diff --git a/lib/Slic3r/GUI/3DScene.pm b/lib/Slic3r/GUI/3DScene.pm
index c05de06c67..13460cfed2 100644
--- a/lib/Slic3r/GUI/3DScene.pm
+++ b/lib/Slic3r/GUI/3DScene.pm
@@ -1527,10 +1527,13 @@ sub draw_active_object_annotations {
     my ($reset_left, $reset_bottom, $reset_right, $reset_top) = $self->_variable_layer_thickness_reset_rect_viewport;
     my $z_cursor_relative = $self->_variable_layer_thickness_bar_mouse_cursor_z_relative;
 
+    my $print_object = $self->{print}->get_object($object_idx);
+    my $z_max = $print_object->model_object->bounding_box->z_max;
+    
     $self->{layer_height_edit_shader}->enable;
     $self->{layer_height_edit_shader}->set_uniform('z_to_texture_row',            $volume->layer_height_texture_z_to_row_id);
     $self->{layer_height_edit_shader}->set_uniform('z_texture_row_to_normalized', 1. / $volume->layer_height_texture_height);
-    $self->{layer_height_edit_shader}->set_uniform('z_cursor',                    $volume->bounding_box->z_max * $z_cursor_relative);
+    $self->{layer_height_edit_shader}->set_uniform('z_cursor',                    $z_max * $z_cursor_relative);
     $self->{layer_height_edit_shader}->set_uniform('z_cursor_band_width',         $self->{layer_height_edit_band_width});
     glBindTexture(GL_TEXTURE_2D, $self->{layer_preview_z_texture_id});
     glTexImage2D_c(GL_TEXTURE_2D, 0, GL_RGBA8, $volume->layer_height_texture_width, $volume->layer_height_texture_height, 
@@ -1552,8 +1555,8 @@ sub draw_active_object_annotations {
     glBegin(GL_QUADS);
     glVertex3f($bar_left,  $bar_bottom, 0);
     glVertex3f($bar_right, $bar_bottom, 0);
-    glVertex3f($bar_right, $bar_top, $volume->bounding_box->z_max);
-    glVertex3f($bar_left,  $bar_top, $volume->bounding_box->z_max);
+    glVertex3f($bar_right, $bar_top, $z_max);
+    glVertex3f($bar_left,  $bar_top, $z_max);
     glEnd();
     glBindTexture(GL_TEXTURE_2D, 0);
     $self->{layer_height_edit_shader}->disable;
@@ -1572,7 +1575,6 @@ sub draw_active_object_annotations {
 
     # Paint the graph.
     #FIXME show some kind of legend.
-    my $print_object = $self->{print}->get_object($object_idx);
     my $max_z = unscale($print_object->size->z);
     my $profile = $print_object->model_object->layer_height_profile;
     my $layer_height = $print_object->config->get('layer_height');
@@ -1677,6 +1679,11 @@ sub draw_warning {
     }
 }
 
+sub update_volumes_colors_by_extruder {
+    my ($self, $config) = @_;    
+    $self->volumes->update_colors_by_extruder($config);
+}
+
 sub opengl_info
 {
     my ($self, %params) = @_;
@@ -1823,7 +1830,6 @@ sub _fragment_shader_Gouraud {
     return <<'FRAGMENT';
 #version 110
 
-const vec4 OUTSIDE_COLOR = vec4(0.24, 0.42, 0.62, 1.0);
 const vec3 ZERO = vec3(0.0, 0.0, 0.0);
 
 // x = tainted, y = specular;
@@ -1836,11 +1842,9 @@ uniform vec4 uniform_color;
 
 void main()
 {
-    // if the fragment is outside the print volume use predefined color
-    vec4 color = (any(lessThan(delta_box_min, ZERO)) || any(greaterThan(delta_box_max, ZERO))) ? OUTSIDE_COLOR : uniform_color;
-
-    gl_FragColor = vec4(intensity.y, intensity.y, intensity.y, 0.0) + color * intensity.x;
-    gl_FragColor.a = color.a;
+    // if the fragment is outside the print volume -> use darker color
+    vec3 color = (any(lessThan(delta_box_min, ZERO)) || any(greaterThan(delta_box_max, ZERO))) ? mix(uniform_color.rgb, ZERO, 0.3333) : uniform_color.rgb;
+    gl_FragColor = vec4(vec3(intensity.y, intensity.y, intensity.y) + color * intensity.x, uniform_color.a);
 }
 
 FRAGMENT
@@ -1932,8 +1936,6 @@ const vec3 LIGHT_FRONT_DIR = vec3(0.6985074, 0.1397015, 0.6985074);
 
 #define INTENSITY_AMBIENT    0.3
 
-uniform float z_to_texture_row;
-
 // x = tainted, y = specular;
 varying vec2 intensity;
 
diff --git a/lib/Slic3r/GUI/Plater.pm b/lib/Slic3r/GUI/Plater.pm
index 89bbd45466..d59865491c 100644
--- a/lib/Slic3r/GUI/Plater.pm
+++ b/lib/Slic3r/GUI/Plater.pm
@@ -104,7 +104,6 @@ sub new {
         $self->{btn_reslice}->Enable($enable);
         $self->{btn_print}->Enable($enable);
         $self->{btn_send_gcode}->Enable($enable);
-        $self->{btn_export_stl}->Enable($enable);    
     };
     
     # Initialize 3D plater
@@ -737,8 +736,14 @@ sub load_model_objects {
         {
             # if the object is too large (more than 5 times the bed), scale it down
             my $size = $o->bounding_box->size;
-            my $ratio = max(@$size[X,Y]) / unscale(max(@$bed_size[X,Y]));
-            if ($ratio > 5) {
+            my $ratio = max($size->x / unscale($bed_size->x), $size->y / unscale($bed_size->y));
+            if ($ratio > 10000) {
+                # the size of the object is too big -> this could lead to overflow when moving to clipper coordinates,
+                # so scale down the mesh
+                $o->scale_xyz(Slic3r::Pointf3->new(1/$ratio, 1/$ratio, 1/$ratio));
+                $scaled_down = 1;
+            }
+            elsif ($ratio > 5) {
                 $_->set_scaling_factor(1/$ratio) for @{$o->instances};
                 $scaled_down = 1;
             }
@@ -1914,7 +1919,8 @@ sub object_list_changed {
     }
 
     my $export_in_progress = $self->{export_gcode_output_file} || $self->{send_gcode_file};
-    my $method = ($have_objects && ! $export_in_progress) ? 'Enable' : 'Disable';
+    my $model_fits = $self->{model}->fits_print_volume($self->{config});
+    my $method = ($have_objects && ! $export_in_progress && $model_fits) ? 'Enable' : 'Disable';
     $self->{"btn_$_"}->$method
         for grep $self->{"btn_$_"}, qw(reslice export_gcode print send_gcode);
 }
diff --git a/lib/Slic3r/GUI/Plater/3D.pm b/lib/Slic3r/GUI/Plater/3D.pm
index cffacfef47..dce60e2c44 100644
--- a/lib/Slic3r/GUI/Plater/3D.pm
+++ b/lib/Slic3r/GUI/Plater/3D.pm
@@ -217,6 +217,8 @@ sub reload_scene {
         }
     }
     
+    $self->update_volumes_colors_by_extruder($self->{config});
+    
     # checks for geometry outside the print volume to render it accordingly
     if (scalar @{$self->volumes} > 0)
     {
@@ -230,6 +232,9 @@ sub reload_scene {
             Slic3r::GUI::_3DScene::reset_warning_texture();
             $self->on_enable_action_buttons->(1) if ($self->on_enable_action_buttons);
         }
+    } else {
+        $self->set_warning_enabled(0);
+        Slic3r::GUI::_3DScene::reset_warning_texture();
     }
 }
 
diff --git a/lib/Slic3r/GUI/Plater/ObjectCutDialog.pm b/lib/Slic3r/GUI/Plater/ObjectCutDialog.pm
index 7712bd01d0..7b5752cd2b 100644
--- a/lib/Slic3r/GUI/Plater/ObjectCutDialog.pm
+++ b/lib/Slic3r/GUI/Plater/ObjectCutDialog.pm
@@ -60,7 +60,7 @@ sub new {
         label       => 'Z',
         default     => $self->{cut_options}{z},
         min         => 0,
-        max         => $self->{model_object}->bounding_box->size->z * $self->{model_object}->instances->[0]->scaling_factor,
+        max         => $self->{model_object}->bounding_box->size->z,
         full_width  => 1,
     ));
     {
@@ -247,6 +247,7 @@ sub _update {
                 $self->{cut_options}{z},
                 [@expolygons],
             );
+            $self->{canvas}->update_volumes_colors_by_extruder($self->GetParent->{config});
             $self->{canvas}->Render;
         }
     }
diff --git a/lib/Slic3r/GUI/Plater/ObjectPartsPanel.pm b/lib/Slic3r/GUI/Plater/ObjectPartsPanel.pm
index 8a8e6064c8..f7e38ed873 100644
--- a/lib/Slic3r/GUI/Plater/ObjectPartsPanel.pm
+++ b/lib/Slic3r/GUI/Plater/ObjectPartsPanel.pm
@@ -9,7 +9,7 @@ use utf8;
 use File::Basename qw(basename);
 use Wx qw(:misc :sizer :treectrl :button :keycode wxTAB_TRAVERSAL wxSUNKEN_BORDER wxBITMAP_TYPE_PNG wxID_CANCEL wxMOD_CONTROL
     wxTheApp);
-use Wx::Event qw(EVT_BUTTON EVT_TREE_ITEM_COLLAPSING EVT_TREE_SEL_CHANGED EVT_TREE_KEY_DOWN);
+use Wx::Event qw(EVT_BUTTON EVT_TREE_ITEM_COLLAPSING EVT_TREE_SEL_CHANGED EVT_TREE_KEY_DOWN EVT_KEY_DOWN);
 use base 'Wx::Panel';
 
 use constant ICON_OBJECT        => 0;
@@ -88,7 +88,7 @@ sub new {
     $self->{btn_move_down}->SetFont($Slic3r::GUI::small_font);
     
     # part settings panel
-    $self->{settings_panel} = Slic3r::GUI::Plater::OverrideSettingsPanel->new($self, on_change => sub { $self->{part_settings_changed} = 1; });
+    $self->{settings_panel} = Slic3r::GUI::Plater::OverrideSettingsPanel->new($self, on_change => sub { $self->{part_settings_changed} = 1; $self->_update_canvas; });
     my $settings_sizer = Wx::StaticBoxSizer->new($self->{staticbox} = Wx::StaticBox->new($self, -1, "Part Settings"), wxVERTICAL);
     $settings_sizer->Add($self->{settings_panel}, 1, wxEXPAND | wxALL, 0);
 
@@ -162,6 +162,7 @@ sub new {
         $canvas->load_object($self->{model_object}, undef, undef, [0]);
         $canvas->set_auto_bed_shape;
         $canvas->SetSize([500,700]);
+        $canvas->update_volumes_colors_by_extruder($self->GetParent->GetParent->GetParent->{config});
         $canvas->zoom_to_volumes;
     }
     
@@ -190,6 +191,14 @@ sub new {
     EVT_BUTTON($self, $self->{btn_split}, \&on_btn_split);
     EVT_BUTTON($self, $self->{btn_move_up}, \&on_btn_move_up);
     EVT_BUTTON($self, $self->{btn_move_down}, \&on_btn_move_down);
+    EVT_KEY_DOWN($canvas, sub {
+        my ($canvas, $event) = @_;
+        if ($event->GetKeyCode == WXK_DELETE) {
+            $canvas->GetParent->on_btn_delete;
+        } else {
+            $event->Skip;
+        }
+    });
     
     $self->reload_tree;
     
@@ -400,14 +409,17 @@ sub on_tree_key_down {
     my ($self, $event) = @_;
     my $keycode = $event->GetKeyCode;    
     # Wx >= 0.9911
-    if (defined(&Wx::TreeEvent::GetKeyEvent) && 
-        ($event->GetKeyEvent->GetModifiers & wxMOD_CONTROL)) {
-        if ($keycode == WXK_UP) {
-            $event->Skip;
-            $self->on_btn_move_up;
-        } elsif ($keycode == WXK_DOWN) {
-            $event->Skip;
-            $self->on_btn_move_down;
+    if (defined(&Wx::TreeEvent::GetKeyEvent)) { 
+        if ($event->GetKeyEvent->GetModifiers & wxMOD_CONTROL) {
+            if ($keycode == WXK_UP) {
+                $event->Skip;
+                $self->on_btn_move_up;
+            } elsif ($keycode == WXK_DOWN) {
+                $event->Skip;
+                $self->on_btn_move_down;
+            }
+        } elsif ($keycode == WXK_DELETE) {
+            $self->on_btn_delete;
         }
     }
 }
@@ -478,6 +490,7 @@ sub _parts_changed {
         $self->{canvas}->reset_objects;
         $self->{canvas}->load_object($self->{model_object});
         $self->{canvas}->zoom_to_volumes;
+        $self->{canvas}->update_volumes_colors_by_extruder($self->GetParent->GetParent->GetParent->{config});
         $self->{canvas}->Render;
     }
 }
@@ -508,6 +521,25 @@ sub PartSettingsChanged {
     return $self->{part_settings_changed};
 }
 
+sub _update_canvas {
+    my ($self) = @_;
+    
+    if ($self->{canvas}) {
+        $self->{canvas}->reset_objects;
+        $self->{canvas}->load_object($self->{model_object});
+
+        # restore selection, if any
+        if (my $itemData = $self->get_selection) {
+            if ($itemData->{type} eq 'volume') {
+                $self->{canvas}->volumes->[ $itemData->{volume_id} ]->set_selected(1);
+            }
+        }
+                
+        $self->{canvas}->update_volumes_colors_by_extruder($self->GetParent->GetParent->GetParent->{config});
+        $self->{canvas}->Render;
+    }
+}
+
 sub _update {
     my ($self) = @_;
     my ($m_x, $m_y, $m_z) = ($self->{move_options}{x}, $self->{move_options}{y}, $self->{move_options}{z});
@@ -528,6 +560,7 @@ sub _update {
     push @objects, $self->{model_object};
     $self->{canvas}->reset_objects;
     $self->{canvas}->load_object($_, undef, [0]) for @objects;
+    $self->{canvas}->update_volumes_colors_by_extruder($self->GetParent->GetParent->GetParent->{config});
     $self->{canvas}->Render;
 }
 
diff --git a/xs/src/libslic3r/Model.cpp b/xs/src/libslic3r/Model.cpp
index ad2ce54cd2..bda49421d0 100644
--- a/xs/src/libslic3r/Model.cpp
+++ b/xs/src/libslic3r/Model.cpp
@@ -16,6 +16,8 @@
 
 namespace Slic3r {
 
+    unsigned int Model::s_auto_extruder_id = 1;
+
 Model::Model(const Model &other)
 {
     // copy materials
@@ -405,10 +407,19 @@ void Model::convert_multipart_object()
     
     ModelObject* object = new ModelObject(this);
     object->input_file = this->objects.front()->input_file;
-    
+
+    reset_auto_extruder_id();
+
     for (const ModelObject* o : this->objects)
         for (const ModelVolume* v : o->volumes)
-            object->add_volume(*v)->name = o->name;
+        {
+            ModelVolume* new_v = object->add_volume(*v);
+            if (new_v != nullptr)
+            {
+                new_v->name = o->name;
+                new_v->config.set_deserialize("extruder", get_auto_extruder_id_as_string());
+            }
+        }
 
     for (const ModelInstance* i : this->objects.front()->instances)
         object->add_instance(*i);
@@ -466,6 +477,28 @@ bool Model::fits_print_volume(const FullPrintConfig &config) const
     return print_volume.contains(transformed_bounding_box());
 }
 
+unsigned int Model::get_auto_extruder_id()
+{
+    unsigned int id = s_auto_extruder_id;
+
+    if (++s_auto_extruder_id > 4)
+        reset_auto_extruder_id();
+
+    return id;
+}
+
+std::string Model::get_auto_extruder_id_as_string()
+{
+    char str_extruder[64];
+    sprintf(str_extruder, "%ud", get_auto_extruder_id());
+    return str_extruder;
+}
+
+void Model::reset_auto_extruder_id()
+{
+    s_auto_extruder_id = 1;
+}
+
 ModelObject::ModelObject(Model *model, const ModelObject &other, bool copy_volumes) :  
     name(other.name),
     input_file(other.input_file),
@@ -830,33 +863,9 @@ void ModelObject::cut(coordf_t z, Model* model) const
             lower->add_volume(*volume);
         } else {
             TriangleMesh upper_mesh, lower_mesh;
-            // TODO: shouldn't we use object bounding box instead of per-volume bb?
-            coordf_t cut_z = z + volume->mesh.bounding_box().min.z;
-            if (false) {
-//            if (volume->mesh.has_multiple_patches()) {
-                // Cutting algorithm does not work on intersecting meshes.
-                // As we are not sure whether the meshes don't intersect,
-                // we rather split the mesh into multiple non-intersecting pieces.
-                TriangleMeshPtrs meshptrs = volume->mesh.split();
-                for (TriangleMeshPtrs::iterator mesh = meshptrs.begin(); mesh != meshptrs.end(); ++mesh) {
-                    printf("Cutting mesh patch %d of %d\n", int(mesh - meshptrs.begin()), int(meshptrs.size()));
-                    (*mesh)->repair();
-                    TriangleMeshSlicer tms(*mesh);
-                    if (mesh == meshptrs.begin()) {
-                        tms.cut(cut_z, &upper_mesh, &lower_mesh);
-                    } else {
-                        TriangleMesh upper_mesh_this, lower_mesh_this;
-                        tms.cut(cut_z, &upper_mesh_this, &lower_mesh_this);
-                        upper_mesh.merge(upper_mesh_this);
-                        lower_mesh.merge(lower_mesh_this);
-                    }
-                    delete *mesh;
-                }
-            } else {
-                printf("Cutting mesh patch\n");
-                TriangleMeshSlicer tms(&volume->mesh);
-                tms.cut(cut_z, &upper_mesh, &lower_mesh);
-            }
+            printf("Cutting mesh patch\n");
+            TriangleMeshSlicer tms(&volume->mesh);
+            tms.cut(z, &upper_mesh, &lower_mesh);
 
             upper_mesh.repair();
             lower_mesh.repair();
@@ -995,6 +1004,9 @@ size_t ModelVolume::split()
     size_t idx = 0;
     size_t ivolume = std::find(this->object->volumes.begin(), this->object->volumes.end(), this) - this->object->volumes.begin();
     std::string name = this->name;
+
+    Model::reset_auto_extruder_id();
+
     for (TriangleMesh *mesh : meshptrs) {
         mesh->repair();
         if (idx == 0)
@@ -1004,6 +1016,7 @@ size_t ModelVolume::split()
         char str_idx[64];
         sprintf(str_idx, "_%d", idx + 1);
         this->object->volumes[ivolume]->name = name + str_idx;
+        this->object->volumes[ivolume]->config.set_deserialize("extruder", Model::get_auto_extruder_id_as_string());
         delete mesh;
         ++ idx;
     }
diff --git a/xs/src/libslic3r/Model.hpp b/xs/src/libslic3r/Model.hpp
index bf7f60e36c..0c0ffe7769 100644
--- a/xs/src/libslic3r/Model.hpp
+++ b/xs/src/libslic3r/Model.hpp
@@ -230,6 +230,8 @@ private:
 // all objects may share mutliple materials.
 class Model
 {
+    static unsigned int s_auto_extruder_id;
+
 public:
     // Materials are owned by a model and referenced by objects through t_model_material_id.
     // Single material may be shared by multiple models.
@@ -288,6 +290,10 @@ public:
     bool fits_print_volume(const FullPrintConfig &config) const;
 
     void print_info() const { for (const ModelObject *o : this->objects) o->print_info(); }
+
+    static unsigned int get_auto_extruder_id();
+    static std::string get_auto_extruder_id_as_string();
+    static void reset_auto_extruder_id();
 };
 
 }
diff --git a/xs/src/slic3r/GUI/3DScene.cpp b/xs/src/slic3r/GUI/3DScene.cpp
index 7298bc131f..aa86ae203f 100644
--- a/xs/src/slic3r/GUI/3DScene.cpp
+++ b/xs/src/slic3r/GUI/3DScene.cpp
@@ -9,6 +9,7 @@
 #include "../../libslic3r/GCode/PreviewData.hpp"
 #include "../../libslic3r/Print.hpp"
 #include "../../libslic3r/Slicing.hpp"
+#include "../../slic3r/GUI/PresetBundle.hpp"
 #include "GCode/Analyzer.hpp"
 
 #include <stdio.h>
@@ -304,7 +305,7 @@ void GLVolume::render_using_layer_height() const
         glUniform1f(z_texture_row_to_normalized_id, (GLfloat)(1.0f / layer_height_texture_height()));
 
     if (z_cursor_id >= 0)
-        glUniform1f(z_cursor_id, (GLfloat)(bounding_box.max.z * layer_height_texture_data.z_cursor_relative));
+        glUniform1f(z_cursor_id, (GLfloat)(layer_height_texture_data.print_object->model_object()->bounding_box().max.z * layer_height_texture_data.z_cursor_relative));
 
     if (z_cursor_band_width_id >= 0)
         glUniform1f(z_cursor_band_width_id, (GLfloat)layer_height_texture_data.edit_band_width);
@@ -326,6 +327,11 @@ void GLVolume::render_using_layer_height() const
         glUseProgram(current_program_id);
 }
 
+double GLVolume::layer_height_texture_z_to_row_id() const
+{
+    return (this->layer_height_texture.get() == nullptr) ? 0.0 : double(this->layer_height_texture->cells - 1) / (double(this->layer_height_texture->width) * this->layer_height_texture_data.print_object->model_object()->bounding_box().max.z);
+}
+
 void GLVolume::generate_layer_height_texture(PrintObject *print_object, bool force)
 {
     GLTexture *tex = this->layer_height_texture.get();
@@ -381,6 +387,15 @@ std::vector<int> GLVolumeCollection::load_object(
     std::vector<int> volumes_idx;
     for (int volume_idx = 0; volume_idx < int(model_object->volumes.size()); ++ volume_idx) {
         const ModelVolume *model_volume = model_object->volumes[volume_idx];
+
+        int extruder_id = -1;
+        if (!model_volume->modifier)
+        {
+            extruder_id = model_volume->config.has("extruder") ? model_volume->config.option("extruder")->getInt() : 0;
+            if (extruder_id == 0)
+                extruder_id = model_object->config.has("extruder") ? model_object->config.option("extruder")->getInt() : 0;
+        }
+
         for (int instance_idx : instance_idxs) {
             const ModelInstance *instance = model_object->instances[instance_idx];
             TriangleMesh mesh = model_volume->mesh;
@@ -410,8 +425,14 @@ std::vector<int> GLVolumeCollection::load_object(
                 v.drag_group_id = obj_idx * 1000;
             else if (drag_by == "instance")
                 v.drag_group_id = obj_idx * 1000 + instance_idx;
-            if (! model_volume->modifier)
+
+            if (!model_volume->modifier)
+            {
                 v.layer_height_texture = layer_height_texture;
+                if (extruder_id != -1)
+                    v.extruder_id = extruder_id;
+            }
+            v.is_modifier = model_volume->modifier;
         }
     }
     
@@ -443,6 +464,7 @@ int GLVolumeCollection::load_wipe_tower_preview(
     v.composite_id = obj_idx * 1000000;
     v.select_group_id = obj_idx * 1000000;
     v.drag_group_id = obj_idx * 1000;
+    v.is_wipe_tower = true;
     return int(this->volumes.size() - 1);
 }
 
@@ -647,6 +669,83 @@ void GLVolumeCollection::update_outside_state(const DynamicPrintConfig* config,
     }
 }
 
+void GLVolumeCollection::update_colors_by_extruder(const DynamicPrintConfig* config)
+{
+    static const float inv_255 = 1.0f / 255.0f;
+
+    struct Color
+    {
+        std::string text;
+        unsigned char rgb[3];
+
+        Color()
+            : text("")
+        {
+            rgb[0] = 255;
+            rgb[1] = 255;
+            rgb[2] = 255;
+        }
+
+        void set(const std::string& text, unsigned char* rgb)
+        {
+            this->text = text;
+            ::memcpy((void*)this->rgb, (const void*)rgb, 3 * sizeof(unsigned char));
+        }
+    };
+
+    if (config == nullptr)
+        return;
+
+    const ConfigOptionStrings* extruders_opt = dynamic_cast<const ConfigOptionStrings*>(config->option("extruder_colour"));
+    if (extruders_opt == nullptr)
+        return;
+
+    const ConfigOptionStrings* filamemts_opt = dynamic_cast<const ConfigOptionStrings*>(config->option("filament_colour"));
+    if (filamemts_opt == nullptr)
+        return;
+
+    unsigned int colors_count = std::max((unsigned int)extruders_opt->values.size(), (unsigned int)filamemts_opt->values.size());
+    if (colors_count == 0)
+        return;
+
+    std::vector<Color> colors(colors_count);
+
+    unsigned char rgb[3];
+    for (unsigned int i = 0; i < colors_count; ++i)
+    {
+        const std::string& txt_color = config->opt_string("extruder_colour", i);
+        if (PresetBundle::parse_color(txt_color, rgb))
+        {
+            colors[i].set(txt_color, rgb);
+        }
+        else
+        {
+            const std::string& txt_color = config->opt_string("filament_colour", i);
+            if (PresetBundle::parse_color(txt_color, rgb))
+                colors[i].set(txt_color, rgb);
+        }
+    }
+
+    for (GLVolume* volume : volumes)
+    {
+        if ((volume == nullptr) || volume->is_modifier || volume->is_wipe_tower)
+            continue;
+
+        int extruder_id = volume->extruder_id - 1;
+        if ((extruder_id < 0) || ((unsigned int)colors.size() <= extruder_id))
+            extruder_id = 0;
+
+        const Color& color = colors[extruder_id];
+        if (!color.text.empty())
+        {
+            for (int i = 0; i < 3; ++i)
+            {
+                volume->color[i] = (float)color.rgb[i] * inv_255;
+            }
+        }
+    }
+}
+
 std::vector<double> GLVolumeCollection::get_current_print_zs() const
 {
     // Collect layer top positions of all volumes.
diff --git a/xs/src/slic3r/GUI/3DScene.hpp b/xs/src/slic3r/GUI/3DScene.hpp
index f94dda0661..8f03e47746 100644
--- a/xs/src/slic3r/GUI/3DScene.hpp
+++ b/xs/src/slic3r/GUI/3DScene.hpp
@@ -246,12 +246,15 @@ public:
         composite_id(-1),
         select_group_id(-1),
         drag_group_id(-1),
+        extruder_id(0),
         selected(false),
         is_active(true),
         zoom_to_volumes(true),
         outside_printer_detection_enabled(true),
         is_outside(false),
         hover(false),
+        is_modifier(false),
+        is_wipe_tower(false),
         tverts_range(0, size_t(-1)),
         qverts_range(0, size_t(-1))
     {
@@ -287,6 +290,8 @@ public:
     int                 select_group_id;
     // An ID for group dragging. It may be the same for all meshes of all object instances, or for just a single object instance.
     int                 drag_group_id;
+    // An ID containing the extruder ID (used to select color).
+    int                 extruder_id;
     // Is this object selected?
     bool                selected;
     // Whether or not this volume is active for rendering
@@ -299,6 +304,10 @@ public:
     bool                is_outside;
     // Boolean: Is mouse over this object?
     bool                hover;
+    // Wheter or not this volume has been generated from a modifier
+    bool                 is_modifier;
+    // Wheter or not this volume has been generated from the wipe tower
+    bool                 is_wipe_tower;
 
     // Interleaved triangles & normals with indexed triangles & quads.
     GLIndexedVertexArray        indexed_vertex_array;
@@ -352,10 +361,7 @@ public:
         return (layer_height_texture.get() == nullptr) ? 0 :
             (void*)(layer_height_texture->data.data() + layer_height_texture->width * layer_height_texture->height * 4);
     }
-    double              layer_height_texture_z_to_row_id() const { 
-        return (this->layer_height_texture.get() == nullptr) ? 0. : 
-            double(this->layer_height_texture->cells - 1) / (double(this->layer_height_texture->width) * bounding_box.max.z);
-    }
+    double              layer_height_texture_z_to_row_id() const;
     void                generate_layer_height_texture(PrintObject *print_object, bool force);
 
     void set_layer_height_texture_data(unsigned int texture_id, unsigned int shader_id, PrintObject* print_object, float z_cursor_relative, float edit_band_width)
@@ -417,6 +423,7 @@ public:
     }
 
     void update_outside_state(const DynamicPrintConfig* config, bool all_inside);
+    void update_colors_by_extruder(const DynamicPrintConfig* config);
 
     // 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() const;
diff --git a/xs/src/slic3r/GUI/PresetBundle.cpp b/xs/src/slic3r/GUI/PresetBundle.cpp
index e80c9ce48f..207968f1b5 100644
--- a/xs/src/slic3r/GUI/PresetBundle.cpp
+++ b/xs/src/slic3r/GUI/PresetBundle.cpp
@@ -990,7 +990,7 @@ static inline int hex_digit_to_int(const char c)
         (c >= 'a' && c <= 'f') ? int(c - 'a') + 10 : -1;
 }
 
-static inline bool parse_color(const std::string &scolor, unsigned char *rgb_out)
+bool PresetBundle::parse_color(const std::string &scolor, unsigned char *rgb_out)
 {
     rgb_out[0] = rgb_out[1] = rgb_out[2] = 0;
     if (scolor.size() != 7 || scolor.front() != '#')
diff --git a/xs/src/slic3r/GUI/PresetBundle.hpp b/xs/src/slic3r/GUI/PresetBundle.hpp
index 8e89590ac9..c0307c977c 100644
--- a/xs/src/slic3r/GUI/PresetBundle.hpp
+++ b/xs/src/slic3r/GUI/PresetBundle.hpp
@@ -117,6 +117,8 @@ public:
     // preset if the current print or filament preset is not compatible.
     void                        update_compatible_with_printer(bool select_other_if_incompatible);
 
+    static bool parse_color(const std::string &scolor, unsigned char *rgb_out);
+
 private:
     std::string                 load_system_presets();
 
diff --git a/xs/xsp/GUI_3DScene.xsp b/xs/xsp/GUI_3DScene.xsp
index 915d964d13..86d0aeba29 100644
--- a/xs/xsp/GUI_3DScene.xsp
+++ b/xs/xsp/GUI_3DScene.xsp
@@ -105,6 +105,7 @@
 
     void set_print_box(float min_x, float min_y, float min_z, float max_x, float max_y, float max_z);
     void update_outside_state(DynamicPrintConfig* config, bool all_inside);
+    void update_colors_by_extruder(DynamicPrintConfig* config);
 
     bool move_volume_up(int idx)
         %code%{