diff --git a/src/libslic3r/MTUtils.hpp b/src/libslic3r/MTUtils.hpp
index f07e8832d..3001c27ff 100644
--- a/src/libslic3r/MTUtils.hpp
+++ b/src/libslic3r/MTUtils.hpp
@@ -1,7 +1,7 @@
 #ifndef MTUTILS_HPP
 #define MTUTILS_HPP
 
-#include <atomic>       // for std::atomic_flag
+#include <atomic>       // for std::atomic_flag and memory orders
 #include <mutex>        // for std::lock_guard
 #include <functional>   // for std::function
 #include <utility>      // for std::forward
@@ -44,7 +44,7 @@ public:
 
     // invalidate the value of the object. The object will be refreshed at the
     // next retrieval (Setter will be called). The data that is used in
-    // the setter function should be guarded as well if it is modified so the
+    // the setter function should be guarded as well during modification so the
     // modification has to take place in fn.
     inline void invalidate(std::function<void()> fn) {
         std::lock_guard<SpinMutex> lck(m_lck); fn(); m_valid = false;
diff --git a/src/libslic3r/Model.cpp b/src/libslic3r/Model.cpp
index 3801c5b12..3aa04f3b2 100644
--- a/src/libslic3r/Model.cpp
+++ b/src/libslic3r/Model.cpp
@@ -1051,9 +1051,6 @@ void ModelObject::split(ModelObjectPtrs* new_objects)
     ModelVolume* volume = this->volumes.front();
     TriangleMeshPtrs meshptrs = volume->mesh.split();
     for (TriangleMesh *mesh : meshptrs) {
-        // Snap the mesh to Z=0.
-        float z0 = FLT_MAX;
-        
         mesh->repair();
         
         // XXX: this seems to be the only real usage of m_model, maybe refactor this so that it's not needed?
@@ -1063,7 +1060,20 @@ void ModelObject::split(ModelObjectPtrs* new_objects)
 		new_object->instances.reserve(this->instances.size());
 		for (const ModelInstance *model_instance : this->instances)
 			new_object->add_instance(*model_instance);
+#if ENABLE_MODELVOLUME_TRANSFORM
+        ModelVolume* new_vol = new_object->add_volume(*volume, std::move(*mesh));
+        new_vol->center_geometry();
+
+        for (ModelInstance* model_instance : new_object->instances)
+        {
+            Vec3d shift = model_instance->get_transformation().get_matrix(true) * new_vol->get_offset();
+            model_instance->set_offset(model_instance->get_offset() + shift);
+        }
+
+        new_vol->set_offset(Vec3d::Zero());
+#else
         new_object->add_volume(*volume, std::move(*mesh));
+#endif // ENABLE_MODELVOLUME_TRANSFORM
         new_objects->emplace_back(new_object);
         delete mesh;
     }
diff --git a/src/libslic3r/ModelArrange.hpp b/src/libslic3r/ModelArrange.hpp
index 78a400667..d62e0df30 100644
--- a/src/libslic3r/ModelArrange.hpp
+++ b/src/libslic3r/ModelArrange.hpp
@@ -20,9 +20,6 @@ public:
     inline double radius() const { return radius_; }
     inline const Point& center() const { return center_; }
     inline operator bool() { return !std::isnan(radius_); }
-//    inline operator lnCircle() {
-//        return lnCircle({center_(0), center_(1)}, radius_);
-//    }
 };
 
 enum class BedShapeType {
diff --git a/src/slic3r/GUI/3DScene.cpp b/src/slic3r/GUI/3DScene.cpp
index 486f7286c..b6b5691a1 100644
--- a/src/slic3r/GUI/3DScene.cpp
+++ b/src/slic3r/GUI/3DScene.cpp
@@ -2050,6 +2050,11 @@ void _3DScene::delete_selected(wxGLCanvas* canvas)
     s_canvas_mgr.delete_selected(canvas);
 }
 
+void _3DScene::ensure_on_bed(wxGLCanvas* canvas, unsigned int object_idx)
+{
+    s_canvas_mgr.ensure_on_bed(canvas, object_idx);
+}
+
 std::vector<double> _3DScene::get_current_print_zs(wxGLCanvas* canvas, bool active_only)
 {
     return s_canvas_mgr.get_current_print_zs(canvas, active_only);
@@ -2102,9 +2107,9 @@ void _3DScene::mirror_selection(wxGLCanvas* canvas, Axis axis)
     s_canvas_mgr.mirror_selection(canvas, axis);
 }
 
-void _3DScene::reload_scene(wxGLCanvas* canvas, bool force)
+void _3DScene::reload_scene(wxGLCanvas* canvas, bool refresh_immediately, bool force_full_scene_refresh)
 {
-    s_canvas_mgr.reload_scene(canvas, force);
+    s_canvas_mgr.reload_scene(canvas, refresh_immediately, force_full_scene_refresh);
 }
 
 void _3DScene::load_gcode_preview(wxGLCanvas* canvas, const GCodePreviewData* preview_data, const std::vector<std::string>& str_tool_colors)
diff --git a/src/slic3r/GUI/3DScene.hpp b/src/slic3r/GUI/3DScene.hpp
index 6ebb6def0..7fdb845cf 100644
--- a/src/slic3r/GUI/3DScene.hpp
+++ b/src/slic3r/GUI/3DScene.hpp
@@ -634,6 +634,7 @@ public:
     static void render(wxGLCanvas* canvas);
 
     static void delete_selected(wxGLCanvas* canvas);
+    static void ensure_on_bed(wxGLCanvas* canvas, unsigned int object_idx);
 
     static std::vector<double> get_current_print_zs(wxGLCanvas* canvas, bool active_only);
     static void set_toolpaths_range(wxGLCanvas* canvas, double low, double high);
@@ -643,7 +644,7 @@ public:
 
     static void mirror_selection(wxGLCanvas* canvas, Axis axis);
 
-    static void reload_scene(wxGLCanvas* canvas, bool force);
+    static void reload_scene(wxGLCanvas* canvas, bool refresh_immediately, bool force_full_scene_refresh = false);
 
     static void load_gcode_preview(wxGLCanvas* canvas, const GCodePreviewData* preview_data, const std::vector<std::string>& str_tool_colors);
     static void load_preview(wxGLCanvas* canvas, const std::vector<std::string>& str_tool_colors);
diff --git a/src/slic3r/GUI/Field.cpp b/src/slic3r/GUI/Field.cpp
index 68d3948bb..bc1a5c1e9 100644
--- a/src/slic3r/GUI/Field.cpp
+++ b/src/slic3r/GUI/Field.cpp
@@ -161,6 +161,13 @@ void Field::get_value_by_opt_type(wxString& str)
 	}
 }
 
+bool TextCtrl::is_defined_input_value()
+{
+    if (static_cast<wxTextCtrl*>(window)->GetValue().empty() && m_opt.type != coString && m_opt.type != coStrings)
+        return false;
+    return true;
+}
+
 void TextCtrl::BUILD() {
     auto size = wxSize(wxDefaultSize);
     if (m_opt.height >= 0) size.SetHeight(m_opt.height);
@@ -226,16 +233,21 @@ void TextCtrl::BUILD() {
 		temp->GetToolTip()->Enable(flag);
 	}), temp->GetId());
 
-#if !defined(__WXGTK__)
 	temp->Bind(wxEVT_KILL_FOCUS, ([this, temp](wxEvent& e)
 	{
-		e.Skip();//	on_kill_focus(e);
+#if !defined(__WXGTK__)
+		e.Skip();
 		temp->GetToolTip()->Enable(true);
-	}), temp->GetId());
 #endif // __WXGTK__
+        if (!is_defined_input_value()) 
+            on_kill_focus(e);
+	}), temp->GetId());
 
     if (m_process_enter) {
-        temp->Bind(wxEVT_TEXT_ENTER, ([this](wxCommandEvent& evt) { on_change_field(); }), temp->GetId());
+        temp->Bind(wxEVT_TEXT_ENTER, ([this](wxCommandEvent& evt) {
+            if(is_defined_input_value()) 
+                on_change_field();
+        }), temp->GetId());
     }
     else {
         temp->Bind(wxEVT_TEXT, ([this](wxCommandEvent& evt)
@@ -243,6 +255,7 @@ void TextCtrl::BUILD() {
 #ifdef __WXGTK__
             if (bChangedValueEvent)
 #endif //__WXGTK__
+            if(is_defined_input_value()) 
                 on_change_field();
         }), temp->GetId());
 
@@ -357,7 +370,7 @@ void SpinCtrl::BUILD() {
 		0, min_val, max_val, default_value);
 
 // 	temp->Bind(wxEVT_SPINCTRL, ([this](wxCommandEvent e) { tmp_value = undef_spin_val; on_change_field(); }), temp->GetId());
-// 	temp->Bind(wxEVT_KILL_FOCUS, ([this](wxEvent& e) { tmp_value = undef_spin_val; on_kill_focus(e); }), temp->GetId());
+	temp->Bind(wxEVT_KILL_FOCUS, ([this](wxEvent& e) { on_kill_focus(e); }), temp->GetId());
 	temp->Bind(wxEVT_TEXT, ([this](wxCommandEvent e)
 	{
 // 		# On OSX / Cocoa, wxSpinCtrl::GetValue() doesn't return the new value
diff --git a/src/slic3r/GUI/Field.hpp b/src/slic3r/GUI/Field.hpp
index 29ae6f9ce..87ec0c1da 100644
--- a/src/slic3r/GUI/Field.hpp
+++ b/src/slic3r/GUI/Field.hpp
@@ -265,7 +265,8 @@ public:
     }
 
 	boost::any&		get_value() override;
-
+    bool            is_defined_input_value();
+    
     virtual void	enable();
     virtual void	disable();
     virtual wxWindow* getWindow() { return window; }
diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 11f3d8e06..e378eb23d 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -3692,6 +3692,34 @@ void GLCanvas3D::delete_selected()
     m_selection.erase();
 }
 
+void GLCanvas3D::ensure_on_bed(unsigned int object_idx)
+{
+    typedef std::map<std::pair<int, int>, double> InstancesToZMap;
+    InstancesToZMap instances_min_z;
+
+    for (GLVolume* volume : m_volumes.volumes)
+    {
+        if ((volume->object_idx() == object_idx) && !volume->is_modifier)
+        {
+            double min_z = volume->transformed_convex_hull_bounding_box().min(2);
+            std::pair<int, int> instance = std::make_pair(volume->object_idx(), volume->instance_idx());
+            InstancesToZMap::iterator it = instances_min_z.find(instance);
+            if (it == instances_min_z.end())
+                it = instances_min_z.insert(InstancesToZMap::value_type(instance, DBL_MAX)).first;
+
+            it->second = std::min(it->second, min_z);
+        }
+    }
+
+    for (GLVolume* volume : m_volumes.volumes)
+    {
+        std::pair<int, int> instance = std::make_pair(volume->object_idx(), volume->instance_idx());
+        InstancesToZMap::iterator it = instances_min_z.find(instance);
+        if (it != instances_min_z.end())
+            volume->set_instance_offset(Z, volume->get_instance_offset(Z) - it->second);
+    }
+}
+
 std::vector<double> GLCanvas3D::get_current_print_zs(bool active_only) const
 {
     return m_volumes.get_current_print_zs(active_only);
@@ -3739,7 +3767,7 @@ void GLCanvas3D::mirror_selection(Axis axis)
 // 3) SLA support meshes for their respective ModelObjects / ModelInstances
 // 4) Wipe tower preview
 // 5) Out of bed collision status & message overlay (texture)
-void GLCanvas3D::reload_scene(bool force)
+void GLCanvas3D::reload_scene(bool refresh_immediately, bool force_full_scene_refresh)
 {
     if ((m_canvas == nullptr) || (m_config == nullptr) || (m_model == nullptr))
         return;
@@ -3781,7 +3809,7 @@ void GLCanvas3D::reload_scene(bool force)
     glvolumes_new.reserve(m_volumes.volumes.size());
     auto model_volume_state_lower = [](const ModelVolumeState &m1, const ModelVolumeState &m2) { return m1.geometry_id < m2.geometry_id; };
 
-    m_reload_delayed = ! m_canvas->IsShown() && ! force;
+    m_reload_delayed = ! m_canvas->IsShown() && ! refresh_immediately && ! force_full_scene_refresh;
 
     PrinterTechnology printer_technology = wxGetApp().preset_bundle->printers.get_edited_preset().printer_technology();
 
@@ -3838,7 +3866,7 @@ void GLCanvas3D::reload_scene(bool force)
                 if (it != model_volume_state.end() && it->geometry_id == key.geometry_id)
 					mvs = &(*it);
             }
-            if (mvs == nullptr) {
+            if (mvs == nullptr || force_full_scene_refresh) {
                 // This GLVolume will be released.
                 volume->release_geometry();
                 if (! m_reload_delayed)
diff --git a/src/slic3r/GUI/GLCanvas3D.hpp b/src/slic3r/GUI/GLCanvas3D.hpp
index d65f55df8..a52b544cf 100644
--- a/src/slic3r/GUI/GLCanvas3D.hpp
+++ b/src/slic3r/GUI/GLCanvas3D.hpp
@@ -814,6 +814,7 @@ public:
     void render();
 
     void delete_selected();
+    void ensure_on_bed(unsigned int object_idx);
 
     std::vector<double> get_current_print_zs(bool active_only) const;
     void set_toolpaths_range(double low, double high);
@@ -823,7 +824,7 @@ public:
 
     void mirror_selection(Axis axis);
 
-    void reload_scene(bool force);
+    void reload_scene(bool refresh_immediately, bool force_full_scene_refresh);
 
     void load_gcode_preview(const GCodePreviewData& preview_data, const std::vector<std::string>& str_tool_colors);
     void load_preview(const std::vector<std::string>& str_tool_colors);
diff --git a/src/slic3r/GUI/GLCanvas3DManager.cpp b/src/slic3r/GUI/GLCanvas3DManager.cpp
index abf783460..fb5b8addb 100644
--- a/src/slic3r/GUI/GLCanvas3DManager.cpp
+++ b/src/slic3r/GUI/GLCanvas3DManager.cpp
@@ -461,6 +461,13 @@ void GLCanvas3DManager::delete_selected(wxGLCanvas* canvas)
         it->second->delete_selected();
 }
 
+void GLCanvas3DManager::ensure_on_bed(wxGLCanvas* canvas, unsigned int object_idx)
+{
+    CanvasesMap::const_iterator it = _get_canvas(canvas);
+    if (it != m_canvases.end())
+        it->second->ensure_on_bed(object_idx);
+}
+
 std::vector<double> GLCanvas3DManager::get_current_print_zs(wxGLCanvas* canvas, bool active_only) const
 {
     CanvasesMap::const_iterator it = _get_canvas(canvas);
@@ -499,11 +506,11 @@ void GLCanvas3DManager::mirror_selection(wxGLCanvas* canvas, Axis axis)
         it->second->mirror_selection(axis);
 }
 
-void GLCanvas3DManager::reload_scene(wxGLCanvas* canvas, bool force)
+void GLCanvas3DManager::reload_scene(wxGLCanvas* canvas, bool refresh_immediately, bool force_full_scene_refresh)
 {
     CanvasesMap::iterator it = _get_canvas(canvas);
     if (it != m_canvases.end())
-        it->second->reload_scene(force);
+        it->second->reload_scene(refresh_immediately, force_full_scene_refresh);
 }
 
 void GLCanvas3DManager::load_gcode_preview(wxGLCanvas* canvas, const GCodePreviewData* preview_data, const std::vector<std::string>& str_tool_colors)
diff --git a/src/slic3r/GUI/GLCanvas3DManager.hpp b/src/slic3r/GUI/GLCanvas3DManager.hpp
index 097d3a118..881befa1b 100644
--- a/src/slic3r/GUI/GLCanvas3DManager.hpp
+++ b/src/slic3r/GUI/GLCanvas3DManager.hpp
@@ -131,6 +131,7 @@ public:
     void render(wxGLCanvas* canvas) const;
 
     void delete_selected(wxGLCanvas* canvas);
+    void ensure_on_bed(wxGLCanvas* canvas, unsigned int object_idx);
 
     std::vector<double> get_current_print_zs(wxGLCanvas* canvas, bool active_only) const;
     void set_toolpaths_range(wxGLCanvas* canvas, double low, double high);
@@ -140,7 +141,7 @@ public:
 
     void mirror_selection(wxGLCanvas* canvas, Axis axis);
 
-    void reload_scene(wxGLCanvas* canvas, bool force);
+    void reload_scene(wxGLCanvas* canvas, bool refresh_immediately, bool force_full_scene_refresh = false);
 
     void load_gcode_preview(wxGLCanvas* canvas, const GCodePreviewData* preview_data, const std::vector<std::string>& str_tool_colors);
     void load_preview(wxGLCanvas* canvas, const std::vector<std::string>& str_tool_colors);
diff --git a/src/slic3r/GUI/GUI_ObjectList.cpp b/src/slic3r/GUI/GUI_ObjectList.cpp
index 94b2d32f2..da358670b 100644
--- a/src/slic3r/GUI/GUI_ObjectList.cpp
+++ b/src/slic3r/GUI/GUI_ObjectList.cpp
@@ -1205,7 +1205,10 @@ void ObjectList::delete_from_model_and_list(const std::vector<ItemForDelete>& it
         else {
             del_subobject_from_object(item->obj_idx, item->sub_obj_idx, item->type);
             if (item->type&itVolume)
+            {
                 m_objects_model->Delete(m_objects_model->GetItemByVolumeId(item->obj_idx, item->sub_obj_idx));
+                _3DScene::ensure_on_bed(wxGetApp().canvas3D(), item->obj_idx);
+            }
             else
                 m_objects_model->Delete(m_objects_model->GetItemByInstanceId(item->obj_idx, item->sub_obj_idx));
         }
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 5f6be2197..99c6148c7 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -930,7 +930,7 @@ struct Plater::priv
 
     priv(Plater *q, MainFrame *main_frame);
 
-    void update(bool force_autocenter = false);
+    void update(bool force_full_scene_refresh = false);
     void select_view(const std::string& direction);
     void update_ui_from_settings();
     ProgressStatusBar* statusbar();
@@ -1144,10 +1144,10 @@ Plater::priv::priv(Plater *q, MainFrame *main_frame)
     q->Layout();
 }
 
-void Plater::priv::update(bool force_autocenter)
+void Plater::priv::update(bool force_full_scene_refresh)
 {
     wxWindowUpdateLocker freeze_guard(q);
-    if (get_config("autocenter") == "1" || force_autocenter) {
+    if (get_config("autocenter") == "1") {
         // auto *bed_shape_opt = config->opt<ConfigOptionPoints>("bed_shape");
         // const auto bed_shape = Slic3r::Polygon::new_scale(bed_shape_opt->values);
         // const BoundingBox bed_shape_bb = bed_shape.bounding_box();
@@ -1160,7 +1160,7 @@ void Plater::priv::update(bool force_autocenter)
         // pulls the correct data.
         this->update_background_process();
     }
-    _3DScene::reload_scene(canvas3D, false);
+    _3DScene::reload_scene(canvas3D, false, force_full_scene_refresh);
     preview->reset_gcode_preview_data();
     preview->reload_print();
 
@@ -1662,9 +1662,9 @@ void Plater::priv::arrange()
     // We enable back the arrange button
     _3DScene::enable_toolbar_item(canvas3D, "arrange", can_arrange());
 
-    // FIXME: none of the following seem to work now. (update did the job previously)
-    // _3DScene::reload_scene(canvas3D, false);
-    update();
+    // Do a full refresh of scene tree, including regenerating all the GLVolumes.
+    //FIXME The update function shall just reload the modified matrices.
+    update(true);
 }
 
 void Plater::priv::split_object()
@@ -2268,7 +2268,7 @@ void Plater::load_files(const std::vector<fs::path>& input_files, bool load_mode
 void Plater::load_files(const std::vector<fs::path> &input_files) { p->load_files(input_files); }
 #endif // ENABLE_NEW_MENU_LAYOUT
 
-void Plater::update(bool force_autocenter) { p->update(force_autocenter); }
+void Plater::update() { p->update(); }
 
 void Plater::select_view(const std::string& direction) { p->select_view(direction); }
 
diff --git a/src/slic3r/GUI/Plater.hpp b/src/slic3r/GUI/Plater.hpp
index d6716c620..ddd5232f8 100644
--- a/src/slic3r/GUI/Plater.hpp
+++ b/src/slic3r/GUI/Plater.hpp
@@ -125,7 +125,7 @@ public:
     void load_files(const std::vector<boost::filesystem::path> &input_files);
 #endif // ENABLE_NEW_MENU_LAYOUT
 
-    void update(bool force_autocenter = false);
+    void update();
     void select_view(const std::string& direction);
 
     void remove(size_t obj_idx);