diff --git a/xs/src/libslic3r/GCodeTimeEstimator.hpp b/xs/src/libslic3r/GCodeTimeEstimator.hpp
index 1fa74e304..e9da584c3 100644
--- a/xs/src/libslic3r/GCodeTimeEstimator.hpp
+++ b/xs/src/libslic3r/GCodeTimeEstimator.hpp
@@ -17,6 +17,9 @@ namespace Slic3r {
     class GCodeTimeEstimator
     {
     public:
+        static const std::string Normal_First_M73_Output_Placeholder_Tag;
+        static const std::string Silent_First_M73_Output_Placeholder_Tag;
+
         enum EMode : unsigned char
         {
             Normal,
diff --git a/xs/src/libslic3r/Model.cpp b/xs/src/libslic3r/Model.cpp
index 1cd3b1413..19c474cad 100644
--- a/xs/src/libslic3r/Model.cpp
+++ b/xs/src/libslic3r/Model.cpp
@@ -237,7 +237,6 @@ BoundingBoxf3 Model::bounding_box() const
 
 void Model::center_instances_around_point(const Vec2d &point)
 {
-//    BoundingBoxf3 bb = this->bounding_box();
     BoundingBoxf3 bb;
     for (ModelObject *o : this->objects)
         for (size_t i = 0; i < o->instances.size(); ++ i)
@@ -670,22 +669,19 @@ void ModelObject::center_around_origin()
         if (! v->modifier)
 			bb.merge(v->mesh.bounding_box());
     
-    // First align to origin on XYZ, then center it on XY.
-    Vec3d size = bb.size();
-    size(2) = 0.;
-    Vec3d shift3 = - bb.min - 0.5 * size;
-    // Unaligned vector, for the Rotation2D to work on Visual Studio 2013.
-    Eigen::Vector2d shift2 = to_2d(shift3);
-    
-    this->translate(shift3);
-    this->origin_translation += shift3;
-    
+    // Shift is the vector from the center of the bottom face of the bounding box to the origin
+    Vec3d shift = -bb.center();
+    shift(2) = -bb.min(2);
+
+    this->translate(shift);
+    this->origin_translation += shift;
+
     if (!this->instances.empty()) {
         for (ModelInstance *i : this->instances) {
             // apply rotation and scaling to vector as well before translating instance,
             // in order to leave final position unaltered
-            Eigen::Rotation2Dd rot(i->rotation);
-            i->offset -= rot * shift2 * i->scaling_factor;
+            Vec3d i_shift = i->world_matrix(true) * shift;
+            i->offset -= to_2d(i_shift);
         }
         this->invalidate_bounding_box();
     }
@@ -861,12 +857,7 @@ void ModelObject::check_instances_print_volume_state(const BoundingBoxf3& print_
         {
             for (ModelInstance* inst : this->instances)
             {
-                Transform3d m = Transform3d::Identity();
-                m.translate(Vec3d(inst->offset(0), inst->offset(1), 0.0));
-                m.rotate(Eigen::AngleAxisd(inst->rotation, Vec3d::UnitZ()));
-                m.scale(inst->scaling_factor);
-
-                BoundingBoxf3 bb = vol->get_convex_hull().transformed_bounding_box(m);
+                BoundingBoxf3 bb = vol->get_convex_hull().transformed_bounding_box(inst->world_matrix());
 
                 if (print_volume.contains(bb))
                     inst->print_volume_state = ModelInstance::PVS_Inside;
@@ -995,26 +986,17 @@ size_t ModelVolume::split(unsigned int max_extruders)
 
 void ModelInstance::transform_mesh(TriangleMesh* mesh, bool dont_translate) const
 {
-    mesh->rotate_z(this->rotation);                 // rotate around mesh origin
-    mesh->scale(this->scaling_factor);              // scale around mesh origin
-    if (!dont_translate)
-        mesh->translate(this->offset(0), this->offset(1), 0);
+    mesh->transform(world_matrix(dont_translate).cast<float>());
 }
 
 BoundingBoxf3 ModelInstance::transform_mesh_bounding_box(const TriangleMesh* mesh, bool dont_translate) const
 {
     // Rotate around mesh origin.
-    double c = cos(this->rotation);
-    double s = sin(this->rotation);
-    BoundingBoxf3 bbox;
-    for (int i = 0; i < mesh->stl.stats.number_of_facets; ++ i) {
-        const stl_facet &facet = mesh->stl.facet_start[i];
-        for (int j = 0; j < 3; ++ j) {
-            const stl_vertex &v = facet.vertex[j];
-			bbox.merge(Vec3d(c * v(0) - s * v(1), s * v(0) + c * v(1), v(2)));
-        }
-    }
-    if (! empty(bbox)) {
+    TriangleMesh copy(*mesh);
+    copy.transform(world_matrix(true, false, true).cast<float>());
+    BoundingBoxf3 bbox = copy.bounding_box();
+
+    if (!empty(bbox)) {
         // Scale the bounding box uniformly.
         if (std::abs(this->scaling_factor - 1.) > EPSILON) {
             bbox.min *= this->scaling_factor;
@@ -1031,13 +1013,12 @@ BoundingBoxf3 ModelInstance::transform_mesh_bounding_box(const TriangleMesh* mes
 
 BoundingBoxf3 ModelInstance::transform_bounding_box(const BoundingBoxf3 &bbox, bool dont_translate) const
 {
-    Transform3d matrix = Transform3d::Identity();
-    if (!dont_translate)
-        matrix.translate(Vec3d(offset(0), offset(1), 0.0));
+    return bbox.transformed(world_matrix(dont_translate));
+}
 
-    matrix.rotate(Eigen::AngleAxisd(rotation, Vec3d::UnitZ()));
-    matrix.scale(scaling_factor);
-    return bbox.transformed(matrix);
+Vec3d ModelInstance::transform_vector(const Vec3d& v, bool dont_translate) const
+{
+    return world_matrix(dont_translate) * v;
 }
 
 void ModelInstance::transform_polygon(Polygon* polygon) const
@@ -1046,4 +1027,20 @@ void ModelInstance::transform_polygon(Polygon* polygon) const
     polygon->scale(this->scaling_factor);           // scale around polygon origin
 }
 
+Transform3d ModelInstance::world_matrix(bool dont_translate, bool dont_rotate, bool dont_scale) const
+{
+    Transform3d m = Transform3d::Identity();
+
+    if (!dont_translate)
+        m.translate(Vec3d(offset(0), offset(1), 0.0));
+
+    if (!dont_rotate)
+        m.rotate(Eigen::AngleAxisd(rotation, Vec3d::UnitZ()));
+
+    if (!dont_scale)
+        m.scale(scaling_factor);
+
+    return m;
+}
+
 }
diff --git a/xs/src/libslic3r/Model.hpp b/xs/src/libslic3r/Model.hpp
index f8a36527d..8a8af481c 100644
--- a/xs/src/libslic3r/Model.hpp
+++ b/xs/src/libslic3r/Model.hpp
@@ -224,7 +224,6 @@ public:
 
     friend class ModelObject;
 
-//    Transform3d     transform;
     double rotation;            // Rotation around the Z axis, in radians around mesh center point
     double scaling_factor;
     Vec2d offset;              // in unscaled coordinates
@@ -240,9 +239,13 @@ public:
     BoundingBoxf3 transform_mesh_bounding_box(const TriangleMesh* mesh, bool dont_translate = false) const;
     // Transform an external bounding box.
     BoundingBoxf3 transform_bounding_box(const BoundingBoxf3 &bbox, bool dont_translate = false) const;
+    // Transform an external vector.
+    Vec3d transform_vector(const Vec3d& v, bool dont_translate = false) const;
     // To be called on an external polygon. It does not translate the polygon, only rotates and scales.
     void transform_polygon(Polygon* polygon) const;
 
+    Transform3d world_matrix(bool dont_translate = false, bool dont_rotate = false, bool dont_scale = false) const;
+
     bool is_printable() const { return print_volume_state == PVS_Inside; }
 
 private:
diff --git a/xs/src/libslic3r/TriangleMesh.cpp b/xs/src/libslic3r/TriangleMesh.cpp
index 6840bc96e..6d40731f8 100644
--- a/xs/src/libslic3r/TriangleMesh.cpp
+++ b/xs/src/libslic3r/TriangleMesh.cpp
@@ -264,7 +264,7 @@ void TriangleMesh::rotate(float angle, const Vec3d& axis)
     Vec3f axis_norm = axis.cast<float>().normalized();
     Transform3f m = Transform3f::Identity();
     m.rotate(Eigen::AngleAxisf(angle, axis_norm));
-    stl_transform(&stl, (float*)m.data());
+    stl_transform(&stl, m);
 }
 
 void TriangleMesh::mirror(const Axis &axis)
@@ -279,6 +279,11 @@ void TriangleMesh::mirror(const Axis &axis)
     stl_invalidate_shared_vertices(&this->stl);
 }
 
+void TriangleMesh::transform(const Transform3f& t)
+{
+    stl_transform(&stl, t);
+}
+
 void TriangleMesh::align_to_origin()
 {
     this->translate(
@@ -523,9 +528,9 @@ BoundingBoxf3 TriangleMesh::transformed_bounding_box(const Transform3d& t) const
                 src_vertices(0, v_id) = (double)facet_ptr->vertex[i](0);
                 src_vertices(1, v_id) = (double)facet_ptr->vertex[i](1);
                 src_vertices(2, v_id) = (double)facet_ptr->vertex[i](2);
+                ++v_id;
             }
             facet_ptr += 1;
-            ++v_id;
         }
     }
 
diff --git a/xs/src/libslic3r/TriangleMesh.hpp b/xs/src/libslic3r/TriangleMesh.hpp
index 666252887..aebed4a2e 100644
--- a/xs/src/libslic3r/TriangleMesh.hpp
+++ b/xs/src/libslic3r/TriangleMesh.hpp
@@ -48,6 +48,7 @@ public:
     void mirror_x() { this->mirror(X); }
     void mirror_y() { this->mirror(Y); }
     void mirror_z() { this->mirror(Z); }
+    void transform(const Transform3f& t);
     void align_to_origin();
     void rotate(double angle, Point* center);
     TriangleMeshPtrs split() const;
diff --git a/xs/src/libslic3r/Utils.hpp b/xs/src/libslic3r/Utils.hpp
index 349222854..f1390b8a2 100644
--- a/xs/src/libslic3r/Utils.hpp
+++ b/xs/src/libslic3r/Utils.hpp
@@ -97,8 +97,9 @@ public:
     void call(int i) const;
     void call(int i, int j) const;
     void call(const std::vector<int>& ints) const;
-    void call(double d) const;
+    void call(double a) const;
     void call(double a, double b) const;
+    void call(double a, double b, double c) const;
     void call(double a, double b, double c, double d) const;
     void call(bool b) const;
 private:
diff --git a/xs/src/libslic3r/libslic3r.h b/xs/src/libslic3r/libslic3r.h
index 58208d116..925e93031 100644
--- a/xs/src/libslic3r/libslic3r.h
+++ b/xs/src/libslic3r/libslic3r.h
@@ -14,7 +14,7 @@
 #include <boost/thread.hpp>
 
 #define SLIC3R_FORK_NAME "Slic3r Prusa Edition"
-#define SLIC3R_VERSION "1.41.0-beta2"
+#define SLIC3R_VERSION "1.41.0"
 #define SLIC3R_BUILD "UNKNOWN"
 
 typedef int32_t coord_t;
diff --git a/xs/src/libslic3r/utils.cpp b/xs/src/libslic3r/utils.cpp
index 55164bbdd..95aaf5453 100644
--- a/xs/src/libslic3r/utils.cpp
+++ b/xs/src/libslic3r/utils.cpp
@@ -251,7 +251,7 @@ void PerlCallback::call(const std::vector<int>& ints) const
     LEAVE;
 }
 
-void PerlCallback::call(double d) const
+void PerlCallback::call(double a) const
 {
     if (!m_callback)
         return;
@@ -259,7 +259,7 @@ void PerlCallback::call(double d) const
     ENTER;
     SAVETMPS;
     PUSHMARK(SP);
-    XPUSHs(sv_2mortal(newSVnv(d)));
+    XPUSHs(sv_2mortal(newSVnv(a)));
     PUTBACK;
     perl_call_sv(SvRV((SV*)m_callback), G_DISCARD);
     FREETMPS;
@@ -282,6 +282,23 @@ void PerlCallback::call(double a, double b) const
     LEAVE;
 }
 
+void PerlCallback::call(double a, double b, double c) const
+{
+    if (!m_callback)
+        return;
+    dSP;
+    ENTER;
+    SAVETMPS;
+    PUSHMARK(SP);
+    XPUSHs(sv_2mortal(newSVnv(a)));
+    XPUSHs(sv_2mortal(newSVnv(b)));
+    XPUSHs(sv_2mortal(newSVnv(c)));
+    PUTBACK;
+    perl_call_sv(SvRV((SV*)m_callback), G_DISCARD);
+    FREETMPS;
+    LEAVE;
+}
+
 void PerlCallback::call(double a, double b, double c, double d) const
 {
     if (!m_callback)
diff --git a/xs/src/slic3r/GUI/3DScene.cpp b/xs/src/slic3r/GUI/3DScene.cpp
index 08a1b1457..57639fed0 100644
--- a/xs/src/slic3r/GUI/3DScene.cpp
+++ b/xs/src/slic3r/GUI/3DScene.cpp
@@ -195,9 +195,9 @@ const float GLVolume::OUTSIDE_COLOR[4] = { 0.0f, 0.38f, 0.8f, 1.0f };
 const float GLVolume::SELECTED_OUTSIDE_COLOR[4] = { 0.19f, 0.58f, 1.0f, 1.0f };
 
 GLVolume::GLVolume(float r, float g, float b, float a)
-    : m_origin(0, 0, 0)
-    , m_angle_z(0.0f)
-    , m_scale_factor(1.0f)
+    : m_offset(Vec3d::Zero())
+    , m_rotation(0.0)
+    , m_scaling_factor(1.0)
     , m_world_matrix(Transform3f::Identity())
     , m_world_matrix_dirty(true)
     , m_transformed_bounding_box_dirty(true)
@@ -255,43 +255,43 @@ void GLVolume::set_render_color()
         set_render_color(color, 4);
 }
 
-const Vec3d& GLVolume::get_origin() const
+double GLVolume::get_rotation()
 {
-    return m_origin;
+    return m_rotation;
 }
 
-float GLVolume::get_angle_z()
+void GLVolume::set_rotation(double rotation)
 {
-    return m_angle_z;
-}
-
-void GLVolume::set_origin(const Vec3d& origin)
-{
-    if (m_origin != origin)
+    if (m_rotation != rotation)
     {
-        m_origin = origin;
+        m_rotation = rotation;
         m_world_matrix_dirty = true;
         m_transformed_bounding_box_dirty = true;
         m_transformed_convex_hull_bounding_box_dirty = true;
     }
 }
 
-void GLVolume::set_angle_z(float angle_z)
+const Vec3d& GLVolume::get_offset() const
 {
-    if (m_angle_z != angle_z)
+    return m_offset;
+}
+
+void GLVolume::set_offset(const Vec3d& offset)
+{
+    if (m_offset != offset)
     {
-        m_angle_z = angle_z;
+        m_offset = offset;
         m_world_matrix_dirty = true;
         m_transformed_bounding_box_dirty = true;
         m_transformed_convex_hull_bounding_box_dirty = true;
     }
 }
 
-void GLVolume::set_scale_factor(float scale_factor)
+void GLVolume::set_scaling_factor(double factor)
 {
-    if (m_scale_factor != scale_factor)
+    if (m_scaling_factor != factor)
     {
-        m_scale_factor = scale_factor;
+        m_scaling_factor = factor;
         m_world_matrix_dirty = true;
         m_transformed_bounding_box_dirty = true;
         m_transformed_convex_hull_bounding_box_dirty = true;
@@ -303,14 +303,24 @@ void GLVolume::set_convex_hull(const TriangleMesh& convex_hull)
     m_convex_hull = &convex_hull;
 }
 
+void GLVolume::set_select_group_id(const std::string& select_by)
+{
+    if (select_by == "object")
+        select_group_id = object_idx() * 1000000;
+    else if (select_by == "volume")
+        select_group_id = object_idx() * 1000000 + volume_idx() * 1000;
+    else if (select_by == "instance")
+        select_group_id = composite_id;
+}
+
 const Transform3f& GLVolume::world_matrix() const
 {
     if (m_world_matrix_dirty)
     {
         m_world_matrix = Transform3f::Identity();
-        m_world_matrix.translate(Vec3f((float)m_origin(0), (float)m_origin(1), (float)m_origin(2)));
-        m_world_matrix.rotate(Eigen::AngleAxisf(m_angle_z, Vec3f::UnitZ()));
-        m_world_matrix.scale(m_scale_factor);
+        m_world_matrix.translate(m_offset.cast<float>());
+        m_world_matrix.rotate(Eigen::AngleAxisf((float)m_rotation, Vec3f::UnitZ()));
+        m_world_matrix.scale((float)m_scaling_factor);
         m_world_matrix_dirty = false;
     }
     return m_world_matrix;
@@ -384,9 +394,9 @@ void GLVolume::render() const
 
     ::glCullFace(GL_BACK);
     ::glPushMatrix();
-    ::glTranslated(m_origin(0), m_origin(1), m_origin(2));
-    ::glRotatef(m_angle_z * 180.0f / PI, 0.0f, 0.0f, 1.0f);
-    ::glScalef(m_scale_factor, m_scale_factor, m_scale_factor);
+    ::glTranslated(m_offset(0), m_offset(1), m_offset(2));
+    ::glRotated(m_rotation * 180.0 / (double)PI, 0.0, 0.0, 1.0);
+    ::glScaled(m_scaling_factor, m_scaling_factor, m_scaling_factor);
     if (this->indexed_vertex_array.indexed())
         this->indexed_vertex_array.render(this->tverts_range, this->qverts_range);
     else
@@ -510,9 +520,9 @@ void GLVolume::render_VBOs(int color_id, int detection_id, int worldmatrix_id) c
     ::glNormalPointer(GL_FLOAT, 6 * sizeof(float), nullptr);
 
     ::glPushMatrix();
-    ::glTranslated(m_origin(0), m_origin(1), m_origin(2));
-    ::glRotatef(m_angle_z * 180.0f / PI, 0.0f, 0.0f, 1.0f);
-    ::glScalef(m_scale_factor, m_scale_factor, m_scale_factor);
+    ::glTranslated(m_offset(0), m_offset(1), m_offset(2));
+    ::glRotated(m_rotation * 180.0 / (double)PI, 0.0, 0.0, 1.0);
+    ::glScaled(m_scaling_factor, m_scaling_factor, m_scaling_factor);
 
     if (n_triangles > 0)
     {
@@ -555,9 +565,9 @@ void GLVolume::render_legacy() const
     ::glNormalPointer(GL_FLOAT, 6 * sizeof(float), indexed_vertex_array.vertices_and_normals_interleaved.data());
 
     ::glPushMatrix();
-    ::glTranslated(m_origin(0), m_origin(1), m_origin(2));
-    ::glRotatef(m_angle_z * 180.0f / PI, 0.0f, 0.0f, 1.0f);
-    ::glScalef(m_scale_factor, m_scale_factor, m_scale_factor);
+    ::glTranslated(m_offset(0), m_offset(1), m_offset(2));
+    ::glRotated(m_rotation * 180.0 / (double)PI, 0.0, 0.0, 1.0);
+    ::glScaled(m_scaling_factor, m_scaling_factor, m_scaling_factor);
 
     if (n_triangles > 0)
         ::glDrawElements(GL_TRIANGLES, n_triangles, GL_UNSIGNED_INT, indexed_vertex_array.triangle_indices.data() + tverts_range.first);
@@ -655,12 +665,7 @@ std::vector<int> GLVolumeCollection::load_object(
             v.bounding_box = v.indexed_vertex_array.bounding_box();
             v.indexed_vertex_array.finalize_geometry(use_VBOs);
             v.composite_id = obj_idx * 1000000 + volume_idx * 1000 + instance_idx;
-            if (select_by == "object")
-                v.select_group_id = obj_idx * 1000000;
-            else if (select_by == "volume")
-                v.select_group_id = obj_idx * 1000000 + volume_idx * 1000;
-            else if (select_by == "instance")
-                v.select_group_id = v.composite_id;
+            v.set_select_group_id(select_by);
             if (drag_by == "object")
                 v.drag_group_id = obj_idx * 1000;
             else if (drag_by == "instance")
@@ -675,9 +680,9 @@ std::vector<int> GLVolumeCollection::load_object(
             }
             v.is_modifier = model_volume->modifier;
             v.shader_outside_printer_detection_enabled = !model_volume->modifier;
-            v.set_origin(Vec3d(instance->offset(0), instance->offset(1), 0.0));
-            v.set_angle_z(instance->rotation);
-            v.set_scale_factor(instance->scaling_factor);
+            v.set_offset(Vec3d(instance->offset(0), instance->offset(1), 0.0));
+            v.set_rotation(instance->rotation);
+            v.set_scaling_factor(instance->scaling_factor);
         }
     }
     
@@ -746,7 +751,7 @@ int GLVolumeCollection::load_wipe_tower_preview(
     else
         v.indexed_vertex_array.load_mesh_flat_shading(mesh);
 
-    v.set_origin(Vec3d(pos_x, pos_y, 0.));
+    v.set_offset(Vec3d(pos_x, pos_y, 0.0));
 
     // finalize_geometry() clears the vertex arrays, therefore the bounding box has to be computed before finalize_geometry().
     v.bounding_box = v.indexed_vertex_array.bounding_box();
@@ -949,6 +954,15 @@ void GLVolumeCollection::update_colors_by_extruder(const DynamicPrintConfig* con
     }
 }
 
+void GLVolumeCollection::set_select_by(const std::string& select_by)
+{
+    for (GLVolume *vol : this->volumes)
+    {
+        if (vol != nullptr)
+            vol->set_select_group_id(select_by);
+    }
+}
+
 std::vector<double> GLVolumeCollection::get_current_print_zs(bool active_only) const
 {
     // Collect layer top positions of all volumes.
@@ -1190,7 +1204,7 @@ static void thick_lines_to_indexed_vertex_array(
         b1_prev = b1;
         v_prev = v;
 
-        if (bottom_z_different)
+        if (bottom_z_different && (closed || (!is_first && !is_last)))
         {
             // Found a change of the layer thickness -> Add a cap at the beginning of this segment.
             volume.push_quad(idx_a[BOTTOM], idx_a[RIGHT], idx_a[TOP], idx_a[LEFT]);
@@ -1198,10 +1212,10 @@ static void thick_lines_to_indexed_vertex_array(
 
         if (! closed) {
             // Terminate open paths with caps.
-            if (is_first && !bottom_z_different)
+            if (is_first)
                 volume.push_quad(idx_a[BOTTOM], idx_a[RIGHT], idx_a[TOP], idx_a[LEFT]);
             // We don't use 'else' because both cases are true if we have only one line.
-            if (is_last && !bottom_z_different)
+            if (is_last)
                 volume.push_quad(idx_b[BOTTOM], idx_b[LEFT], idx_b[TOP], idx_b[RIGHT]);
         }
 
@@ -1772,12 +1786,12 @@ void _3DScene::set_model(wxGLCanvas* canvas, Model* model)
 
 void _3DScene::set_bed_shape(wxGLCanvas* canvas, const Pointfs& shape)
 {
-    return s_canvas_mgr.set_bed_shape(canvas, shape);
+    s_canvas_mgr.set_bed_shape(canvas, shape);
 }
 
 void _3DScene::set_auto_bed_shape(wxGLCanvas* canvas)
 {
-    return s_canvas_mgr.set_auto_bed_shape(canvas);
+    s_canvas_mgr.set_auto_bed_shape(canvas);
 }
 
 BoundingBoxf3 _3DScene::get_volumes_bounding_box(wxGLCanvas* canvas)
@@ -1792,22 +1806,27 @@ void _3DScene::set_axes_length(wxGLCanvas* canvas, float length)
 
 void _3DScene::set_cutting_plane(wxGLCanvas* canvas, float z, const ExPolygons& polygons)
 {
-    return s_canvas_mgr.set_cutting_plane(canvas, z, polygons);
+    s_canvas_mgr.set_cutting_plane(canvas, z, polygons);
 }
 
 void _3DScene::set_color_by(wxGLCanvas* canvas, const std::string& value)
 {
-    return s_canvas_mgr.set_color_by(canvas, value);
+    s_canvas_mgr.set_color_by(canvas, value);
 }
 
 void _3DScene::set_select_by(wxGLCanvas* canvas, const std::string& value)
 {
-    return s_canvas_mgr.set_select_by(canvas, value);
+    s_canvas_mgr.set_select_by(canvas, value);
 }
 
 void _3DScene::set_drag_by(wxGLCanvas* canvas, const std::string& value)
 {
-    return s_canvas_mgr.set_drag_by(canvas, value);
+    s_canvas_mgr.set_drag_by(canvas, value);
+}
+
+std::string _3DScene::get_select_by(wxGLCanvas* canvas)
+{
+    return s_canvas_mgr.get_select_by(canvas);
 }
 
 bool _3DScene::is_layers_editing_enabled(wxGLCanvas* canvas)
@@ -2080,6 +2099,11 @@ void _3DScene::register_action_layersediting_callback(wxGLCanvas* canvas, void*
     s_canvas_mgr.register_action_layersediting_callback(canvas, callback);
 }
 
+void _3DScene::register_action_selectbyparts_callback(wxGLCanvas* canvas, void* callback)
+{
+    s_canvas_mgr.register_action_selectbyparts_callback(canvas, callback);
+}
+
 static inline int hex_digit_to_int(const char c)
 {
     return 
@@ -2117,6 +2141,11 @@ std::vector<int> _3DScene::load_object(wxGLCanvas* canvas, const Model* model, i
     return s_canvas_mgr.load_object(canvas, model, obj_idx);
 }
 
+int _3DScene::get_first_volume_id(wxGLCanvas* canvas, int obj_idx)
+{
+    return s_canvas_mgr.get_first_volume_id(canvas, obj_idx);
+}
+
 void _3DScene::reload_scene(wxGLCanvas* canvas, bool force)
 {
     s_canvas_mgr.reload_scene(canvas, force);
diff --git a/xs/src/slic3r/GUI/3DScene.hpp b/xs/src/slic3r/GUI/3DScene.hpp
index 69f1e1d35..ec9d1a501 100644
--- a/xs/src/slic3r/GUI/3DScene.hpp
+++ b/xs/src/slic3r/GUI/3DScene.hpp
@@ -255,11 +255,11 @@ public:
 
 private:
     // Offset of the volume to be rendered.
-    Vec3d                 m_origin;
+    Vec3d                 m_offset;
     // Rotation around Z axis of the volume to be rendered.
-    float                 m_angle_z;
+    double                m_rotation;
     // Scale factor of the volume to be rendered.
-    float                 m_scale_factor;
+    double                m_scaling_factor;
     // World matrix of the volume to be rendered.
     mutable Transform3f   m_world_matrix;
     // Whether or not is needed to recalculate the world matrix.
@@ -327,13 +327,18 @@ public:
     // Sets render color in dependence of current state
     void set_render_color();
 
-    float get_angle_z();
-    const Vec3d& get_origin() const;
-    void set_origin(const Vec3d& origin);
-    void set_angle_z(float angle_z);
-    void set_scale_factor(float scale_factor);
+    double get_rotation();
+    void set_rotation(double rotation);
+
+    const Vec3d& get_offset() const;
+    void set_offset(const Vec3d& offset);
+
+    void set_scaling_factor(double factor);
+
     void set_convex_hull(const TriangleMesh& convex_hull);
 
+    void set_select_group_id(const std::string& select_by);
+
     int                 object_idx() const { return this->composite_id / 1000000; }
     int                 volume_idx() const { return (this->composite_id / 1000) % 1000; }
     int                 instance_idx() const { return this->composite_id % 1000; }
@@ -443,6 +448,8 @@ public:
 
     void update_colors_by_extruder(const DynamicPrintConfig* config);
 
+    void set_select_by(const std::string& select_by);
+
     // Returns a vector containing the sorted list of all the print_zs of the volumes contained in this collection
     std::vector<double> get_current_print_zs(bool active_only) const;
 
@@ -496,6 +503,8 @@ public:
     static void set_select_by(wxGLCanvas* canvas, const std::string& value);
     static void set_drag_by(wxGLCanvas* canvas, const std::string& value);
 
+    static std::string get_select_by(wxGLCanvas* canvas);
+
     static bool is_layers_editing_enabled(wxGLCanvas* canvas);
     static bool is_layers_editing_allowed(wxGLCanvas* canvas);
     static bool is_shader_enabled(wxGLCanvas* canvas);
@@ -559,10 +568,13 @@ public:
     static void register_action_cut_callback(wxGLCanvas* canvas, void* callback);
     static void register_action_settings_callback(wxGLCanvas* canvas, void* callback);
     static void register_action_layersediting_callback(wxGLCanvas* canvas, void* callback);
+    static void register_action_selectbyparts_callback(wxGLCanvas* canvas, void* callback);
 
     static std::vector<int> load_object(wxGLCanvas* canvas, const ModelObject* model_object, int obj_idx, std::vector<int> instance_idxs);
     static std::vector<int> load_object(wxGLCanvas* canvas, const Model* model, int obj_idx);
 
+    static int get_first_volume_id(wxGLCanvas* canvas, int obj_idx);
+
     static void reload_scene(wxGLCanvas* canvas, bool force);
 
     static void load_gcode_preview(wxGLCanvas* canvas, const GCodePreviewData* preview_data, const std::vector<std::string>& str_tool_colors);
diff --git a/xs/src/slic3r/GUI/Field.cpp b/xs/src/slic3r/GUI/Field.cpp
index 4043a4457..f143e8bc6 100644
--- a/xs/src/slic3r/GUI/Field.cpp
+++ b/xs/src/slic3r/GUI/Field.cpp
@@ -228,24 +228,20 @@ namespace Slic3r { namespace GUI {
 		}), temp->GetId());
 #endif // __WXGTK__
 
-		temp->Bind(wxEVT_TEXT, ([this](wxCommandEvent)
+		temp->Bind(wxEVT_TEXT, ([this](wxCommandEvent& evt)
 		{
 #ifdef __WXGTK__
-			bChangedValueEvent = true;
-#else
-			on_change_field();
+			if (bChangedValueEvent)
 #endif //__WXGTK__
+			on_change_field();
 		}), temp->GetId());
 
 #ifdef __WXGTK__
-		temp->Bind(wxEVT_KEY_UP, [this](wxKeyEvent& event)
-		{
-			if (bChangedValueEvent)	{
-				on_change_field();
-				bChangedValueEvent = false;
-			}
-			event.Skip();
-		});
+        // to correct value updating on GTK we should:
+        // call on_change_field() on wxEVT_KEY_UP instead of wxEVT_TEXT
+        // and prevent value updating on wxEVT_KEY_DOWN
+        temp->Bind(wxEVT_KEY_DOWN, &TextCtrl::change_field_value, this);
+        temp->Bind(wxEVT_KEY_UP, &TextCtrl::change_field_value, this);
 #endif //__WXGTK__
 
 		// select all text using Ctrl+A
@@ -271,6 +267,15 @@ namespace Slic3r { namespace GUI {
 	void TextCtrl::enable() { dynamic_cast<wxTextCtrl*>(window)->Enable(); dynamic_cast<wxTextCtrl*>(window)->SetEditable(true); }
     void TextCtrl::disable() { dynamic_cast<wxTextCtrl*>(window)->Disable(); dynamic_cast<wxTextCtrl*>(window)->SetEditable(false); }
 
+#ifdef __WXGTK__
+    void TextCtrl::change_field_value(wxEvent& event)
+    {
+    	if (bChangedValueEvent = event.GetEventType()==wxEVT_KEY_UP)
+    		on_change_field();
+        event.Skip();
+    };
+#endif //__WXGTK__
+
 void CheckBox::BUILD() {
 	auto size = wxSize(wxDefaultSize);
 	if (m_opt.height >= 0) size.SetHeight(m_opt.height);
diff --git a/xs/src/slic3r/GUI/Field.hpp b/xs/src/slic3r/GUI/Field.hpp
index e305f1e53..c38658e2b 100644
--- a/xs/src/slic3r/GUI/Field.hpp
+++ b/xs/src/slic3r/GUI/Field.hpp
@@ -235,7 +235,8 @@ inline bool is_sizer_field(const t_field& obj) { return !is_bad_field(obj) && ob
 class TextCtrl : public Field {
     using Field::Field;
 #ifdef __WXGTK__
-	bool	bChangedValueEvent = false;
+	bool	bChangedValueEvent = true;
+    void    change_field_value(wxEvent& event);
 #endif //__WXGTK__
 public:
 	TextCtrl(const ConfigOptionDef& opt, const t_config_option_key& id) : Field(opt,  id) {}
diff --git a/xs/src/slic3r/GUI/GLCanvas3D.cpp b/xs/src/slic3r/GUI/GLCanvas3D.cpp
index bbc73b896..161ce89da 100644
--- a/xs/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/xs/src/slic3r/GUI/GLCanvas3D.cpp
@@ -1320,16 +1320,6 @@ void GLCanvas3D::Gizmos::update(const Linef3& mouse_ray)
         curr->update(mouse_ray);
 }
 
-void GLCanvas3D::Gizmos::refresh()
-{
-    if (!m_enabled)
-        return;
-
-    GLGizmoBase* curr = _get_current();
-    if (curr != nullptr)
-        curr->refresh();
-}
-
 GLCanvas3D::Gizmos::EType GLCanvas3D::Gizmos::get_current_type() const
 {
     return m_current;
@@ -1349,12 +1339,12 @@ bool GLCanvas3D::Gizmos::is_dragging() const
     return m_dragging;
 }
 
-void GLCanvas3D::Gizmos::start_dragging()
+void GLCanvas3D::Gizmos::start_dragging(const BoundingBoxf3& box)
 {
     m_dragging = true;
     GLGizmoBase* curr = _get_current();
     if (curr != nullptr)
-        curr->start_dragging();
+        curr->start_dragging(box);
 }
 
 void GLCanvas3D::Gizmos::stop_dragging()
@@ -2018,6 +2008,9 @@ void GLCanvas3D::update_volumes_selection(const std::vector<int>& selections)
     if (m_model == nullptr)
         return;
 
+    if (selections.empty())
+        return;
+
     for (unsigned int obj_idx = 0; obj_idx < (unsigned int)m_model->objects.size(); ++obj_idx)
     {
         if ((selections[obj_idx] == 1) && (obj_idx < (unsigned int)m_objects_volumes_idxs.size()))
@@ -2144,6 +2137,7 @@ void GLCanvas3D::set_color_by(const std::string& value)
 void GLCanvas3D::set_select_by(const std::string& value)
 {
     m_select_by = value;
+    m_volumes.set_select_by(value);
 }
 
 void GLCanvas3D::set_drag_by(const std::string& value)
@@ -2151,6 +2145,11 @@ void GLCanvas3D::set_drag_by(const std::string& value)
     m_drag_by = value;
 }
 
+const std::string& GLCanvas3D::get_select_by() const
+{
+    return m_select_by;
+}
+
 float GLCanvas3D::get_camera_zoom() const
 {
     return m_camera.zoom;
@@ -2432,6 +2431,17 @@ std::vector<int> GLCanvas3D::load_object(const Model& model, int obj_idx)
     return std::vector<int>();
 }
 
+int GLCanvas3D::get_first_volume_id(int obj_idx) const
+{
+    for (int i = 0; i < (int)m_volumes.volumes.size(); ++i)
+    {
+        if ((m_volumes.volumes[i] != nullptr) && (m_volumes.volumes[i]->object_idx() == obj_idx))
+            return i;
+    }
+
+    return -1;
+}
+
 void GLCanvas3D::reload_scene(bool force)
 {
     if ((m_canvas == nullptr) || (m_config == nullptr) || (m_model == nullptr))
@@ -2467,8 +2477,6 @@ void GLCanvas3D::reload_scene(bool force)
     if (!m_objects_selections.empty())
         update_gizmos_data();
 
-    m_gizmos.refresh();
-
     if (m_config->has("nozzle_diameter"))
     {
         // Should the wipe tower be visualized ?
@@ -2757,6 +2765,12 @@ void GLCanvas3D::register_action_layersediting_callback(void* callback)
         m_action_layersediting_callback.register_callback(callback);
 }
 
+void GLCanvas3D::register_action_selectbyparts_callback(void* callback)
+{
+    if (callback != nullptr)
+        m_action_selectbyparts_callback.register_callback(callback);
+}
+
 void GLCanvas3D::bind_event_handlers()
 {
     if (m_canvas != nullptr)
@@ -2952,7 +2966,7 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
         m_mouse.position = Vec2d(-1.0, -1.0);
         m_dirty = true;
     }
-    else if (evt.LeftDClick() && (m_hover_volume_id != -1))
+    else if (evt.LeftDClick() && (m_hover_volume_id != -1) && !gizmos_overlay_contains_mouse && (toolbar_contains_mouse == -1))
         m_on_double_click_callback.call();
     else if (evt.LeftDClick() && (toolbar_contains_mouse != -1))
     {
@@ -2993,15 +3007,15 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
         else if ((selected_object_idx != -1) && m_gizmos.grabber_contains_mouse())
         {
             update_gizmos_data();
-            m_gizmos.start_dragging();
+            m_gizmos.start_dragging(_selected_volumes_bounding_box());
             m_mouse.drag.gizmo_volume_idx = _get_first_selected_volume_id(selected_object_idx);
 
             if (m_gizmos.get_current_type() == Gizmos::Flatten) {
                 // Rotate the object so the normal points downward:
                 Vec3d normal = m_gizmos.get_flattening_normal();
-                if (normal != Vec3d::Zero()) {
-                    Vec3d axis = normal(2) > 0.999f ? Vec3d::UnitX() : normal.cross(-Vec3d::UnitZ());
-                    float angle = -acos(-normal(2));
+                if (normal(0) != 0.0 || normal(1) != 0.0 || normal(2) != 0.0) {
+                    Vec3d axis = normal(2) > 0.999 ? Vec3d::UnitX() : normal.cross(-Vec3d::UnitZ()).normalized();
+                    float angle = acos(clamp(-1.0, 1.0, -normal(2)));
                     m_on_gizmo_rotate_callback.call(angle, (float)axis(0), (float)axis(1), (float)axis(2));
                 }
             }
@@ -3036,14 +3050,13 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
                     }
 
                     update_gizmos_data();
-                    m_gizmos.refresh();
                     m_dirty = true;
                 }
             }
 
             // propagate event through callback
             if (m_picking_enabled && (volume_idx != -1))
-                _on_select(volume_idx);
+                _on_select(volume_idx, selected_object_idx);
 
             if (volume_idx != -1)
             {
@@ -3126,10 +3139,12 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
 
         // Apply new temporary volume origin and ignore Z.
         for (GLVolume* v : volumes)
-            v->set_origin(v->get_origin() + Vec3d(vector(0), vector(1), 0.0));
+        {
+            v->set_offset(v->get_offset() + Vec3d(vector(0), vector(1), 0.0));
+        }
 
+        update_position_values(volume->get_offset());
         m_mouse.drag.start_position_3D = cur_pos;
-        m_gizmos.refresh();
 
         m_dirty = true;
     }
@@ -3166,7 +3181,8 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
             float scale_factor = m_gizmos.get_scale();
             for (GLVolume* v : volumes)
             {
-                v->set_scale_factor(scale_factor);
+                v->set_scaling_factor((double)scale_factor);
+                update_scale_values((double)scale_factor);
             }
             break;
         }
@@ -3176,7 +3192,8 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
             float angle_z = m_gizmos.get_angle_z();
             for (GLVolume* v : volumes)
             {
-                v->set_angle_z(angle_z);
+                v->set_rotation((double)angle_z);
+                update_rotation_value((double)angle_z, Z);
             }
             break;
         }
@@ -3193,13 +3210,8 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
             }
             const Vec3d& size = bb.size();
             m_on_update_geometry_info_callback.call(size(0), size(1), size(2), m_gizmos.get_scale());
-            update_scale_values(size, m_gizmos.get_scale());
-            update_rotation_value(volumes[0]->get_angle_z(), "z");
         }
 
-        if ((m_gizmos.get_current_type() != Gizmos::Rotate) && (volumes.size() > 1))
-            m_gizmos.refresh();
-
         m_dirty = true;
     }
     else if (evt.Dragging() && !gizmos_overlay_contains_mouse)
@@ -3284,7 +3296,7 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
             if (m_picking_enabled && !m_toolbar_action_running)
             {
                 deselect_volumes();
-                _on_select(-1);
+                _on_select(-1, -1);
                 update_gizmos_data();
             }
         }
@@ -3295,7 +3307,6 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
             case Gizmos::Scale:
             {
                 m_on_gizmo_scale_uniformly_callback.call((double)m_gizmos.get_scale());
-                Slic3r::GUI::update_settings_value();
                 break;
             }
             case Gizmos::Rotate:
@@ -3307,6 +3318,7 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
                 break;
             }
             m_gizmos.stop_dragging();
+            Slic3r::GUI::update_settings_value();
         }
 
         m_mouse.drag.move_volume_idx = -1;
@@ -3509,6 +3521,17 @@ bool GLCanvas3D::_init_toolbar()
     if (!m_toolbar.add_item(item))
         return false;
 
+    if (!m_toolbar.add_separator())
+        return false;
+
+    item.name = "selectbyparts";
+    item.tooltip = GUI::L_str("Select by parts");
+    item.sprite_id = 10;
+    item.is_toggable = true;
+    item.action_callback = &m_action_selectbyparts_callback;
+    if (!m_toolbar.add_item(item))
+        return false;
+
     enable_toolbar_item("add", true);
 
     return true;
@@ -3748,6 +3771,7 @@ void GLCanvas3D::_deregister_callbacks()
     m_action_cut_callback.deregister_callback();
     m_action_settings_callback.deregister_callback();
     m_action_layersediting_callback.deregister_callback();
+    m_action_selectbyparts_callback.deregister_callback();
 }
 
 void GLCanvas3D::_mark_volumes_for_layer_height() const
@@ -5219,7 +5243,7 @@ void GLCanvas3D::_on_move(const std::vector<int>& volume_idxs)
 
     std::set<std::string> done;  // prevent moving instances twice
     bool object_moved = false;
-    Vec3d wipe_tower_origin(0.0, 0.0, 0.0);
+    Vec3d wipe_tower_origin = Vec3d::Zero();
     for (int volume_idx : volume_idxs)
     {
         GLVolume* volume = m_volumes.volumes[volume_idx];
@@ -5238,34 +5262,56 @@ void GLCanvas3D::_on_move(const std::vector<int>& volume_idxs)
         {
             // Move a regular object.
             ModelObject* model_object = m_model->objects[obj_idx];
-            const Vec3d& origin = volume->get_origin();
-            model_object->instances[instance_idx]->offset = Vec2d(origin(0), origin(1));
-            model_object->invalidate_bounding_box();
-            object_moved = true;
+            if (model_object != nullptr)
+            {
+                const Vec3d& offset = volume->get_offset();
+                model_object->instances[instance_idx]->offset = Vec2d(offset(0), offset(1));
+                model_object->invalidate_bounding_box();
+                update_position_values();
+                object_moved = true;
+            }
         }
         else if (obj_idx == 1000)
             // Move a wipe tower proxy.
-            wipe_tower_origin = volume->get_origin();
+            wipe_tower_origin = volume->get_offset();
     }
 
     if (object_moved)
         m_on_instance_moved_callback.call();
 
-    if (wipe_tower_origin != Vec3d(0.0, 0.0, 0.0))
+    if (wipe_tower_origin != Vec3d::Zero())
         m_on_wipe_tower_moved_callback.call(wipe_tower_origin(0), wipe_tower_origin(1));
 }
 
-void GLCanvas3D::_on_select(int volume_idx)
+void GLCanvas3D::_on_select(int volume_idx, int object_idx)
 {
-    int id = -1;
+    int vol_id = -1;
+    int obj_id = -1;
+
     if ((volume_idx != -1) && (volume_idx < (int)m_volumes.volumes.size()))
     {
         if (m_select_by == "volume")
-            id = m_volumes.volumes[volume_idx]->volume_idx();
+        {
+            if (m_volumes.volumes[volume_idx]->object_idx() != object_idx)
+            {
+                set_select_by("object");
+                obj_id = m_volumes.volumes[volume_idx]->object_idx();
+                vol_id = -1;
+            }
+            else
+            {
+                obj_id = object_idx;
+                vol_id = m_volumes.volumes[volume_idx]->volume_idx();
+            }
+        }
         else if (m_select_by == "object")
-            id = m_volumes.volumes[volume_idx]->object_idx();
+        {
+            obj_id = m_volumes.volumes[volume_idx]->object_idx();
+            vol_id = -1;
+        }
     }
-    m_on_select_object_callback.call(id);
+
+    m_on_select_object_callback.call(obj_id, vol_id);
 }
 
 std::vector<float> GLCanvas3D::_parse_colors(const std::vector<std::string>& colors)
diff --git a/xs/src/slic3r/GUI/GLCanvas3D.hpp b/xs/src/slic3r/GUI/GLCanvas3D.hpp
index 2969d12c6..c5b4581fa 100644
--- a/xs/src/slic3r/GUI/GLCanvas3D.hpp
+++ b/xs/src/slic3r/GUI/GLCanvas3D.hpp
@@ -367,14 +367,13 @@ public:
         bool overlay_contains_mouse(const GLCanvas3D& canvas, const Vec2d& mouse_pos) const;
         bool grabber_contains_mouse() const;
         void update(const Linef3& mouse_ray);
-        void refresh();
 
         EType get_current_type() const;
 
         bool is_running() const;
 
         bool is_dragging() const;
-        void start_dragging();
+        void start_dragging(const BoundingBoxf3& box);
         void stop_dragging();
 
         float get_scale() const;
@@ -514,6 +513,7 @@ private:
     PerlCallback m_action_cut_callback;
     PerlCallback m_action_settings_callback;
     PerlCallback m_action_layersediting_callback;
+    PerlCallback m_action_selectbyparts_callback;
 
 public:
     GLCanvas3D(wxGLCanvas* canvas);
@@ -556,6 +556,8 @@ public:
     void set_select_by(const std::string& value);
     void set_drag_by(const std::string& value);
 
+    const std::string& get_select_by() const;
+
     float get_camera_zoom() const;
 
     BoundingBoxf3 volumes_bounding_box() const;
@@ -597,6 +599,8 @@ public:
     std::vector<int> load_object(const ModelObject& model_object, int obj_idx, std::vector<int> instance_idxs);
     std::vector<int> load_object(const Model& model, int obj_idx);
 
+    int get_first_volume_id(int obj_idx) const;
+
     void reload_scene(bool force);
 
     void load_gcode_preview(const GCodePreviewData& preview_data, const std::vector<std::string>& str_tool_colors);
@@ -631,6 +635,7 @@ public:
     void register_action_cut_callback(void* callback);
     void register_action_settings_callback(void* callback);
     void register_action_layersediting_callback(void* callback);
+    void register_action_selectbyparts_callback(void* callback);
 
     void bind_event_handlers();
     void unbind_event_handlers();
@@ -733,7 +738,7 @@ private:
     void _show_warning_texture_if_needed();
 
     void _on_move(const std::vector<int>& volume_idxs);
-    void _on_select(int volume_idx);
+    void _on_select(int volume_idx, int object_idx);
 
     // generates the legend texture in dependence of the current shown view type
     void _generate_legend_texture(const GCodePreviewData& preview_data, const std::vector<float>& tool_colors);
diff --git a/xs/src/slic3r/GUI/GLCanvas3DManager.cpp b/xs/src/slic3r/GUI/GLCanvas3DManager.cpp
index 57a49d7ab..a09d83b89 100644
--- a/xs/src/slic3r/GUI/GLCanvas3DManager.cpp
+++ b/xs/src/slic3r/GUI/GLCanvas3DManager.cpp
@@ -338,6 +338,12 @@ void GLCanvas3DManager::set_drag_by(wxGLCanvas* canvas, const std::string& value
         it->second->set_drag_by(value);
 }
 
+std::string GLCanvas3DManager::get_select_by(wxGLCanvas* canvas) const
+{
+    CanvasesMap::const_iterator it = _get_canvas(canvas);
+    return (it != m_canvases.end()) ? it->second->get_select_by() : "";
+}
+
 bool GLCanvas3DManager::is_layers_editing_enabled(wxGLCanvas* canvas) const
 {
     CanvasesMap::const_iterator it = _get_canvas(canvas);
@@ -536,6 +542,12 @@ std::vector<int> GLCanvas3DManager::load_object(wxGLCanvas* canvas, const Model*
     return (it != m_canvases.end()) ? it->second->load_object(*model, obj_idx) : std::vector<int>();
 }
 
+int GLCanvas3DManager::get_first_volume_id(wxGLCanvas* canvas, int obj_idx) const
+{
+    CanvasesMap::const_iterator it = _get_canvas(canvas);
+    return (it != m_canvases.end()) ? it->second->get_first_volume_id(obj_idx) : -1;
+}
+
 void GLCanvas3DManager::reload_scene(wxGLCanvas* canvas, bool force)
 {
     CanvasesMap::iterator it = _get_canvas(canvas);
@@ -765,6 +777,13 @@ void GLCanvas3DManager::register_action_layersediting_callback(wxGLCanvas* canva
         it->second->register_action_layersediting_callback(callback);
 }
 
+void GLCanvas3DManager::register_action_selectbyparts_callback(wxGLCanvas* canvas, void* callback)
+{
+    CanvasesMap::iterator it = _get_canvas(canvas);
+    if (it != m_canvases.end())
+        it->second->register_action_selectbyparts_callback(callback);
+}
+
 GLCanvas3DManager::CanvasesMap::iterator GLCanvas3DManager::_get_canvas(wxGLCanvas* canvas)
 {
     return (canvas == nullptr) ? m_canvases.end() : m_canvases.find(canvas);
diff --git a/xs/src/slic3r/GUI/GLCanvas3DManager.hpp b/xs/src/slic3r/GUI/GLCanvas3DManager.hpp
index f7705a56c..1c715a9a3 100644
--- a/xs/src/slic3r/GUI/GLCanvas3DManager.hpp
+++ b/xs/src/slic3r/GUI/GLCanvas3DManager.hpp
@@ -98,6 +98,8 @@ public:
     void set_select_by(wxGLCanvas* canvas, const std::string& value);
     void set_drag_by(wxGLCanvas* canvas, const std::string& value);
 
+    std::string get_select_by(wxGLCanvas* canvas) const;
+
     bool is_layers_editing_enabled(wxGLCanvas* canvas) const;
     bool is_layers_editing_allowed(wxGLCanvas* canvas) const;
     bool is_shader_enabled(wxGLCanvas* canvas) const;
@@ -135,6 +137,8 @@ public:
     std::vector<int> load_object(wxGLCanvas* canvas, const ModelObject* model_object, int obj_idx, std::vector<int> instance_idxs);
     std::vector<int> load_object(wxGLCanvas* canvas, const Model* model, int obj_idx);
 
+    int get_first_volume_id(wxGLCanvas* canvas, int obj_idx) const;
+
     void reload_scene(wxGLCanvas* canvas, bool force);
 
     void load_gcode_preview(wxGLCanvas* canvas, const GCodePreviewData* preview_data, const std::vector<std::string>& str_tool_colors);
@@ -171,6 +175,7 @@ public:
     void register_action_cut_callback(wxGLCanvas* canvas, void* callback);
     void register_action_settings_callback(wxGLCanvas* canvas, void* callback);
     void register_action_layersediting_callback(wxGLCanvas* canvas, void* callback);
+    void register_action_selectbyparts_callback(wxGLCanvas* canvas, void* callback);
 
 private:
     CanvasesMap::iterator _get_canvas(wxGLCanvas* canvas);
diff --git a/xs/src/slic3r/GUI/GLGizmo.cpp b/xs/src/slic3r/GUI/GLGizmo.cpp
index be085e913..1d02e1752 100644
--- a/xs/src/slic3r/GUI/GLGizmo.cpp
+++ b/xs/src/slic3r/GUI/GLGizmo.cpp
@@ -15,14 +15,95 @@ static const float DEFAULT_BASE_COLOR[3] = { 0.625f, 0.625f, 0.625f };
 static const float DEFAULT_DRAG_COLOR[3] = { 1.0f, 1.0f, 1.0f };
 static const float DEFAULT_HIGHLIGHT_COLOR[3] = { 1.0f, 0.38f, 0.0f };
 
-static const float RED[3] = { 1.0f, 0.0f, 0.0f };
-static const float GREEN[3] = { 0.0f, 1.0f, 0.0f };
-static const float BLUE[3] = { 0.0f, 0.0f, 1.0f };
+static const float AXES_COLOR[3][3] = { { 1.0f, 0.0f, 0.0f }, { 0.0f, 1.0f, 0.0f }, { 0.0f, 0.0f, 1.0f } };
 
 namespace Slic3r {
 namespace GUI {
 
-const float GLGizmoBase::Grabber::HalfSize = 2.0f;
+    // returns the intersection of the given ray with the plane parallel to plane XY and passing through the given center
+    // coordinates are local to the plane
+    Vec3d intersection_on_plane_xy(const Linef3& ray, const Vec3d& center)
+    {
+        Transform3d m = Transform3d::Identity();
+        m.translate(-center);
+        Vec2d mouse_pos_2d = to_2d(transform(ray, m).intersect_plane(0.0));
+        return Vec3d(mouse_pos_2d(0), mouse_pos_2d(1), 0.0);
+    }
+
+    // returns the intersection of the given ray with the plane parallel to plane XZ and passing through the given center
+    // coordinates are local to the plane
+    Vec3d intersection_on_plane_xz(const Linef3& ray, const Vec3d& center)
+    {
+        Transform3d m = Transform3d::Identity();
+        m.rotate(Eigen::AngleAxisd(-0.5 * (double)PI, Vec3d::UnitX()));
+        m.translate(-center);
+        Vec2d mouse_pos_2d = to_2d(transform(ray, m).intersect_plane(0.0));
+        return Vec3d(mouse_pos_2d(0), 0.0, mouse_pos_2d(1));
+    }
+
+    // returns the intersection of the given ray with the plane parallel to plane YZ and passing through the given center
+    // coordinates are local to the plane
+    Vec3d intersection_on_plane_yz(const Linef3& ray, const Vec3d& center)
+    {
+        Transform3d m = Transform3d::Identity();
+        m.rotate(Eigen::AngleAxisd(-0.5f * (double)PI, Vec3d::UnitY()));
+        m.translate(-center);
+        Vec2d mouse_pos_2d = to_2d(transform(ray, m).intersect_plane(0.0));
+
+        return Vec3d(0.0, mouse_pos_2d(1), -mouse_pos_2d(0));
+    }
+
+    // return an index:
+    // 0 for plane XY
+    // 1 for plane XZ
+    // 2 for plane YZ
+    // which indicates which plane is best suited for intersecting the given unit vector
+    // giving precedence to the plane with the given index
+    unsigned int select_best_plane(const Vec3d& unit_vector, unsigned int preferred_plane)
+    {
+        unsigned int ret = preferred_plane;
+
+        // 1st checks if the given vector is not parallel to the given preferred plane
+        double dot_to_normal = 0.0;
+        switch (ret)
+        {
+        case 0: // plane xy
+        {
+            dot_to_normal = std::abs(unit_vector.dot(Vec3d::UnitZ()));
+            break;
+        }
+        case 1: // plane xz
+        {
+            dot_to_normal = std::abs(unit_vector.dot(-Vec3d::UnitY()));
+            break;
+        }
+        case 2: // plane yz
+        {
+            dot_to_normal = std::abs(unit_vector.dot(Vec3d::UnitX()));
+            break;
+        }
+        default:
+        {
+            break;
+        }
+        }
+
+        // if almost parallel, select the plane whose normal direction is closest to the given vector direction,
+        // otherwise return the given preferred plane index
+        if (dot_to_normal < 0.1)
+        {
+            typedef std::map<double, unsigned int> ProjsMap;
+            ProjsMap projs_map;
+            projs_map.insert(ProjsMap::value_type(std::abs(unit_vector.dot(Vec3d::UnitZ())), 0));  // plane xy
+            projs_map.insert(ProjsMap::value_type(std::abs(unit_vector.dot(-Vec3d::UnitY())), 1)); // plane xz
+            projs_map.insert(ProjsMap::value_type(std::abs(unit_vector.dot(Vec3d::UnitX())), 2));  // plane yz
+            ret = projs_map.rbegin()->second;
+        }
+
+        return ret;
+    }
+    
+    const float GLGizmoBase::Grabber::HalfSize = 2.0f;
 const float GLGizmoBase::Grabber::DraggingScaleFactor = 1.25f;
 
 GLGizmoBase::Grabber::Grabber()
@@ -131,6 +212,7 @@ GLGizmoBase::GLGizmoBase(GLCanvas3D& parent)
     , m_group_id(-1)
     , m_state(Off)
     , m_hover_id(-1)
+    , m_dragging(false)
 {
     ::memcpy((void*)m_base_color, (const void*)DEFAULT_BASE_COLOR, 3 * sizeof(float));
     ::memcpy((void*)m_drag_color, (const void*)DEFAULT_DRAG_COLOR, 3 * sizeof(float));
@@ -152,18 +234,21 @@ void GLGizmoBase::set_highlight_color(const float* color)
         ::memcpy((void*)m_highlight_color, (const void*)color, 3 * sizeof(float));
 }
 
-void GLGizmoBase::start_dragging()
+void GLGizmoBase::start_dragging(const BoundingBoxf3& box)
 {
+    m_dragging = true;
+
     for (int i = 0; i < (int)m_grabbers.size(); ++i)
     {
         m_grabbers[i].dragging = (m_hover_id == i);
     }
 
-    on_start_dragging();
+    on_start_dragging(box);
 }
 
 void GLGizmoBase::stop_dragging()
 {
+    m_dragging = false;
     set_tooltip("");
 
     for (int i = 0; i < (int)m_grabbers.size(); ++i)
@@ -199,8 +284,11 @@ void GLGizmoBase::render_grabbers() const
 
 void GLGizmoBase::render_grabbers_for_picking() const
 {
-    for (int i = 0; i < (int)m_grabbers.size(); ++i)
+    for (unsigned int i = 0; i < (unsigned int)m_grabbers.size(); ++i)
     {
+        m_grabbers[i].color[0] = 1.0f;
+        m_grabbers[i].color[1] = 1.0f;
+        m_grabbers[i].color[2] = picking_color_component(i);
         m_grabbers[i].render_for_picking();
     }
 }
@@ -234,7 +322,6 @@ GLGizmoRotate::GLGizmoRotate(GLCanvas3D& parent, GLGizmoRotate::Axis axis)
     , m_angle(0.0)
     , m_center(0.0, 0.0, 0.0)
     , m_radius(0.0f)
-    , m_keep_initial_values(false)
 {
 }
 
@@ -252,6 +339,12 @@ bool GLGizmoRotate::on_init()
     return true;
 }
 
+void GLGizmoRotate::on_start_dragging(const BoundingBoxf3& box)
+{
+    m_center = box.center();
+    m_radius = Offset + box.radius();
+}
+
 void GLGizmoRotate::on_update(const Linef3& mouse_ray)
 { 
     Vec2d mouse_pos = to_2d(mouse_position_in_local_plane(mouse_ray));
@@ -293,18 +386,16 @@ void GLGizmoRotate::on_update(const Linef3& mouse_ray)
 
 void GLGizmoRotate::on_render(const BoundingBoxf3& box) const
 {
-    if (m_grabbers[0].dragging)
+    if (m_dragging)
         set_tooltip(format(m_angle * 180.0f / (float)PI, 4));
-
-    ::glEnable(GL_DEPTH_TEST);
-
-    if (!m_keep_initial_values)
+    else
     {
         m_center = box.center();
         m_radius = Offset + box.radius();
-        m_keep_initial_values = true;
     }
 
+    ::glEnable(GL_DEPTH_TEST);
+
     ::glPushMatrix();
     transform_to_local();
 
@@ -335,12 +426,8 @@ void GLGizmoRotate::on_render_for_picking(const BoundingBoxf3& box) const
     ::glDisable(GL_DEPTH_TEST);
 
     ::glPushMatrix();
+
     transform_to_local();
-
-    m_grabbers[0].color[0] = 1.0f;
-    m_grabbers[0].color[1] = 1.0f;
-    m_grabbers[0].color[2] = picking_color_component(0);
-
     render_grabbers_for_picking();
 
     ::glPopMatrix();
@@ -512,23 +599,29 @@ Vec3d GLGizmoRotate::mouse_position_in_local_plane(const Linef3& mouse_ray) cons
 
 GLGizmoRotate3D::GLGizmoRotate3D(GLCanvas3D& parent)
     : GLGizmoBase(parent)
-    , m_x(parent, GLGizmoRotate::X)
-    , m_y(parent, GLGizmoRotate::Y)
-    , m_z(parent, GLGizmoRotate::Z)
 {
-    m_x.set_group_id(0);
-    m_y.set_group_id(1);
-    m_z.set_group_id(2);
+    m_gizmos.emplace_back(parent, GLGizmoRotate::X);
+    m_gizmos.emplace_back(parent, GLGizmoRotate::Y);
+    m_gizmos.emplace_back(parent, GLGizmoRotate::Z);
+
+    for (unsigned int i = 0; i < 3; ++i)
+    {
+        m_gizmos[i].set_group_id(i);
+    }
 }
 
 bool GLGizmoRotate3D::on_init()
 {
-    if (!m_x.init() || !m_y.init() || !m_z.init())
-        return false;
+    for (GLGizmoRotate& g : m_gizmos)
+    {
+        if (!g.init())
+            return false;
+    }
 
-    m_x.set_highlight_color(RED);
-    m_y.set_highlight_color(GREEN);
-    m_z.set_highlight_color(BLUE);
+    for (unsigned int i = 0; i < 3; ++i)
+    {
+        m_gizmos[i].set_highlight_color(AXES_COLOR[i]);
+    }
 
     std::string path = resources_dir() + "/icons/overlay/";
 
@@ -547,68 +640,28 @@ bool GLGizmoRotate3D::on_init()
     return true;
 }
 
-void GLGizmoRotate3D::on_start_dragging()
+void GLGizmoRotate3D::on_start_dragging(const BoundingBoxf3& box)
 {
-    switch (m_hover_id)
-    {
-    case 0:
-    {
-        m_x.start_dragging();
-        break;
-    }
-    case 1:
-    {
-        m_y.start_dragging();
-        break;
-    }
-    case 2:
-    {
-        m_z.start_dragging();
-        break;
-    }
-    default:
-    {
-        break;
-    }
-    }
+    if ((0 <= m_hover_id) && (m_hover_id < 3))
+        m_gizmos[m_hover_id].start_dragging(box);
 }
 
 void GLGizmoRotate3D::on_stop_dragging()
 {
-    switch (m_hover_id)
-    {
-    case 0:
-    {
-        m_x.stop_dragging();
-        break;
-    }
-    case 1:
-    {
-        m_y.stop_dragging();
-        break;
-    }
-    case 2:
-    {
-        m_z.stop_dragging();
-        break;
-    }
-    default:
-    {
-        break;
-    }
-    }
+    if ((0 <= m_hover_id) && (m_hover_id < 3))
+        m_gizmos[m_hover_id].stop_dragging();
 }
 
 void GLGizmoRotate3D::on_render(const BoundingBoxf3& box) const
 {
     if ((m_hover_id == -1) || (m_hover_id == 0))
-        m_x.render(box);
+        m_gizmos[X].render(box);
 
     if ((m_hover_id == -1) || (m_hover_id == 1))
-        m_y.render(box);
+        m_gizmos[Y].render(box);
 
     if ((m_hover_id == -1) || (m_hover_id == 2))
-        m_z.render(box);
+        m_gizmos[Z].render(box);
 }
 
 const float GLGizmoScale3D::Offset = 5.0f;
@@ -655,13 +708,13 @@ bool GLGizmoScale3D::on_init()
     return true;
 }
 
-void GLGizmoScale3D::on_start_dragging()
+void GLGizmoScale3D::on_start_dragging(const BoundingBoxf3& box)
 {
     if (m_hover_id != -1)
     {
         m_starting_drag_position = m_grabbers[m_hover_id].center;
         m_show_starting_box = true;
-        m_starting_box = m_box;
+        m_starting_box = box;
     }
 }
 
@@ -703,20 +756,20 @@ void GLGizmoScale3D::on_render(const BoundingBoxf3& box) const
     // x axis
     m_grabbers[0].center = Vec3d(m_box.min(0), center(1), center(2));
     m_grabbers[1].center = Vec3d(m_box.max(0), center(1), center(2));
-    ::memcpy((void*)m_grabbers[0].color, (const void*)RED, 3 * sizeof(float));
-    ::memcpy((void*)m_grabbers[1].color, (const void*)RED, 3 * sizeof(float));
+    ::memcpy((void*)m_grabbers[0].color, (const void*)&AXES_COLOR[0], 3 * sizeof(float));
+    ::memcpy((void*)m_grabbers[1].color, (const void*)&AXES_COLOR[0], 3 * sizeof(float));
 
     // y axis
     m_grabbers[2].center = Vec3d(center(0), m_box.min(1), center(2));
     m_grabbers[3].center = Vec3d(center(0), m_box.max(1), center(2));
-    ::memcpy((void*)m_grabbers[2].color, (const void*)GREEN, 3 * sizeof(float));
-    ::memcpy((void*)m_grabbers[3].color, (const void*)GREEN, 3 * sizeof(float));
+    ::memcpy((void*)m_grabbers[2].color, (const void*)&AXES_COLOR[1], 3 * sizeof(float));
+    ::memcpy((void*)m_grabbers[3].color, (const void*)&AXES_COLOR[1], 3 * sizeof(float));
 
     // z axis
     m_grabbers[4].center = Vec3d(center(0), center(1), m_box.min(2));
     m_grabbers[5].center = Vec3d(center(0), center(1), m_box.max(2));
-    ::memcpy((void*)m_grabbers[4].color, (const void*)BLUE, 3 * sizeof(float));
-    ::memcpy((void*)m_grabbers[5].color, (const void*)BLUE, 3 * sizeof(float));
+    ::memcpy((void*)m_grabbers[4].color, (const void*)&AXES_COLOR[2], 3 * sizeof(float));
+    ::memcpy((void*)m_grabbers[5].color, (const void*)&AXES_COLOR[2], 3 * sizeof(float));
 
     // uniform
     m_grabbers[6].center = Vec3d(m_box.min(0), m_box.min(1), m_box.min(2));
@@ -735,6 +788,13 @@ void GLGizmoScale3D::on_render(const BoundingBoxf3& box) const
         // draw box
         ::glColor3fv(m_base_color);
         render_box(m_box);
+        // draw connections
+        ::glColor3fv(m_grabbers[0].color);
+        render_grabbers_connection(0, 1);
+        ::glColor3fv(m_grabbers[2].color);
+        render_grabbers_connection(2, 3);
+        ::glColor3fv(m_grabbers[4].color);
+        render_grabbers_connection(4, 5);
         // draw grabbers
         render_grabbers();
     }
@@ -815,13 +875,6 @@ void GLGizmoScale3D::on_render_for_picking(const BoundingBoxf3& box) const
 {
     ::glDisable(GL_DEPTH_TEST);
 
-    for (unsigned int i = 0; i < (unsigned int)m_grabbers.size(); ++i)
-    {
-        m_grabbers[i].color[0] = 1.0f;
-        m_grabbers[i].color[1] = 1.0f;
-        m_grabbers[i].color[2] = picking_color_component(i);
-    }
-
     render_grabbers_for_picking();
 }
 
@@ -911,77 +964,24 @@ double GLGizmoScale3D::calc_ratio(unsigned int preferred_plane_id, const Linef3&
 
     Vec3d starting_vec_dir = starting_vec.normalized();
     Vec3d mouse_dir = mouse_ray.unit_vector();
-    unsigned int plane_id = preferred_plane_id;
 
-    // 1st try to see if the mouse direction is close enough to the preferred plane normal
-    double dot_to_normal = 0.0;
+    unsigned int plane_id = select_best_plane(mouse_dir, preferred_plane_id);
+    // ratio is given by the projection of the calculated intersection on the starting vector divided by the starting vector length
     switch (plane_id)
     {
     case 0:
     {
-        dot_to_normal = std::abs(mouse_dir.dot(Vec3d::UnitZ()));
+        ratio = starting_vec_dir.dot(intersection_on_plane_xy(mouse_ray, center)) / len_starting_vec;
         break;
     }
     case 1:
     {
-        dot_to_normal = std::abs(mouse_dir.dot(-Vec3d::UnitY()));
+        ratio = starting_vec_dir.dot(intersection_on_plane_xz(mouse_ray, center)) / len_starting_vec;
         break;
     }
     case 2:
     {
-        dot_to_normal = std::abs(mouse_dir.dot(Vec3d::UnitX()));
-        break;
-    }
-    }
-
-    if (dot_to_normal < 0.1)
-    {
-        // if not, select the plane who's normal is closest to the mouse direction
-
-        typedef std::map<double, unsigned int> ProjsMap;
-        ProjsMap projs_map;
-
-        projs_map.insert(ProjsMap::value_type(std::abs(mouse_dir.dot(Vec3d::UnitZ())), 0));  // plane xy
-        projs_map.insert(ProjsMap::value_type(std::abs(mouse_dir.dot(-Vec3d::UnitY())), 1)); // plane xz
-        projs_map.insert(ProjsMap::value_type(std::abs(mouse_dir.dot(Vec3d::UnitX())), 2));  // plane yz
-        plane_id = projs_map.rbegin()->second;
-    }
-
-    switch (plane_id)
-    {
-    case 0:
-    {
-        // calculates the intersection of the mouse ray with the plane parallel to plane XY and passing through the given center
-        Transform3d m = Transform3d::Identity();
-        m.translate(-center);
-        Vec2d mouse_pos_2d = to_2d(transform(mouse_ray, m).intersect_plane(0.0));
-
-        // ratio is given by the projection of the calculated intersection on the starting vector divided by the starting vector length
-        ratio = starting_vec_dir.dot(Vec3d(mouse_pos_2d(0), mouse_pos_2d(1), 0.0)) / len_starting_vec;
-        break;
-    }
-    case 1:
-    {
-        // calculates the intersection of the mouse ray with the plane parallel to plane XZ and passing through the given center
-        Transform3d m = Transform3d::Identity();
-        m.rotate(Eigen::AngleAxisd(-0.5 * (double)PI, Vec3d::UnitX()));
-        m.translate(-center);
-        Vec2d mouse_pos_2d = to_2d(transform(mouse_ray, m).intersect_plane(0.0));
-
-        // ratio is given by the projection of the calculated intersection on the starting vector divided by the starting vector length
-        ratio = starting_vec_dir.dot(Vec3d(mouse_pos_2d(0), 0.0, mouse_pos_2d(1))) / len_starting_vec;
-        break;
-    }
-    case 2:
-    {
-        // calculates the intersection of the mouse ray with the plane parallel to plane YZ and passing through the given center
-        Transform3d m = Transform3d::Identity();
-        m.rotate(Eigen::AngleAxisd(-0.5f * (double)PI, Vec3d::UnitY()));
-        m.translate(-center);
-        Vec2d mouse_pos_2d = to_2d(transform(mouse_ray, m).intersect_plane(0.0));
-
-        // ratio is given by the projection of the calculated intersection on the starting vector divided by the starting vector length
-        ratio = starting_vec_dir.dot(Vec3d(0.0, mouse_pos_2d(1), -mouse_pos_2d(0))) / len_starting_vec;
+        ratio = starting_vec_dir.dot(intersection_on_plane_yz(mouse_ray, center)) / len_starting_vec;
         break;
     }
     }
@@ -992,7 +992,8 @@ double GLGizmoScale3D::calc_ratio(unsigned int preferred_plane_id, const Linef3&
 
 GLGizmoFlatten::GLGizmoFlatten(GLCanvas3D& parent)
     : GLGizmoBase(parent)
-    , m_normal(0.0, 0.0, 0.0)
+    , m_normal(Vec3d::Zero())
+    , m_starting_center(Vec3d::Zero())
 {
 }
 
@@ -1015,10 +1016,13 @@ bool GLGizmoFlatten::on_init()
     return true;
 }
 
-void GLGizmoFlatten::on_start_dragging()
+void GLGizmoFlatten::on_start_dragging(const BoundingBoxf3& box)
 {
     if (m_hover_id != -1)
+    {
         m_normal = m_planes[m_hover_id].normal;
+        m_starting_center = box.center();
+    }
 }
 
 void GLGizmoFlatten::on_render(const BoundingBoxf3& box) const
@@ -1026,13 +1030,10 @@ void GLGizmoFlatten::on_render(const BoundingBoxf3& box) const
     // the dragged_offset is a vector measuring where was the object moved
     // with the gizmo being on. This is reset in set_flattening_data and
     // does not work correctly when there are multiple copies.
-    if (!m_center) // this is the first bounding box that we see
-        m_center.reset(new Vec3d(box.center()));
+    Vec3d dragged_offset(Vec3d::Zero());
+    if (m_dragging)
+        dragged_offset = box.center() - m_starting_center;
 
-    Vec3d dragged_offset = box.center() - *m_center;
-
-    bool blending_was_enabled = ::glIsEnabled(GL_BLEND);
-    bool depth_test_was_enabled = ::glIsEnabled(GL_DEPTH_TEST);
     ::glEnable(GL_BLEND);
     ::glEnable(GL_DEPTH_TEST);
 
@@ -1054,20 +1055,15 @@ void GLGizmoFlatten::on_render(const BoundingBoxf3& box) const
         }
     }
 
-    if (!blending_was_enabled)
-        ::glDisable(GL_BLEND);
-    if (!depth_test_was_enabled)
-        ::glDisable(GL_DEPTH_TEST);
+    ::glDisable(GL_BLEND);
 }
 
 void GLGizmoFlatten::on_render_for_picking(const BoundingBoxf3& box) const
 {
-    ::glDisable(GL_DEPTH_TEST);
+    ::glEnable(GL_DEPTH_TEST);
 
     for (unsigned int i = 0; i < m_planes.size(); ++i)
     {
-        // FIXME: the color assignement will fail if the planes count is greater than 254
-        //        use the other color components in that case !!
         ::glColor3f(1.0f, 1.0f, picking_color_component(i));
         for (const Vec2d& offset : m_instances_positions) {
             ::glPushMatrix();
@@ -1083,7 +1079,6 @@ void GLGizmoFlatten::on_render_for_picking(const BoundingBoxf3& box) const
 
 void GLGizmoFlatten::set_flattening_data(const ModelObject* model_object)
 {
-    m_center.release(); // object is not being dragged (this would not be called otherwise) - we must forget about the bounding box position...
     m_model_object = model_object;
 
     // ...and save the updated positions of the object instances:
@@ -1245,9 +1240,9 @@ void GLGizmoFlatten::update_planes()
         polygon = transform(polygon, m);
     }
 
-    // We'll sort the planes by area and only keep the 255 largest ones (because of the picking pass limitations):
+    // We'll sort the planes by area and only keep the 254 largest ones (because of the picking pass limitations):
     std::sort(m_planes.rbegin(), m_planes.rend(), [](const PlaneData& a, const PlaneData& b) { return a.area < b.area; });
-    m_planes.resize(std::min((int)m_planes.size(), 255));
+    m_planes.resize(std::min((int)m_planes.size(), 254));
 
     // Planes are finished - let's save what we calculated it from:
     m_source_data.bounding_boxes.clear();
@@ -1285,11 +1280,9 @@ bool GLGizmoFlatten::is_plane_update_necessary() const
 }
 
 Vec3d GLGizmoFlatten::get_flattening_normal() const {
-    Transform3d m = Transform3d::Identity();
-    m.rotate(Eigen::AngleAxisd(-m_model_object->instances.front()->rotation, Vec3d::UnitZ()));
-    Vec3d normal = m * m_normal;
+    Vec3d normal = m_model_object->instances.front()->world_matrix(true).matrix().block(0, 0, 3, 3).inverse() * m_normal;
     m_normal = Vec3d::Zero();
-    return normal;
+    return normal.normalized();
 }
 
 } // namespace GUI
diff --git a/xs/src/slic3r/GUI/GLGizmo.hpp b/xs/src/slic3r/GUI/GLGizmo.hpp
index 3041f2adf..0599955ed 100644
--- a/xs/src/slic3r/GUI/GLGizmo.hpp
+++ b/xs/src/slic3r/GUI/GLGizmo.hpp
@@ -57,6 +57,7 @@ protected:
     // textures are assumed to be square and all with the same size in pixels, no internal check is done
     GLTexture m_textures[Num_States];
     int m_hover_id;
+    bool m_dragging;
     float m_base_color[3];
     float m_drag_color[3];
     float m_highlight_color[3];
@@ -82,10 +83,11 @@ public:
 
     void set_highlight_color(const float* color);
 
-    void start_dragging();
+    void start_dragging(const BoundingBoxf3& box);
     void stop_dragging();
+    bool is_dragging() const { return m_dragging; }
+
     void update(const Linef3& mouse_ray);
-    void refresh() { on_refresh(); }
 
     void render(const BoundingBoxf3& box) const { on_render(box); }
     void render_for_picking(const BoundingBoxf3& box) const { on_render_for_picking(box); }
@@ -94,10 +96,9 @@ protected:
     virtual bool on_init() = 0;
     virtual void on_set_state() {}
     virtual void on_set_hover_id() {}
-    virtual void on_start_dragging() {}
+    virtual void on_start_dragging(const BoundingBoxf3& box) {}
     virtual void on_stop_dragging() {}
     virtual void on_update(const Linef3& mouse_ray) = 0;
-    virtual void on_refresh() {}
     virtual void on_render(const BoundingBoxf3& box) const = 0;
     virtual void on_render_for_picking(const BoundingBoxf3& box) const = 0;
 
@@ -136,7 +137,6 @@ private:
 
     mutable Vec3d m_center;
     mutable float m_radius;
-    mutable bool m_keep_initial_values;
 
 public:
     GLGizmoRotate(GLCanvas3D& parent, Axis axis);
@@ -146,9 +146,8 @@ public:
 
 protected:
     virtual bool on_init();
-    virtual void on_set_state() { m_keep_initial_values = (m_state == On) ? false : true; }
+    virtual void on_start_dragging(const BoundingBoxf3& box);
     virtual void on_update(const Linef3& mouse_ray);
-    virtual void on_refresh() { m_keep_initial_values = false; }
     virtual void on_render(const BoundingBoxf3& box) const;
     virtual void on_render_for_picking(const BoundingBoxf3& box) const;
 
@@ -167,56 +166,52 @@ private:
 
 class GLGizmoRotate3D : public GLGizmoBase
 {
-    GLGizmoRotate m_x;
-    GLGizmoRotate m_y;
-    GLGizmoRotate m_z;
+    std::vector<GLGizmoRotate> m_gizmos;
 
 public:
     explicit GLGizmoRotate3D(GLCanvas3D& parent);
 
-    double get_angle_x() const { return m_x.get_angle(); }
-    void set_angle_x(double angle) { m_x.set_angle(angle); }
+    double get_angle_x() const { return m_gizmos[X].get_angle(); }
+    void set_angle_x(double angle) { m_gizmos[X].set_angle(angle); }
 
-    double get_angle_y() const { return m_y.get_angle(); }
-    void set_angle_y(double angle) { m_y.set_angle(angle); }
+    double get_angle_y() const { return m_gizmos[Y].get_angle(); }
+    void set_angle_y(double angle) { m_gizmos[Y].set_angle(angle); }
 
-    double get_angle_z() const { return m_z.get_angle(); }
-    void set_angle_z(double angle) { m_z.set_angle(angle); }
+    double get_angle_z() const { return m_gizmos[Z].get_angle(); }
+    void set_angle_z(double angle) { m_gizmos[Z].set_angle(angle); }
 
 protected:
     virtual bool on_init();
     virtual void on_set_state()
     {
-        m_x.set_state(m_state);
-        m_y.set_state(m_state);
-        m_z.set_state(m_state);
+        for (GLGizmoRotate& g : m_gizmos)
+        {
+            g.set_state(m_state);
+        }
     }
     virtual void on_set_hover_id()
     {
-        m_x.set_hover_id(m_hover_id == 0 ? 0 : -1);
-        m_y.set_hover_id(m_hover_id == 1 ? 0 : -1);
-        m_z.set_hover_id(m_hover_id == 2 ? 0 : -1);
+        for (unsigned int i = 0; i < 3; ++i)
+        {
+            m_gizmos[i].set_hover_id((m_hover_id == i) ? 0 : -1);
+        }
     }
-    virtual void on_start_dragging();
+    virtual void on_start_dragging(const BoundingBoxf3& box);
     virtual void on_stop_dragging();
     virtual void on_update(const Linef3& mouse_ray)
     {
-        m_x.update(mouse_ray);
-        m_y.update(mouse_ray);
-        m_z.update(mouse_ray);
-    }
-    virtual void on_refresh()
-    {
-        m_x.refresh();
-        m_y.refresh();
-        m_z.refresh();
+        for (GLGizmoRotate& g : m_gizmos)
+        {
+            g.update(mouse_ray);
+        }
     }
     virtual void on_render(const BoundingBoxf3& box) const;
     virtual void on_render_for_picking(const BoundingBoxf3& box) const
     {
-        m_x.render_for_picking(box);
-        m_y.render_for_picking(box);
-        m_z.render_for_picking(box);
+        for (const GLGizmoRotate& g : m_gizmos)
+        {
+            g.render_for_picking(box);
+        }
     }
 };
 
@@ -249,7 +244,7 @@ public:
 
 protected:
     virtual bool on_init();
-    virtual void on_start_dragging();
+    virtual void on_start_dragging(const BoundingBoxf3& box);
     virtual void on_stop_dragging() { m_show_starting_box = false; }
     virtual void on_update(const Linef3& mouse_ray);
     virtual void on_render(const BoundingBoxf3& box) const;
@@ -291,7 +286,7 @@ private:
 
     std::vector<PlaneData> m_planes;
     std::vector<Vec2d> m_instances_positions;
-    mutable std::unique_ptr<Vec3d> m_center = nullptr;
+    Vec3d m_starting_center;
     const ModelObject* m_model_object = nullptr;
 
     void update_planes();
@@ -305,11 +300,12 @@ public:
 
 protected:
     virtual bool on_init();
-    virtual void on_start_dragging();
+    virtual void on_start_dragging(const BoundingBoxf3& box);
     virtual void on_update(const Linef3& mouse_ray) {}
     virtual void on_render(const BoundingBoxf3& box) const;
     virtual void on_render_for_picking(const BoundingBoxf3& box) const;
-    virtual void on_set_state() {
+    virtual void on_set_state()
+    {
         if (m_state == On && is_plane_update_necessary())
             update_planes();
     }
diff --git a/xs/src/slic3r/GUI/GUI_ObjectParts.cpp b/xs/src/slic3r/GUI/GUI_ObjectParts.cpp
index 94555f50e..af57db8ed 100644
--- a/xs/src/slic3r/GUI/GUI_ObjectParts.cpp
+++ b/xs/src/slic3r/GUI/GUI_ObjectParts.cpp
@@ -1368,13 +1368,20 @@ void update_settings_value()
 {
 	auto og = get_optgroup(ogFrequentlyObjectSettings);
 	if (m_selected_object_id < 0 || m_objects->size() <= m_selected_object_id) {
-		og->set_value("scale_x", 0);
+        og->set_value("position_x", 0);
+        og->set_value("position_y", 0);
+        og->set_value("position_z", 0);
+        og->set_value("scale_x", 0);
 		og->set_value("scale_y", 0);
 		og->set_value("scale_z", 0);
+        og->set_value("rotation_x", 0);
+        og->set_value("rotation_y", 0);
+        og->set_value("rotation_z", 0);
         og->disable();
 		return;
 	}
     g_is_percent_scale = boost::any_cast<wxString>(og->get_value("scale_unit")) == _("%");
+    update_position_values();
     update_scale_values();
     update_rotation_values();
     og->enable();
@@ -1534,50 +1541,94 @@ void update_extruder_in_config(const wxString& selection)
 }
 
 void update_scale_values()
-{
-    update_scale_values((*m_objects)[m_selected_object_id]->instance_bounding_box(0).size(),
-                        (*m_objects)[m_selected_object_id]->instances[0]->scaling_factor);
-}
-
-void update_scale_values(const Vec3d& size, float scaling_factor)
 {
     auto og = get_optgroup(ogFrequentlyObjectSettings);
+    auto instance = (*m_objects)[m_selected_object_id]->instances.front();
+    auto size = (*m_objects)[m_selected_object_id]->instance_bounding_box(0).size();
 
     if (g_is_percent_scale) {
-        auto scale = scaling_factor * 100;
+        auto scale = instance->scaling_factor * 100.0;
         og->set_value("scale_x", int(scale));
         og->set_value("scale_y", int(scale));
         og->set_value("scale_z", int(scale));
     }
     else {
-        og->set_value("scale_x", int(size(0) + 0.5));
-        og->set_value("scale_y", int(size(1) + 0.5));
-        og->set_value("scale_z", int(size(2) + 0.5));
+        og->set_value("scale_x", int(instance->scaling_factor * size(0) + 0.5));
+        og->set_value("scale_y", int(instance->scaling_factor * size(1) + 0.5));
+        og->set_value("scale_z", int(instance->scaling_factor * size(2) + 0.5));
     }
 }
 
+void update_position_values()
+{
+    auto og = get_optgroup(ogFrequentlyObjectSettings);
+    auto instance = (*m_objects)[m_selected_object_id]->instances.front();
+
+    og->set_value("position_x", int(instance->offset(0)));
+    og->set_value("position_y", int(instance->offset(1)));
+    og->set_value("position_z", 0);
+}
+
+void update_position_values(const Vec3d& position)
+{
+    auto og = get_optgroup(ogFrequentlyObjectSettings);
+
+    og->set_value("position_x", int(position(0)));
+    og->set_value("position_y", int(position(1)));
+    og->set_value("position_z", int(position(2)));
+}
+
+void update_scale_values(double scaling_factor)
+{
+    auto og = get_optgroup(ogFrequentlyObjectSettings);
+
+    // this is temporary
+    // to be able to update the values as size
+    // we need to store somewhere the original size
+    // or have it passed as parameter
+    if (!g_is_percent_scale)
+        og->set_value("scale_unit", _("%"));
+
+    auto scale = scaling_factor * 100.0;
+    og->set_value("scale_x", int(scale));
+    og->set_value("scale_y", int(scale));
+    og->set_value("scale_z", int(scale));
+}
+
 void update_rotation_values()
 {
     auto og = get_optgroup(ogFrequentlyObjectSettings);
-
+    auto instance = (*m_objects)[m_selected_object_id]->instances.front();
     og->set_value("rotation_x", 0);
     og->set_value("rotation_y", 0);
-
-    auto rotation_z = (*m_objects)[m_selected_object_id]->instances[0]->rotation;
-    auto deg = int(Geometry::rad2deg(rotation_z));
-//     if (deg > 180) deg -= 360;
-
-    og->set_value("rotation_z", deg);
+    og->set_value("rotation_z", int(Geometry::rad2deg(instance->rotation)));
 }
 
-void update_rotation_value(const double angle, const std::string& axis)
+void update_rotation_value(double angle, Axis axis)
 {
     auto og = get_optgroup(ogFrequentlyObjectSettings);
-    
-    int deg = int(Geometry::rad2deg(angle));
-//     if (deg>180) deg -= 360;
 
-    og->set_value("rotation_"+axis, deg);
+    std::string axis_str;
+    switch (axis)
+    {
+    case X:
+    {
+        axis_str = "rotation_x";
+        break;
+    }
+    case Y:
+    {
+        axis_str = "rotation_y";
+        break;
+    }
+    case Z:
+    {
+        axis_str = "rotation_z";
+        break;
+    }
+    }
+
+    og->set_value(axis_str, int(Geometry::rad2deg(angle)));
 }
 
 void set_uniform_scaling(const bool uniform_scale)
diff --git a/xs/src/slic3r/GUI/GUI_ObjectParts.hpp b/xs/src/slic3r/GUI/GUI_ObjectParts.hpp
index 82bfe4a6c..8a1499e03 100644
--- a/xs/src/slic3r/GUI/GUI_ObjectParts.hpp
+++ b/xs/src/slic3r/GUI/GUI_ObjectParts.hpp
@@ -107,13 +107,16 @@ void update_settings_value();
 void set_extruder_column_hidden(bool hide);
 // update extruder in current config
 void update_extruder_in_config(const wxString& selection);
+// update position values displacements or "gizmos"
+void update_position_values();
+void update_position_values(const Vec3d& position);
 // update scale values after scale unit changing or "gizmos"
 void update_scale_values();
-void update_scale_values(const Vec3d& size, float scale);
+void update_scale_values(double scaling_factor);
 // update rotation values object selection changing
 void update_rotation_values();
 // update rotation value after "gizmos"
-void update_rotation_value(const double angle, const std::string& axis);
+void update_rotation_value(double angle, Axis axis);
 void set_uniform_scaling(const bool uniform_scale);
 
 void on_begin_drag(wxDataViewEvent &event);
diff --git a/xs/src/slic3r/Utils/Duet.cpp b/xs/src/slic3r/Utils/Duet.cpp
index 865d2b418..f25327161 100644
--- a/xs/src/slic3r/Utils/Duet.cpp
+++ b/xs/src/slic3r/Utils/Duet.cpp
@@ -197,7 +197,7 @@ std::string Duet::get_upload_url(const std::string &filename) const
 {
 	return (boost::format("%1%rr_upload?name=0:/gcodes/%2%&%3%")
 			% get_base_url()
-			% filename 
+			% Http::url_encode(filename) 
 			% timestamp_str()).str();
 }
 
@@ -230,7 +230,7 @@ std::string Duet::timestamp_str() const
 	auto tm = *std::localtime(&t);
 
 	char buffer[BUFFER_SIZE];
-	std::strftime(buffer, BUFFER_SIZE, "time=%Y-%d-%mT%H:%M:%S", &tm);
+	std::strftime(buffer, BUFFER_SIZE, "time=%Y-%m-%dT%H:%M:%S", &tm);
 
 	return std::string(buffer);
 }
@@ -248,9 +248,10 @@ wxString Duet::format_error(const std::string &body, const std::string &error, u
 bool Duet::start_print(wxString &msg, const std::string &filename) const 
 {
 	bool res = false;
+	
 	auto url = (boost::format("%1%rr_gcode?gcode=M32%%20\"%2%\"")
 			% get_base_url()
-			% filename).str();
+			% Http::url_encode(filename)).str();
 
 	auto http = Http::get(std::move(url));
 	http.on_error([&](std::string body, std::string error, unsigned status) {
@@ -275,5 +276,4 @@ int Duet::get_err_code_from_body(const std::string &body) const
 	return root.get<int>("err", 0);
 }
 
-
 }
diff --git a/xs/src/slic3r/Utils/Http.cpp b/xs/src/slic3r/Utils/Http.cpp
index a92e399a0..9b67ceea8 100644
--- a/xs/src/slic3r/Utils/Http.cpp
+++ b/xs/src/slic3r/Utils/Http.cpp
@@ -421,6 +421,21 @@ bool Http::ca_file_supported()
 	return res;
 }
 
+std::string Http::url_encode(const std::string &str)
+{
+	::CURL *curl = ::curl_easy_init();
+	if (curl == nullptr) {
+		return str;
+	}
+	char *ce = ::curl_easy_escape(curl, str.c_str(), str.length());
+	std::string encoded = std::string(ce);
+
+	::curl_free(ce);
+	::curl_easy_cleanup(curl);
+
+	return encoded;
+}
+
 std::ostream& operator<<(std::ostream &os, const Http::Progress &progress)
 {
 	os << "Http::Progress("
diff --git a/xs/src/slic3r/Utils/Http.hpp b/xs/src/slic3r/Utils/Http.hpp
index f1302b0ed..44580b7ea 100644
--- a/xs/src/slic3r/Utils/Http.hpp
+++ b/xs/src/slic3r/Utils/Http.hpp
@@ -98,6 +98,9 @@ public:
 
 	// Tells whether current backend supports seting up a CA file using ca_file()
 	static bool ca_file_supported();
+
+	// converts the given string to an url_encoded_string
+	static std::string url_encode(const std::string &str);
 private:
 	Http(const std::string &url);
 
diff --git a/xs/xsp/GUI.xsp b/xs/xsp/GUI.xsp
index c18fce44d..03da43abe 100644
--- a/xs/xsp/GUI.xsp
+++ b/xs/xsp/GUI.xsp
@@ -154,10 +154,7 @@ void select_current_object(int idx)
 
 void remove_obj()
     %code%{ Slic3r::GUI::remove(); %};
-
-void update_rotation_value(double angle, const char *axis)
-    %code%{ Slic3r::GUI::update_rotation_value(angle, axis); %};
-
+    
 std::string fold_utf8_to_ascii(const char *src)
     %code%{ RETVAL = Slic3r::fold_utf8_to_ascii(src); %};
 
diff --git a/xs/xsp/GUI_3DScene.xsp b/xs/xsp/GUI_3DScene.xsp
index c15fdc196..756f9e547 100644
--- a/xs/xsp/GUI_3DScene.xsp
+++ b/xs/xsp/GUI_3DScene.xsp
@@ -56,9 +56,9 @@
     int                 volume_idx() const;
     int                 instance_idx() const;
     Clone<Vec3d>        origin() const
-        %code%{ RETVAL = THIS->get_origin(); %};
+        %code%{ RETVAL = THIS->get_offset(); %};
     void                translate(double x, double y, double z)
-        %code%{ THIS->set_origin(THIS->get_origin() + Vec3d(x, y, z)); %};
+        %code%{ THIS->set_offset(THIS->get_offset() + Vec3d(x, y, z)); %};
     Clone<BoundingBoxf3> bounding_box() const
         %code%{ RETVAL = THIS->bounding_box; %};
 
@@ -337,6 +337,14 @@ set_drag_by(canvas, value)
     CODE:
         _3DScene::set_drag_by((wxGLCanvas*)wxPli_sv_2_object(aTHX_ canvas, "Wx::GLCanvas"), value);
 
+std::string
+get_select_by(canvas)
+        SV *canvas;
+    CODE:
+        RETVAL = _3DScene::get_select_by((wxGLCanvas*)wxPli_sv_2_object(aTHX_ canvas, "Wx::GLCanvas"));
+    OUTPUT:
+        RETVAL
+
 bool
 is_layers_editing_enabled(canvas)
         SV *canvas;
@@ -720,6 +728,13 @@ register_action_layersediting_callback(canvas, callback)
     CODE:
         _3DScene::register_action_layersediting_callback((wxGLCanvas*)wxPli_sv_2_object(aTHX_ canvas, "Wx::GLCanvas"), (void*)callback);
 
+void
+register_action_selectbyparts_callback(canvas, callback)
+        SV *canvas;
+        SV *callback;
+    CODE:
+        _3DScene::register_action_selectbyparts_callback((wxGLCanvas*)wxPli_sv_2_object(aTHX_ canvas, "Wx::GLCanvas"), (void*)callback);
+        
 void
 reset_legend_texture()
     CODE:
@@ -736,6 +751,15 @@ load_model_object(canvas, model_object, obj_idx, instance_idxs)
     OUTPUT:
         RETVAL
 
+int
+get_first_volume_id(canvas, obj_idx)
+        SV  *canvas;
+        int obj_idx;
+    CODE:
+        RETVAL = _3DScene::get_first_volume_id((wxGLCanvas*)wxPli_sv_2_object(aTHX_ canvas, "Wx::GLCanvas"), obj_idx);
+    OUTPUT:
+        RETVAL
+
 std::vector<int>
 load_model(canvas, model, obj_idx)
         SV               *canvas;