diff --git a/src/slic3r/GUI/GUI_ObjectList.cpp b/src/slic3r/GUI/GUI_ObjectList.cpp
index fdec4a9c2..d9adcf60b 100644
--- a/src/slic3r/GUI/GUI_ObjectList.cpp
+++ b/src/slic3r/GUI/GUI_ObjectList.cpp
@@ -191,7 +191,7 @@ ObjectList::ObjectList(wxWindow* parent) :
 //    Bind(wxEVT_KEY_DOWN, &ObjectList::OnChar, this);
     {
         // Accelerators
-        wxAcceleratorEntry entries[8];
+        wxAcceleratorEntry entries[10];
         entries[0].Set(wxACCEL_CTRL, (int) 'C',    wxID_COPY);
         entries[1].Set(wxACCEL_CTRL, (int) 'X',    wxID_CUT);
         entries[2].Set(wxACCEL_CTRL, (int) 'V',    wxID_PASTE);
@@ -200,7 +200,9 @@ ObjectList::ObjectList(wxWindow* parent) :
         entries[5].Set(wxACCEL_CTRL, (int) 'Y',    wxID_REDO);
         entries[6].Set(wxACCEL_NORMAL, WXK_DELETE, wxID_DELETE);
         entries[7].Set(wxACCEL_NORMAL, WXK_BACK,   wxID_DELETE);
-        wxAcceleratorTable accel(8, entries);
+        entries[8].Set(wxACCEL_NORMAL, int('+'),   wxID_ADD);
+        entries[9].Set(wxACCEL_NORMAL, int('-'),   wxID_REMOVE);
+        wxAcceleratorTable accel(10, entries);
         SetAcceleratorTable(accel);
 
         this->Bind(wxEVT_MENU, [this](wxCommandEvent &evt) { this->copy();                      }, wxID_COPY);
@@ -209,6 +211,8 @@ ObjectList::ObjectList(wxWindow* parent) :
         this->Bind(wxEVT_MENU, [this](wxCommandEvent &evt) { this->remove();                    }, wxID_DELETE);
         this->Bind(wxEVT_MENU, [this](wxCommandEvent &evt) { this->undo();  					}, wxID_UNDO);
         this->Bind(wxEVT_MENU, [this](wxCommandEvent &evt) { this->redo();                    	}, wxID_REDO);
+        this->Bind(wxEVT_MENU, [this](wxCommandEvent &evt) { this->increase_instance();         }, wxID_ADD);
+        this->Bind(wxEVT_MENU, [this](wxCommandEvent &evt) { this->decrease_instance();         }, wxID_REMOVE);
     }
 #else //__WXOSX__
     Bind(wxEVT_CHAR, [this](wxKeyEvent& event) { key_event(event); }); // doesn't work on OSX
@@ -1092,6 +1096,16 @@ void ObjectList::redo()
 	wxGetApp().plater()->redo();	
 }
 
+void ObjectList::increase_instances()
+{
+    wxGetApp().plater()->increase_instances(1);
+}
+
+void ObjectList::decrease_instances()
+{
+    wxGetApp().plater()->decrease_instances(1);
+}
+
 #ifndef __WXOSX__
 void ObjectList::key_event(wxKeyEvent& event)
 {
@@ -1116,6 +1130,10 @@ void ObjectList::key_event(wxKeyEvent& event)
         redo();
     else if (wxGetKeyState(wxKeyCode('Z')) && wxGetKeyState(WXK_CONTROL))
         undo();
+    else if (event.GetUnicodeKey() == '+')
+        increase_instances();
+    else if (event.GetUnicodeKey() == '-')
+        decrease_instances();
     else
         event.Skip();
 }
diff --git a/src/slic3r/GUI/GUI_ObjectList.hpp b/src/slic3r/GUI/GUI_ObjectList.hpp
index c8bdd2d2c..011da676d 100644
--- a/src/slic3r/GUI/GUI_ObjectList.hpp
+++ b/src/slic3r/GUI/GUI_ObjectList.hpp
@@ -257,6 +257,8 @@ public:
     bool                paste_from_clipboard();
     void                undo();
     void                redo();
+    void                increase_instances();
+    void                decrease_instances();
 
     void                get_settings_choice(const wxString& category_name);
     void                get_freq_settings_choice(const wxString& bundle_name);