diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 9e2f69ca0..2c383c540 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -3724,7 +3724,7 @@ std::vector<int> GLCanvas3D::load_object(const Model& model, int obj_idx)
 void GLCanvas3D::mirror_selection(Axis axis)
 {
     m_selection.mirror(axis);
-    _on_mirror();
+    do_mirror();
     wxGetApp().obj_manipul()->update_settings_value(m_selection);
 }
 
@@ -4318,7 +4318,7 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
         case Gizmos::Scale:
         {
             m_selection.scale(m_gizmos.get_scale(), false);
-            _on_scale();
+            do_scale();
             wxGetApp().obj_manipul()->update_settings_value(m_selection);
             m_dirty = true;
             break;
@@ -4326,7 +4326,7 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
         case Gizmos::Rotate:
         {
             m_selection.rotate(m_gizmos.get_rotation(), false);
-            _on_rotate();
+            do_rotate();
             wxGetApp().obj_manipul()->update_settings_value(m_selection);
             m_dirty = true;
             break;
@@ -4390,7 +4390,7 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
             if (m_gizmos.get_current_type() == Gizmos::Flatten) {
                 // Rotate the object so the normal points downward:
                 m_selection.flattening_rotate(m_gizmos.get_flattening_normal());
-                _on_flatten();
+                do_flatten();
                 wxGetApp().obj_manipul()->update_settings_value(m_selection);
             }
 
@@ -4613,7 +4613,7 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
         else if ((m_mouse.drag.move_volume_idx != -1) && m_mouse.dragging)
         {
             m_regenerate_volumes = false;
-            _on_move();
+            do_move();
             wxGetApp().obj_manipul()->update_settings_value(m_selection);
         }
         else if (m_gizmos.get_current_type() == Gizmos::SlaSupports && m_hover_volume_id != -1)
@@ -4651,17 +4651,17 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
             case Gizmos::Move:
             {
                 m_regenerate_volumes = false;
-                _on_move();
+                do_move();
                 break;
             }
             case Gizmos::Scale:
             {
-                _on_scale();
+                do_scale();
                 break;
             }
             case Gizmos::Rotate:
             {
-                _on_rotate();
+                do_rotate();
                 break;
             }
             default:
@@ -4770,6 +4770,232 @@ void GLCanvas3D::set_external_gizmo_widgets_parent(wxWindow *parent)
     m_external_gizmo_widgets_parent = parent;
 }
 
+void GLCanvas3D::do_move()
+{
+    if (m_model == nullptr)
+        return;
+
+    std::set<std::pair<int, int>> done;  // keeps track of modified instances
+    bool object_moved = false;
+    Vec3d wipe_tower_origin = Vec3d::Zero();
+
+    Selection::EMode selection_mode = m_selection.get_mode();
+
+    for (const GLVolume* v : m_volumes.volumes)
+    {
+        int object_idx = v->object_idx();
+        int instance_idx = v->instance_idx();
+        int volume_idx = v->volume_idx();
+
+        std::pair<int, int> done_id(object_idx, instance_idx);
+
+        if ((0 <= object_idx) && (object_idx < (int)m_model->objects.size()))
+        {
+            done.insert(done_id);
+
+            // Move instances/volumes
+            ModelObject* model_object = m_model->objects[object_idx];
+            if (model_object != nullptr)
+            {
+#if ENABLE_MODELVOLUME_TRANSFORM
+                if (selection_mode == Selection::Instance)
+                {
+                    model_object->instances[instance_idx]->set_offset(v->get_instance_offset());
+                    object_moved = true;
+                }
+                else if (selection_mode == Selection::Volume)
+                {
+                    model_object->volumes[volume_idx]->set_offset(v->get_volume_offset());
+                    object_moved = true;
+                }
+                if (object_moved)
+#else
+                model_object->instances[instance_idx]->set_offset(v->get_offset());
+                object_moved = true;
+#endif // ENABLE_MODELVOLUME_TRANSFORM
+                model_object->invalidate_bounding_box();
+            }
+        }
+        else if (object_idx == 1000)
+            // Move a wipe tower proxy.
+#if ENABLE_MODELVOLUME_TRANSFORM
+            wipe_tower_origin = v->get_volume_offset();
+#else
+            wipe_tower_origin = v->get_offset();
+#endif // ENABLE_MODELVOLUME_TRANSFORM
+    }
+
+    // Fixes sinking/flying instances
+    for (const std::pair<int, int>& i : done)
+    {
+        ModelObject* m = m_model->objects[i.first];
+        Vec3d shift(0.0, 0.0, -m->get_instance_min_z(i.second));
+        m_selection.translate(i.first, i.second, shift);
+        m->translate_instance(i.second, shift);
+    }
+
+    if (object_moved)
+        post_event(SimpleEvent(EVT_GLCANVAS_INSTANCE_MOVED));
+
+    if (wipe_tower_origin != Vec3d::Zero())
+        post_event(Vec3dEvent(EVT_GLCANVAS_WIPETOWER_MOVED, std::move(wipe_tower_origin)));
+}
+
+void GLCanvas3D::do_rotate()
+{
+    if (m_model == nullptr)
+        return;
+
+    std::set<std::pair<int, int>> done;  // keeps track of modified instances
+
+    Selection::EMode selection_mode = m_selection.get_mode();
+
+    for (const GLVolume* v : m_volumes.volumes)
+    {
+        int object_idx = v->object_idx();
+        if ((object_idx < 0) || ((int)m_model->objects.size() <= object_idx))
+            continue;
+
+        int instance_idx = v->instance_idx();
+        int volume_idx = v->volume_idx();
+
+        done.insert(std::pair<int, int>(object_idx, instance_idx));
+
+        // Rotate instances/volumes.
+        ModelObject* model_object = m_model->objects[object_idx];
+        if (model_object != nullptr)
+        {
+#if ENABLE_MODELVOLUME_TRANSFORM
+            if (selection_mode == Selection::Instance)
+            {
+                model_object->instances[instance_idx]->set_rotation(v->get_instance_rotation());
+                model_object->instances[instance_idx]->set_offset(v->get_instance_offset());
+            }
+            else if (selection_mode == Selection::Volume)
+            {
+                model_object->volumes[volume_idx]->set_rotation(v->get_volume_rotation());
+                model_object->volumes[volume_idx]->set_offset(v->get_volume_offset());
+            }
+#else
+            model_object->instances[instance_idx]->set_rotation(v->get_rotation());
+            model_object->instances[instance_idx]->set_offset(v->get_offset());
+#endif // ENABLE_MODELVOLUME_TRANSFORM
+            model_object->invalidate_bounding_box();
+        }
+    }
+
+    // Fixes sinking/flying instances
+    for (const std::pair<int, int>& i : done)
+    {
+        ModelObject* m = m_model->objects[i.first];
+        Vec3d shift(0.0, 0.0, -m->get_instance_min_z(i.second));
+        m_selection.translate(i.first, i.second, shift);
+        m->translate_instance(i.second, shift);
+    }
+
+    post_event(SimpleEvent(EVT_GLCANVAS_SCHEDULE_BACKGROUND_PROCESS));
+}
+
+void GLCanvas3D::do_scale()
+{
+    if (m_model == nullptr)
+        return;
+
+    std::set<std::pair<int, int>> done;  // keeps track of modified instances
+
+    Selection::EMode selection_mode = m_selection.get_mode();
+
+    for (const GLVolume* v : m_volumes.volumes)
+    {
+        int object_idx = v->object_idx();
+        if ((object_idx < 0) || ((int)m_model->objects.size() <= object_idx))
+            continue;
+
+        int instance_idx = v->instance_idx();
+        int volume_idx = v->volume_idx();
+
+        done.insert(std::pair<int, int>(object_idx, instance_idx));
+
+        // Rotate instances/volumes
+        ModelObject* model_object = m_model->objects[object_idx];
+        if (model_object != nullptr)
+        {
+#if ENABLE_MODELVOLUME_TRANSFORM
+            if (selection_mode == Selection::Instance)
+            {
+                model_object->instances[instance_idx]->set_scaling_factor(v->get_instance_scaling_factor());
+                model_object->instances[instance_idx]->set_offset(v->get_instance_offset());
+            }
+            else if (selection_mode == Selection::Volume)
+            {
+                model_object->instances[instance_idx]->set_offset(v->get_instance_offset());
+                model_object->volumes[volume_idx]->set_scaling_factor(v->get_volume_scaling_factor());
+                model_object->volumes[volume_idx]->set_offset(v->get_volume_offset());
+            }
+#else
+            model_object->instances[instance_idx]->set_scaling_factor(v->get_scaling_factor());
+            model_object->instances[instance_idx]->set_offset(v->get_offset());
+#endif // ENABLE_MODELVOLUME_TRANSFORM
+            model_object->invalidate_bounding_box();
+        }
+    }
+
+    // Fixes sinking/flying instances
+    for (const std::pair<int, int>& i : done)
+    {
+        ModelObject* m = m_model->objects[i.first];
+        Vec3d shift(0.0, 0.0, -m->get_instance_min_z(i.second));
+        m_selection.translate(i.first, i.second, shift);
+        m->translate_instance(i.second, shift);
+    }
+
+    post_event(SimpleEvent(EVT_GLCANVAS_SCHEDULE_BACKGROUND_PROCESS));
+}
+
+void GLCanvas3D::do_flatten()
+{
+    do_rotate();
+}
+
+void GLCanvas3D::do_mirror()
+{
+    if (m_model == nullptr)
+        return;
+
+    std::set<std::pair<int, int>> done;  // keeps track of modified instances
+
+    Selection::EMode selection_mode = m_selection.get_mode();
+
+    for (const GLVolume* v : m_volumes.volumes)
+    {
+        int object_idx = v->object_idx();
+        if ((object_idx < 0) || ((int)m_model->objects.size() <= object_idx))
+            continue;
+
+        int instance_idx = v->instance_idx();
+        int volume_idx = v->volume_idx();
+
+        done.insert(std::pair<int, int>(object_idx, instance_idx));
+
+        // Mirror instances/volumes
+        ModelObject* model_object = m_model->objects[object_idx];
+        if (model_object != nullptr)
+        {
+#if ENABLE_MODELVOLUME_TRANSFORM
+            if (selection_mode == Selection::Instance)
+                model_object->instances[instance_idx]->set_mirror(v->get_instance_mirror());
+            else if (selection_mode == Selection::Volume)
+                model_object->volumes[volume_idx]->set_mirror(v->get_volume_mirror());
+#else
+            model_object->instances[instance_idx]->set_mirror(v->get_mirror());
+#endif // ENABLE_MODELVOLUME_TRANSFORM
+            model_object->invalidate_bounding_box();
+        }
+    }
+
+    post_event(SimpleEvent(EVT_GLCANVAS_SCHEDULE_BACKGROUND_PROCESS));
+}
+
 bool GLCanvas3D::_is_shown_on_screen() const
 {
     return (m_canvas != nullptr) ? m_canvas->IsShownOnScreen() : false;
@@ -6616,232 +6842,6 @@ void GLCanvas3D::_show_warning_texture_if_needed()
     }
 }
 
-void GLCanvas3D::_on_move()
-{
-    if (m_model == nullptr)
-        return;
-
-    std::set<std::pair<int, int>> done;  // keeps track of modified instances
-    bool object_moved = false;
-    Vec3d wipe_tower_origin = Vec3d::Zero();
-
-    Selection::EMode selection_mode = m_selection.get_mode();
-
-    for (const GLVolume* v : m_volumes.volumes)
-    {
-        int object_idx = v->object_idx();
-        int instance_idx = v->instance_idx();
-        int volume_idx = v->volume_idx();
-
-        std::pair<int, int> done_id(object_idx, instance_idx);
-
-        if ((0 <= object_idx) && (object_idx < (int)m_model->objects.size()))
-        {
-            done.insert(done_id);
-
-            // Move instances/volumes
-            ModelObject* model_object = m_model->objects[object_idx];
-            if (model_object != nullptr)
-            {
-#if ENABLE_MODELVOLUME_TRANSFORM
-                if (selection_mode == Selection::Instance)
-                {
-                    model_object->instances[instance_idx]->set_offset(v->get_instance_offset());
-                    object_moved = true;
-                }
-                else if (selection_mode == Selection::Volume)
-                {
-                    model_object->volumes[volume_idx]->set_offset(v->get_volume_offset());
-                    object_moved = true;
-                }
-                if (object_moved)
-#else
-                model_object->instances[instance_idx]->set_offset(v->get_offset());
-                object_moved = true;
-#endif // ENABLE_MODELVOLUME_TRANSFORM
-                model_object->invalidate_bounding_box();
-            }
-        }
-        else if (object_idx == 1000)
-            // Move a wipe tower proxy.
-#if ENABLE_MODELVOLUME_TRANSFORM
-            wipe_tower_origin = v->get_volume_offset();
-#else
-            wipe_tower_origin = v->get_offset();
-#endif // ENABLE_MODELVOLUME_TRANSFORM
-    }
-
-    // Fixes sinking/flying instances
-    for (const std::pair<int, int>& i : done)
-    {
-        ModelObject* m = m_model->objects[i.first];
-        Vec3d shift(0.0, 0.0, -m->get_instance_min_z(i.second));
-        m_selection.translate(i.first, i.second, shift);
-        m->translate_instance(i.second, shift);
-    }
-
-    if (object_moved)
-        post_event(SimpleEvent(EVT_GLCANVAS_INSTANCE_MOVED));
-
-    if (wipe_tower_origin != Vec3d::Zero())
-        post_event(Vec3dEvent(EVT_GLCANVAS_WIPETOWER_MOVED, std::move(wipe_tower_origin)));
-}
-
-void GLCanvas3D::_on_rotate()
-{
-    if (m_model == nullptr)
-        return;
-
-    std::set<std::pair<int, int>> done;  // keeps track of modified instances
-
-    Selection::EMode selection_mode = m_selection.get_mode();
-    
-    for (const GLVolume* v : m_volumes.volumes)
-    {
-        int object_idx = v->object_idx();
-        if ((object_idx < 0) || ((int)m_model->objects.size() <= object_idx))
-            continue;
-
-        int instance_idx = v->instance_idx();
-        int volume_idx = v->volume_idx();
-
-        done.insert(std::pair<int, int>(object_idx, instance_idx));
-
-        // Rotate instances/volumes.
-        ModelObject* model_object = m_model->objects[object_idx];
-        if (model_object != nullptr)
-        {
-#if ENABLE_MODELVOLUME_TRANSFORM
-            if (selection_mode == Selection::Instance)
-            {
-                model_object->instances[instance_idx]->set_rotation(v->get_instance_rotation());
-                model_object->instances[instance_idx]->set_offset(v->get_instance_offset());
-            }
-            else if (selection_mode == Selection::Volume)
-            {
-                model_object->volumes[volume_idx]->set_rotation(v->get_volume_rotation());
-                model_object->volumes[volume_idx]->set_offset(v->get_volume_offset());
-            }
-#else
-            model_object->instances[instance_idx]->set_rotation(v->get_rotation());
-            model_object->instances[instance_idx]->set_offset(v->get_offset());
-#endif // ENABLE_MODELVOLUME_TRANSFORM
-            model_object->invalidate_bounding_box();
-        }
-    }
-
-    // Fixes sinking/flying instances
-    for (const std::pair<int, int>& i : done)
-    {
-        ModelObject* m = m_model->objects[i.first];
-        Vec3d shift(0.0, 0.0, -m->get_instance_min_z(i.second));
-        m_selection.translate(i.first, i.second, shift);
-        m->translate_instance(i.second, shift);
-    }
-
-    post_event(SimpleEvent(EVT_GLCANVAS_SCHEDULE_BACKGROUND_PROCESS));
-}
-
-void GLCanvas3D::_on_scale()
-{
-    if (m_model == nullptr)
-        return;
-
-    std::set<std::pair<int, int>> done;  // keeps track of modified instances
-
-    Selection::EMode selection_mode = m_selection.get_mode();
-
-    for (const GLVolume* v : m_volumes.volumes)
-    {
-        int object_idx = v->object_idx();
-        if ((object_idx < 0) || ((int)m_model->objects.size() <= object_idx))
-            continue;
-
-        int instance_idx = v->instance_idx();
-        int volume_idx = v->volume_idx();
-
-        done.insert(std::pair<int, int>(object_idx, instance_idx));
-
-        // Rotate instances/volumes
-        ModelObject* model_object = m_model->objects[object_idx];
-        if (model_object != nullptr)
-        {
-#if ENABLE_MODELVOLUME_TRANSFORM
-            if (selection_mode == Selection::Instance)
-            {
-                model_object->instances[instance_idx]->set_scaling_factor(v->get_instance_scaling_factor());
-                model_object->instances[instance_idx]->set_offset(v->get_instance_offset());
-            }
-            else if (selection_mode == Selection::Volume)
-            {
-                model_object->instances[instance_idx]->set_offset(v->get_instance_offset());
-                model_object->volumes[volume_idx]->set_scaling_factor(v->get_volume_scaling_factor());
-                model_object->volumes[volume_idx]->set_offset(v->get_volume_offset());
-            }
-#else
-            model_object->instances[instance_idx]->set_scaling_factor(v->get_scaling_factor());
-            model_object->instances[instance_idx]->set_offset(v->get_offset());
-#endif // ENABLE_MODELVOLUME_TRANSFORM
-            model_object->invalidate_bounding_box();
-        }
-    }
-
-    // Fixes sinking/flying instances
-    for (const std::pair<int, int>& i : done)
-    {
-        ModelObject* m = m_model->objects[i.first];
-        Vec3d shift(0.0, 0.0, -m->get_instance_min_z(i.second));
-        m_selection.translate(i.first, i.second, shift);
-        m->translate_instance(i.second, shift);
-    }
-
-    post_event(SimpleEvent(EVT_GLCANVAS_SCHEDULE_BACKGROUND_PROCESS));
-}
-
-void GLCanvas3D::_on_flatten()
-{
-    _on_rotate();
-}
-
-void GLCanvas3D::_on_mirror()
-{
-    if (m_model == nullptr)
-        return;
-
-    std::set<std::pair<int, int>> done;  // keeps track of modified instances
-
-    Selection::EMode selection_mode = m_selection.get_mode();
-
-    for (const GLVolume* v : m_volumes.volumes)
-    {
-        int object_idx = v->object_idx();
-        if ((object_idx < 0) || ((int)m_model->objects.size() <= object_idx))
-            continue;
-
-        int instance_idx = v->instance_idx();
-        int volume_idx = v->volume_idx();
-
-        done.insert(std::pair<int, int>(object_idx, instance_idx));
-
-        // Mirror instances/volumes
-        ModelObject* model_object = m_model->objects[object_idx];
-        if (model_object != nullptr)
-        {
-#if ENABLE_MODELVOLUME_TRANSFORM
-            if (selection_mode == Selection::Instance)
-                model_object->instances[instance_idx]->set_mirror(v->get_instance_mirror());
-            else if (selection_mode == Selection::Volume)
-                model_object->volumes[volume_idx]->set_mirror(v->get_volume_mirror());
-#else
-            model_object->instances[instance_idx]->set_mirror(v->get_mirror());
-#endif // ENABLE_MODELVOLUME_TRANSFORM
-            model_object->invalidate_bounding_box();
-        }
-    }
-
-    post_event(SimpleEvent(EVT_GLCANVAS_SCHEDULE_BACKGROUND_PROCESS));
-}
-
 std::vector<float> GLCanvas3D::_parse_colors(const std::vector<std::string>& colors)
 {
     static const float INV_255 = 1.0f / 255.0f;
diff --git a/src/slic3r/GUI/GLCanvas3D.hpp b/src/slic3r/GUI/GLCanvas3D.hpp
index 4e7a2034a..1b6b0a6e5 100644
--- a/src/slic3r/GUI/GLCanvas3D.hpp
+++ b/src/slic3r/GUI/GLCanvas3D.hpp
@@ -846,6 +846,12 @@ public:
 
     void set_external_gizmo_widgets_parent(wxWindow *parent);
 
+    void do_move();
+    void do_rotate();
+    void do_scale();
+    void do_flatten();
+    void do_mirror();
+
 private:
     bool _is_shown_on_screen() const;
     void _force_zoom_to_bed();
@@ -929,13 +935,7 @@ private:
     void _update_gcode_volumes_visibility(const GCodePreviewData& preview_data);
     void _update_toolpath_volumes_outside_state();
     void _show_warning_texture_if_needed();
-public:
-    void _on_move();
-    void _on_rotate();
-    void _on_scale();
-    void _on_flatten();
-    void _on_mirror();
-private:
+
     // 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/src/slic3r/GUI/GUI_ObjectManipulation.cpp b/src/slic3r/GUI/GUI_ObjectManipulation.cpp
index 9be081e53..d430f3d2d 100644
--- a/src/slic3r/GUI/GUI_ObjectManipulation.cpp
+++ b/src/slic3r/GUI/GUI_ObjectManipulation.cpp
@@ -404,7 +404,7 @@ void ObjectManipulation::change_position_value(const Vec3d& position)
     auto canvas = _3DScene::get_canvas(wxGetApp().canvas3D());
     canvas->get_selection().start_dragging();
     canvas->get_selection().translate(displacement);
-    canvas->_on_move();
+    canvas->do_move();
 
     cache_position = position;
 }
@@ -417,7 +417,7 @@ void ObjectManipulation::change_rotation_value(const Vec3d& rotation)
     auto canvas = _3DScene::get_canvas(wxGetApp().canvas3D());
     canvas->get_selection().start_dragging();
     canvas->get_selection().rotate(rad_rotation, false);
-    canvas->_on_rotate();
+    canvas->do_rotate();
 }
 
 void ObjectManipulation::change_scale_value(const Vec3d& scale)
@@ -437,7 +437,7 @@ void ObjectManipulation::change_scale_value(const Vec3d& scale)
     auto canvas = _3DScene::get_canvas(wxGetApp().canvas3D());
     canvas->get_selection().start_dragging();
     canvas->get_selection().scale(scaling_factor, false);
-    canvas->_on_scale();
+    canvas->do_scale();
 }
 
 void ObjectManipulation::print_cashe_value(const std::string& label, const Vec3d& v)