diff --git a/src/slic3r/GUI/GUI_ObjectList.cpp b/src/slic3r/GUI/GUI_ObjectList.cpp
index 3a7727cfe..4996bbd5d 100644
--- a/src/slic3r/GUI/GUI_ObjectList.cpp
+++ b/src/slic3r/GUI/GUI_ObjectList.cpp
@@ -68,24 +68,26 @@ ObjectList::ObjectList(wxWindow* parent) :
 
 #ifdef __WXMSW__
     // Extruder value changed
-    Bind(wxEVT_CHOICE, [this](wxCommandEvent& event) { update_extruder_in_config(event.GetString()); });
+//     Bind(wxEVT_CHOICE, [this](wxCommandEvent& event) { update_extruder_in_config(event.GetString()); });
 
     GetMainWindow()->Bind(wxEVT_MOTION, [this](wxMouseEvent& event) {
         set_tooltip_for_item(/*event.GetPosition()*/get_mouse_position_in_control());
         event.Skip();
     });
-#else
+// #else
     // equivalent to wxEVT_CHOICE on __WXMSW__
-    Bind(wxEVT_DATAVIEW_ITEM_VALUE_CHANGED, [this](wxDataViewEvent& e) { item_value_change(e); });
+//     Bind(wxEVT_DATAVIEW_ITEM_VALUE_CHANGED, [this](wxDataViewEvent& e) { item_value_change(e); });
 #endif //__WXMSW__
 
-    Bind(wxEVT_DATAVIEW_ITEM_BEGIN_DRAG,    [this](wxDataViewEvent& e) {on_begin_drag(e); });
-    Bind(wxEVT_DATAVIEW_ITEM_DROP_POSSIBLE, [this](wxDataViewEvent& e) {on_drop_possible(e); });
-    Bind(wxEVT_DATAVIEW_ITEM_DROP,          [this](wxDataViewEvent& e) {on_drop(e); });
+    Bind(wxEVT_DATAVIEW_ITEM_BEGIN_DRAG,    [this](wxDataViewEvent& e) { on_begin_drag(e); });
+    Bind(wxEVT_DATAVIEW_ITEM_DROP_POSSIBLE, [this](wxDataViewEvent& e) { on_drop_possible(e); });
+    Bind(wxEVT_DATAVIEW_ITEM_DROP,          [this](wxDataViewEvent& e) { on_drop(e); });
 
-    Bind(wxCUSTOMEVT_LAST_VOLUME_IS_DELETED, [this](wxCommandEvent& e)   {last_volume_is_deleted(e.GetInt()); });
+    Bind(wxCUSTOMEVT_LAST_VOLUME_IS_DELETED, [this](wxCommandEvent& e)   { last_volume_is_deleted(e.GetInt()); });
 
-    Bind(wxEVT_DATAVIEW_ITEM_START_EDITING,     &ObjectList::OnStartEditing,    this);
+//    Bind(wxEVT_DATAVIEW_ITEM_START_EDITING,     &ObjectList::OnStartEditing,    this);
+//     Bind(wxEVT_DATAVIEW_ITEM_EDITING_DONE,      &ObjectList::OnEditingDone,    this);
+    Bind(wxEVT_DATAVIEW_ITEM_VALUE_CHANGED,     &ObjectList::ItemValueChanged, this);
 }
 
 ObjectList::~ObjectList()
@@ -276,9 +278,9 @@ void ObjectList::selection_changed()
 
     part_selection_changed();
 
-#ifdef __WXOSX__
-    update_extruder_in_config(m_selected_extruder);
-#endif //__WXOSX__        
+// #ifdef __WXOSX__
+//     update_extruder_in_config(m_selected_extruder);
+// #endif //__WXOSX__        
 }
 
 void ObjectList::context_menu()
@@ -1623,11 +1625,35 @@ void ObjectList::update_settings_items()
     UnselectAll();
 }
 
-void ObjectList::OnStartEditing(wxDataViewEvent &event)
+// void ObjectList::OnEditingDone(wxDataViewEvent &event)
+// {
+//     m_selected_extruder = event.GetValue().GetString();
+// }
+
+void ObjectList::ItemValueChanged(wxDataViewEvent &event)
 {
-    const auto item_type = m_objects_model->GetItemType(event.GetItem());
-    if ( !(item_type&(itObject|itVolume)) )
-        event.Veto();
+    const wxDataViewItem item = event.GetItem();
+    if (m_objects_model->GetParent(item) == wxDataViewItem(0)) {
+        const int obj_idx = m_objects_model->GetIdByItem(item);
+        m_config = &(*m_objects)[obj_idx]->config;
+    }
+    else {
+        const int obj_idx = m_objects_model->GetIdByItem(m_objects_model->GetParent(item));
+        const int volume_id = m_objects_model->GetVolumeIdByItem(item);
+        m_config = &(*m_objects)[obj_idx]->volumes[volume_id]->config;
+    }
+
+    wxVariant variant;
+    m_objects_model->GetValue(variant, event.GetItem(), 1);
+    const wxString sel_extr = variant.GetString();
+    if (!m_config || sel_extr.empty())
+        return;
+
+    int extruder = sel_extr.size() > 1 ? 0 : atoi(sel_extr.c_str());
+    m_config->set_key_value("extruder", new ConfigOptionInt(extruder));
+
+    // update scene
+    wxGetApp().plater()->update();
 }
 
 } //namespace GUI
diff --git a/src/slic3r/GUI/GUI_ObjectList.hpp b/src/slic3r/GUI/GUI_ObjectList.hpp
index fd707e2eb..2e946a28d 100644
--- a/src/slic3r/GUI/GUI_ObjectList.hpp
+++ b/src/slic3r/GUI/GUI_ObjectList.hpp
@@ -80,9 +80,9 @@ class ObjectList : public wxDataViewCtrl
     bool		m_prevent_list_events = false;		// We use this flag to avoid circular event handling Select() 
                                                     // happens to fire a wxEVT_LIST_ITEM_SELECTED on OSX, whose event handler 
                                                     // calls this method again and again and again
-#ifdef __WXOSX__
-    wxString    m_selected_extruder = "";
-#endif //__WXOSX__
+// #ifdef __WXOSX__
+//     wxString    m_selected_extruder = "";
+// #endif //__WXOSX__
     bool        m_parts_changed = false;
     bool        m_part_settings_changed = false;
 
@@ -202,8 +202,8 @@ public:
     void update_settings_items();
 
 private:
-    void OnStartEditing(wxDataViewEvent &event);
-
+//     void OnEditingDone(wxDataViewEvent &event);
+    void ItemValueChanged(wxDataViewEvent &event);
 };
 
 
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 28a6a5501..5dc685111 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -1453,6 +1453,18 @@ std::vector<size_t> Plater::priv::load_files(const std::vector<fs::path>& input_
                 }
             }
 
+            // check multi-part object adding for the SLA-printing
+            if (printer_technology == ptSLA)
+            {
+                for (auto obj : model.objects)
+                    if ( obj->volumes.size()>1 ) {
+                        Slic3r::GUI::show_error(nullptr, 
+                            wxString::Format(_(L("You can't to add the object(s) from %s because of one or some of them is(are) multi-part")), 
+                                             filename.string()));
+                        return std::vector<size_t>();
+                    }
+            }
+
             if (one_by_one) {
                 auto loaded_idxs = load_model_objects(model.objects);
                 obj_idxs.insert(obj_idxs.end(), loaded_idxs.begin(), loaded_idxs.end());