diff --git a/src/libslic3r/Print.cpp b/src/libslic3r/Print.cpp
index 5dbe8574b3..315965a65d 100644
--- a/src/libslic3r/Print.cpp
+++ b/src/libslic3r/Print.cpp
@@ -1114,6 +1114,13 @@ StringObjectException Print::validate(StringObjectException *warning, Polygons*
             if (layer_height > min_nozzle_diameter)
                 return  {L("Layer height cannot exceed nozzle diameter"), object, "layer_height"};
 
+            for (auto range : object->m_model_object->layer_config_ranges) {
+                double range_layer_height = range.second.opt_float("layer_height");
+                if (range_layer_height > object->m_slicing_params.max_layer_height ||
+                    range_layer_height < object->m_slicing_params.min_layer_height)
+                    return  { L("Layer height cannot exceed nozzle diameter"), nullptr, "layer_height" };
+            }
+
             // Validate extrusion widths.
             std::string err_msg;
             if (!validate_extrusion_width(object->config(), "line_width", layer_height, err_msg))
diff --git a/src/libslic3r/PrintApply.cpp b/src/libslic3r/PrintApply.cpp
index 79a9143eac..45e0dd932c 100644
--- a/src/libslic3r/PrintApply.cpp
+++ b/src/libslic3r/PrintApply.cpp
@@ -168,6 +168,8 @@ static bool layer_height_ranges_equal(const t_layer_config_ranges &lr1, const t_
     auto it2 = lr2.begin();
     for (const auto &kvp1 : lr1) {
         const auto &kvp2 = *it2 ++;
+        if (!kvp2.second.has("layer_height") || !kvp1.second.has("layer_height"))
+            return false;
         if (std::abs(kvp1.first.first  - kvp2.first.first ) > EPSILON ||
             std::abs(kvp1.first.second - kvp2.first.second) > EPSILON ||
             (check_layer_height && std::abs(kvp1.second.option("layer_height")->getFloat() - kvp2.second.option("layer_height")->getFloat()) > EPSILON))
diff --git a/src/libslic3r/PrintConfig.hpp b/src/libslic3r/PrintConfig.hpp
index e83c91a6ef..22808f1b42 100644
--- a/src/libslic3r/PrintConfig.hpp
+++ b/src/libslic3r/PrintConfig.hpp
@@ -702,58 +702,58 @@ PRINT_CONFIG_CLASS_DEFINE(
 PRINT_CONFIG_CLASS_DEFINE(
     PrintRegionConfig,
 
-    ((ConfigOptionInt,                  bottom_shell_layers))
-    ((ConfigOptionFloat,                bottom_shell_thickness))
-    ((ConfigOptionFloat,                bridge_angle))
-    ((ConfigOptionFloat,                bridge_flow))
-    ((ConfigOptionFloat,                bridge_speed))
-    ((ConfigOptionBool,                 ensure_vertical_shell_thickness))
-    ((ConfigOptionEnum<InfillPattern>,  top_surface_pattern))
-    ((ConfigOptionEnum<InfillPattern>,  bottom_surface_pattern))
-    ((ConfigOptionFloat,                outer_wall_line_width))
-    ((ConfigOptionFloat,                outer_wall_speed))
-    ((ConfigOptionFloat,                infill_direction))
-    ((ConfigOptionPercent,              sparse_infill_density))
-    ((ConfigOptionEnum<InfillPattern>,  sparse_infill_pattern))
-    ((ConfigOptionEnum<FuzzySkinType>,  fuzzy_skin))
-    ((ConfigOptionFloat,                fuzzy_skin_thickness))
-    ((ConfigOptionFloat,                fuzzy_skin_point_distance))
-    ((ConfigOptionFloat,                gap_infill_speed))
-    ((ConfigOptionInt,                  sparse_infill_filament))
-    ((ConfigOptionFloat,                sparse_infill_line_width))
-    ((ConfigOptionPercent,              infill_wall_overlap))
-    ((ConfigOptionFloat,                sparse_infill_speed))
+    ((ConfigOptionInt, bottom_shell_layers))
+    ((ConfigOptionFloat, bottom_shell_thickness))
+    ((ConfigOptionFloat, bridge_angle))
+    ((ConfigOptionFloat, bridge_flow))
+    ((ConfigOptionFloat, bridge_speed))
+    ((ConfigOptionBool, ensure_vertical_shell_thickness))
+    ((ConfigOptionEnum<InfillPattern>, top_surface_pattern))
+    ((ConfigOptionEnum<InfillPattern>, bottom_surface_pattern))
+    ((ConfigOptionFloat, outer_wall_line_width))
+    ((ConfigOptionFloat, outer_wall_speed))
+    ((ConfigOptionFloat, infill_direction))
+    ((ConfigOptionPercent, sparse_infill_density))
+    ((ConfigOptionEnum<InfillPattern>, sparse_infill_pattern))
+    ((ConfigOptionEnum<FuzzySkinType>, fuzzy_skin))
+    ((ConfigOptionFloat, fuzzy_skin_thickness))
+    ((ConfigOptionFloat, fuzzy_skin_point_distance))
+    ((ConfigOptionFloat, gap_infill_speed))
+    ((ConfigOptionInt, sparse_infill_filament))
+    ((ConfigOptionFloat, sparse_infill_line_width))
+    ((ConfigOptionPercent, infill_wall_overlap))
+    ((ConfigOptionFloat, sparse_infill_speed))
     //BBS
-    ((ConfigOptionBool,                 infill_combination))
+    ((ConfigOptionBool, infill_combination))
     // Ironing options
-    ((ConfigOptionEnum<IroningType>,    ironing_type))
-    ((ConfigOptionPercent,              ironing_flow))
-    ((ConfigOptionFloat,                ironing_spacing))
-    ((ConfigOptionFloat,                ironing_speed))
+    ((ConfigOptionEnum<IroningType>, ironing_type))
+    ((ConfigOptionPercent, ironing_flow))
+    ((ConfigOptionFloat, ironing_spacing))
+    ((ConfigOptionFloat, ironing_speed))
     // Detect bridging perimeters
-    ((ConfigOptionBool,                 detect_overhang_wall))
-    ((ConfigOptionInt,                  wall_filament))
-    ((ConfigOptionFloat,                inner_wall_line_width))
-    ((ConfigOptionFloat,                inner_wall_speed))
+    ((ConfigOptionBool, detect_overhang_wall))
+    ((ConfigOptionInt, wall_filament))
+    ((ConfigOptionFloat, inner_wall_line_width))
+    ((ConfigOptionFloat, inner_wall_speed))
     // Total number of perimeters.
-    ((ConfigOptionInt,                  wall_loops))
-    ((ConfigOptionFloat,                minimum_sparse_infill_area))
-    ((ConfigOptionInt,                  solid_infill_filament))
-    ((ConfigOptionFloat,                internal_solid_infill_line_width))
-    ((ConfigOptionFloat,                internal_solid_infill_speed))
+    ((ConfigOptionInt, wall_loops))
+    ((ConfigOptionFloat, minimum_sparse_infill_area))
+    ((ConfigOptionInt, solid_infill_filament))
+    ((ConfigOptionFloat, internal_solid_infill_line_width))
+    ((ConfigOptionFloat, internal_solid_infill_speed))
     // Detect thin walls.
-    ((ConfigOptionBool,                 detect_thin_wall))
-    ((ConfigOptionFloat,                top_surface_line_width))
-    ((ConfigOptionInt,                  top_shell_layers))
-    ((ConfigOptionFloat,                top_shell_thickness))
-    ((ConfigOptionFloat,                top_surface_speed))
+    ((ConfigOptionBool, detect_thin_wall))
+    ((ConfigOptionFloat, top_surface_line_width))
+    ((ConfigOptionInt, top_shell_layers))
+    ((ConfigOptionFloat, top_shell_thickness))
+    ((ConfigOptionFloat, top_surface_speed))
     //BBS
-    ((ConfigOptionBool,                 enable_overhang_speed))
-    ((ConfigOptionFloat,                overhang_1_4_speed))
-    ((ConfigOptionFloat,                overhang_2_4_speed))
-    ((ConfigOptionFloat,                overhang_3_4_speed))
-    ((ConfigOptionFloat,                overhang_4_4_speed))
-    ((ConfigOptionBool,                 only_one_wall_top))
+    ((ConfigOptionBool, enable_overhang_speed))
+    ((ConfigOptionFloat, overhang_1_4_speed))
+    ((ConfigOptionFloat, overhang_2_4_speed))
+    ((ConfigOptionFloat, overhang_3_4_speed))
+    ((ConfigOptionFloat, overhang_4_4_speed))
+    ((ConfigOptionBool, only_one_wall_top))
 )
 
 PRINT_CONFIG_CLASS_DEFINE(
diff --git a/src/slic3r/CMakeLists.txt b/src/slic3r/CMakeLists.txt
index f33eb3df15..46d1a87da3 100644
--- a/src/slic3r/CMakeLists.txt
+++ b/src/slic3r/CMakeLists.txt
@@ -195,6 +195,8 @@ set(SLIC3R_GUI_SOURCES
     GUI/GUI_Factories.hpp
     GUI/GUI_ObjectList.cpp
     GUI/GUI_ObjectList.hpp
+    GUI/GUI_ObjectLayers.cpp
+    GUI/GUI_ObjectLayers.hpp
     GUI/GUI_AuxiliaryList.cpp
     GUI/GUI_AuxiliaryList.hpp
     GUI/GUI_ObjectSettings.cpp
diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 71014054b2..c31ca9bc69 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -4760,6 +4760,7 @@ void GLCanvas3D::handle_sidebar_focus_event(const std::string& opt_key, bool foc
 void GLCanvas3D::handle_layers_data_focus_event(const t_layer_height_range range, const EditorType type)
 {
     std::string field = "layer_" + std::to_string(type) + "_" + std::to_string(range.first) + "_" + std::to_string(range.second);
+    m_gizmos.reset_all_states();
     handle_sidebar_focus_event(field, true);
 }
 
@@ -8063,8 +8064,7 @@ void GLCanvas3D::_render_sla_slices()
 
 void GLCanvas3D::_render_selection_sidebar_hints() const
 {
-    //BBS do not render sidebar hints
-    //m_selection.render_sidebar_hints(m_sidebar_field, m_gizmos.get_uniform_scaling());
+    m_selection.render_sidebar_hints(m_sidebar_field, m_gizmos.get_uniform_scaling());
 }
 
 void GLCanvas3D::_update_volumes_hover_state()
diff --git a/src/slic3r/GUI/GUI_App.cpp b/src/slic3r/GUI/GUI_App.cpp
index 316e07038a..bbeca86a3d 100644
--- a/src/slic3r/GUI/GUI_App.cpp
+++ b/src/slic3r/GUI/GUI_App.cpp
@@ -4908,6 +4908,11 @@ Tab* GUI_App::get_model_tab(bool part)
     return model_tabs_list[part ? 1 : 0];
 }
 
+Tab* GUI_App::get_layer_tab()
+{
+    return model_tabs_list[2];
+}
+
 ConfigOptionMode GUI_App::get_mode()
 {
     if (!app_config->has("user_mode"))
@@ -5604,6 +5609,11 @@ ObjectList* GUI_App::obj_list()
     return sidebar().obj_list();
 }
 
+ObjectLayers* GUI_App::obj_layers()
+{
+    return sidebar().obj_layers();
+}
+
 Plater* GUI_App::plater()
 {
     return plater_;
diff --git a/src/slic3r/GUI/GUI_App.hpp b/src/slic3r/GUI/GUI_App.hpp
index 51b85bd0b0..62803cb003 100644
--- a/src/slic3r/GUI/GUI_App.hpp
+++ b/src/slic3r/GUI/GUI_App.hpp
@@ -66,6 +66,7 @@ class MainFrame;
 class Sidebar;
 class ObjectSettings;
 class ObjectList;
+class ObjectLayers;
 class Plater;
 class ParamsPanel;
 class NotificationManager;
@@ -455,6 +456,7 @@ public:
 
     Tab*            get_tab(Preset::Type type);
     Tab*            get_model_tab(bool part = false);
+    Tab*            get_layer_tab();
     ConfigOptionMode get_mode();
     void            save_mode(const /*ConfigOptionMode*/int mode) ;
     void            update_mode();
@@ -502,6 +504,7 @@ public:
     Sidebar&             sidebar();
     ObjectSettings*      obj_settings();
     ObjectList*          obj_list();
+    ObjectLayers*        obj_layers();
     Plater*              plater();
     const Plater*        plater() const;
     ParamsPanel*         params_panel();
diff --git a/src/slic3r/GUI/GUI_Factories.cpp b/src/slic3r/GUI/GUI_Factories.cpp
index 288fd9ada3..a54a84c270 100644
--- a/src/slic3r/GUI/GUI_Factories.cpp
+++ b/src/slic3r/GUI/GUI_Factories.cpp
@@ -18,6 +18,7 @@
 
 #include <boost/algorithm/string.hpp>
 #include "slic3r/Utils/FixModelByWin10.hpp"
+#include "ParamsPanel.hpp"
 
 namespace Slic3r
 {
@@ -200,7 +201,7 @@ std::map<std::string, std::vector<SimpleSettingData>> SettingsFactory::get_all_v
 }
 
 
-SettingsFactory::Bundle SettingsFactory::get_bundle(const DynamicPrintConfig* config, bool is_object_settings)
+SettingsFactory::Bundle SettingsFactory::get_bundle(const DynamicPrintConfig* config, bool is_object_settings, bool is_layer_settings/* = false*/)
 {
     auto opt_keys = config->keys();
     if (opt_keys.empty())
@@ -208,6 +209,8 @@ SettingsFactory::Bundle SettingsFactory::get_bundle(const DynamicPrintConfig* co
 
     // update options list according to print technology
     auto full_current_opts = get_options(!is_object_settings);
+    if (is_layer_settings)
+        full_current_opts.push_back("layer_height");
     for (int i = opt_keys.size() - 1; i >= 0; --i)
         if (find(full_current_opts.begin(), full_current_opts.end(), opt_keys[i]) == full_current_opts.end())
             opt_keys.erase(opt_keys.begin() + i);
@@ -506,6 +509,15 @@ void MenuFactory::append_menu_items_add_volume(wxMenu* menu)
         append_submenu(menu, sub_menu, wxID_ANY, _(item.first), "", item.second,
             []() { return obj_list()->is_instance_or_object_selected(); }, m_parent);
     }
+
+    append_menu_item_layers_editing(menu);
+}
+
+wxMenuItem* MenuFactory::append_menu_item_layers_editing(wxMenu* menu)
+{
+    return append_menu_item(menu, wxID_ANY, _L("Height range Modifier"), "",
+        [](wxCommandEvent&) { obj_list()->layers_editing(); wxGetApp().params_panel()->switch_to_object(); }, "", menu,
+        []() { return obj_list()->is_instance_or_object_selected(); }, m_parent);
 }
 
 wxMenuItem* MenuFactory::append_menu_item_settings(wxMenu* menu_)
@@ -549,7 +561,7 @@ wxMenuItem* MenuFactory::append_menu_item_settings(wxMenu* menu_)
 
     if (printer_technology() == ptFFF ||
         (menu->GetMenuItems().size() > 0 && !menu->GetMenuItems().back()->IsSeparator()))
-        menu->SetFirstSeparator();
+        ;// menu->SetFirstSeparator();
 
     // detect itemm for adding of the setting
     ObjectList* object_list = obj_list();
@@ -573,7 +585,7 @@ wxMenuItem* MenuFactory::append_menu_item_settings(wxMenu* menu_)
     // BBS remvoe freq setting popupmenu
     // create_freq_settings_popupmenu(menu, is_object_settings, item);
 
-    menu->SetSecondSeparator();
+    //menu->SetSecondSeparator();
 
     // Add full settings list
     auto  menu_item = new wxMenuItem(menu, wxID_ANY, menu_name);
diff --git a/src/slic3r/GUI/GUI_Factories.hpp b/src/slic3r/GUI/GUI_Factories.hpp
index 8e2814b572..3d99a072bd 100644
--- a/src/slic3r/GUI/GUI_Factories.hpp
+++ b/src/slic3r/GUI/GUI_Factories.hpp
@@ -37,7 +37,7 @@ struct SettingsFactory
     static std::map<std::string, std::vector<SimpleSettingData>>  PART_CATEGORY_SETTINGS;
 
     static wxBitmap                             get_category_bitmap(const std::string& category_name, bool menu_bmp = true);
-    static Bundle                               get_bundle(const DynamicPrintConfig* config, bool is_object_settings);
+    static Bundle                               get_bundle(const DynamicPrintConfig* config, bool is_object_settings, bool is_layer_settings = false);
     static std::vector<std::string>             get_options(bool is_part);
     //BBS: add api to get options for catogary
     static std::vector<SimpleSettingData> get_visible_options(const std::string& category, const bool is_part);
@@ -115,6 +115,7 @@ private:
 
     wxMenu*     append_submenu_add_generic(wxMenu* menu, ModelVolumeType type);
     void        append_menu_items_add_volume(wxMenu* menu);
+    wxMenuItem* append_menu_item_layers_editing(wxMenu* menu);
     wxMenuItem* append_menu_item_settings(wxMenu* menu);
     wxMenuItem* append_menu_item_change_type(wxMenu* menu);
     wxMenuItem* append_menu_item_instance_to_object(wxMenu* menu);
diff --git a/src/slic3r/GUI/GUI_ObjectLayers.cpp b/src/slic3r/GUI/GUI_ObjectLayers.cpp
index a1e4f09c2c..4dc2a2e77b 100644
--- a/src/slic3r/GUI/GUI_ObjectLayers.cpp
+++ b/src/slic3r/GUI/GUI_ObjectLayers.cpp
@@ -22,24 +22,15 @@ namespace GUI
 ObjectLayers::ObjectLayers(wxWindow* parent) :
     OG_Settings(parent, true)
 {
-    m_grid_sizer = new wxFlexGridSizer(3, 5, wxGetApp().em_unit()); // "Min Z", "Max Z", "Layer height" & buttons sizer
+    m_grid_sizer = new wxFlexGridSizer(3, 0, wxGetApp().em_unit()); // "Min Z", "Max Z", "Layer height" & buttons sizer
     m_grid_sizer->SetFlexibleDirection(wxHORIZONTAL);
 
-    // Legend for object layers
-    for (const std::string col : { L("From height"), L("To height"), L("Layer height") }) {
-        auto temp = new wxStaticText(m_parent, wxID_ANY, _(col), wxDefaultPosition, wxDefaultSize, wxST_ELLIPSIZE_MIDDLE);
-        temp->SetBackgroundStyle(wxBG_STYLE_PAINT);
-        temp->SetFont(wxGetApp().bold_font());
-
-        m_grid_sizer->Add(temp);
-    }
-
     m_og->activate();
     m_og->sizer->Clear(true);
-    m_og->sizer->Add(m_grid_sizer, 0, wxEXPAND | wxALL, wxOSX ? 0 : 5);
+    m_og->sizer->Add(m_grid_sizer, 0, wxEXPAND | wxLEFT | wxRIGHT, wxOSX ? 0 : 5);
 
-    m_bmp_delete    = ScalableBitmap(parent, "remove_copies"/*"cross"*/);
-    m_bmp_add       = ScalableBitmap(parent, "add_copies");
+    m_bmp_delete    = ScalableBitmap(parent, "delete_filament"/*"cross"*/);
+    m_bmp_add       = ScalableBitmap(parent, "add_filament");
 }
 
 void ObjectLayers::select_editor(LayerRangeEditor* editor, const bool is_last_edited_range)
@@ -80,6 +71,12 @@ wxSizer* ObjectLayers::create_layer(const t_layer_height_range& range, PlusMinus
             m_selection_type = type;
     };
 
+    // Add text
+    auto head_text = new wxStaticText(m_parent, wxID_ANY, _L("Height Range"), wxDefaultPosition, wxDefaultSize, wxST_ELLIPSIZE_END);
+    head_text->SetBackgroundStyle(wxBG_STYLE_PAINT);
+    head_text->SetFont(wxGetApp().normal_font());
+    m_grid_sizer->Add(head_text, 0, wxLEFT | wxALIGN_CENTER_VERTICAL, wxGetApp().em_unit());
+
     // Add control for the "Min Z"
 
     auto editor = new LayerRangeEditor(this, double_to_string(range.first), etMinZ, set_focus_data, 
@@ -103,7 +100,15 @@ wxSizer* ObjectLayers::create_layer(const t_layer_height_range& range, PlusMinus
     });
 
     select_editor(editor, is_last_edited_range);
-    m_grid_sizer->Add(editor);
+
+    auto sizer1 = new wxBoxSizer(wxHORIZONTAL);
+    sizer1->Add(editor);
+    auto middle_text = new wxStaticText(m_parent, wxID_ANY, _L("to"), wxDefaultPosition, wxDefaultSize, wxST_ELLIPSIZE_END);
+    middle_text->SetBackgroundStyle(wxBG_STYLE_PAINT);
+    middle_text->SetFont(wxGetApp().normal_font());
+    sizer1->Add(middle_text, 0, wxLEFT | wxALIGN_CENTER_VERTICAL, wxGetApp().em_unit());
+
+    m_grid_sizer->Add(sizer1);
 
     // Add control for the "Max Z"
 
@@ -127,29 +132,38 @@ wxSizer* ObjectLayers::create_layer(const t_layer_height_range& range, PlusMinus
     });
 
     select_editor(editor, is_last_edited_range);
-    m_grid_sizer->Add(editor);
 
+    auto sizer2 = new wxBoxSizer(wxHORIZONTAL);
+    sizer2->Add(editor);
+    auto unit_text = new wxStaticText(m_parent, wxID_ANY, _L("mm"), wxDefaultPosition, wxDefaultSize, wxST_ELLIPSIZE_END);
+    unit_text->SetBackgroundStyle(wxBG_STYLE_PAINT);
+    unit_text->SetFont(wxGetApp().normal_font());
+    sizer2->Add(unit_text, 0, wxLEFT | wxALIGN_CENTER_VERTICAL, wxGetApp().em_unit());
+
+    m_grid_sizer->Add(sizer2);
+
+    // BBS
     // Add control for the "Layer height"
 
-    editor = new LayerRangeEditor(this, double_to_string(m_object->layer_config_ranges[range].option("layer_height")->getFloat()), etLayerHeight, set_focus_data,
-        [range](coordf_t layer_height, bool, bool)
-    {
-        return wxGetApp().obj_list()->edit_layer_range(range, layer_height);
-    });
+    //editor = new LayerRangeEditor(this, double_to_string(m_object->layer_config_ranges[range].option("layer_height")->getFloat()), etLayerHeight, set_focus_data,
+    //    [range](coordf_t layer_height, bool, bool)
+    //{
+    //    return wxGetApp().obj_list()->edit_layer_range(range, layer_height);
+    //});
 
-    select_editor(editor, is_last_edited_range);
+    //select_editor(editor, is_last_edited_range);
 
-    auto sizer = new wxBoxSizer(wxHORIZONTAL);
-    sizer->Add(editor);
+    //auto sizer = new wxBoxSizer(wxHORIZONTAL);
+    //sizer->Add(editor);
 
-    auto temp = new wxStaticText(m_parent, wxID_ANY, _L("mm"));
-    temp->SetBackgroundStyle(wxBG_STYLE_PAINT);
-    temp->SetFont(wxGetApp().normal_font());
-    sizer->Add(temp, 0, wxLEFT | wxALIGN_CENTER_VERTICAL, wxGetApp().em_unit());
+    //auto temp = new wxStaticText(m_parent, wxID_ANY, _L("mm"));
+    //temp->SetBackgroundStyle(wxBG_STYLE_PAINT);
+    //temp->SetFont(wxGetApp().normal_font());
+    //sizer->Add(temp, 0, wxLEFT | wxALIGN_CENTER_VERTICAL, wxGetApp().em_unit());
 
-    m_grid_sizer->Add(sizer);
+    //m_grid_sizer->Add(sizer);
 
-    return sizer;
+    return sizer2;
 }
     
 void ObjectLayers::create_layers_list()
@@ -157,9 +171,11 @@ void ObjectLayers::create_layers_list()
     for (const auto &layer : m_object->layer_config_ranges) {
         const t_layer_height_range& range = layer.first;
         auto del_btn = new PlusMinusButton(m_parent, m_bmp_delete, range);
+        del_btn->SetBackgroundColour(m_parent->GetBackgroundColour());
         del_btn->SetToolTip(_L("Remove height range"));
 
         auto add_btn = new PlusMinusButton(m_parent, m_bmp_add, range);
+        add_btn->SetBackgroundColour(m_parent->GetBackgroundColour());
         wxString tooltip = wxGetApp().obj_list()->can_add_new_range_after_current(range);
         add_btn->SetToolTip(tooltip.IsEmpty() ? _L("Add height range") : tooltip);
         add_btn->Enable(tooltip.IsEmpty());
@@ -195,18 +211,8 @@ void ObjectLayers::update_layers_list()
     m_object = objects_ctrl->object(obj_idx);
     if (!m_object || m_object->layer_config_ranges.empty()) return;
 
-    // Delete all controls from options group except of the legends
-
-    const int cols = m_grid_sizer->GetEffectiveColsCount();
-    const int rows = m_grid_sizer->GetEffectiveRowsCount();
-    for (int idx = cols*rows-1; idx >= cols; idx--) {
-        wxSizerItem* t = m_grid_sizer->GetItem(idx);
-        if (t->IsSizer())
-            t->GetSizer()->Clear(true);
-        else
-            t->DeleteWindows();
-        m_grid_sizer->Remove(idx);
-    }
+    // Delete all controls from options group
+    m_grid_sizer->Clear(true);
 
     // Add new control according to the selected item  
 
diff --git a/src/slic3r/GUI/GUI_ObjectList.cpp b/src/slic3r/GUI/GUI_ObjectList.cpp
index 76d968cdfc..d15a60afed 100644
--- a/src/slic3r/GUI/GUI_ObjectList.cpp
+++ b/src/slic3r/GUI/GUI_ObjectList.cpp
@@ -946,15 +946,13 @@ void ObjectList::selection_changed()
         const ItemType type = m_objects_model->GetItemType(item);
         // to correct visual hints for layers editing on the Scene
         if (type & (itLayer|itLayerRoot)) {
-            //BBS remove obj_layers
-            // wxGetApp().obj_layers()->reset_selection();
+            wxGetApp().obj_layers()->reset_selection();
 
             if (type & itLayerRoot)
                 wxGetApp().plater()->canvas3D()->handle_sidebar_focus_event("", false);
             else {
-                //BBS remove obj_layers
-                //wxGetApp().obj_layers()->set_selectable_range(m_objects_model->GetLayerRangeByItem(item));
-                //wxGetApp().obj_layers()->update_scene_from_editor_selection();
+                wxGetApp().obj_layers()->set_selectable_range(m_objects_model->GetLayerRangeByItem(item));
+                wxGetApp().obj_layers()->update_scene_from_editor_selection();
             }
         }
     }
@@ -1221,7 +1219,10 @@ void ObjectList::list_manipulation(const wxPoint& mouse_pos, bool evt_context_me
 
             get_selected_item_indexes(obj_idx, vol_idx, item);
             //wxGetApp().plater()->PopupObjectTable(obj_idx, vol_idx, mouse_pos);
-            dynamic_cast<TabPrintModel*>(wxGetApp().get_model_tab(vol_idx >= 0))->reset_model_config();
+            if (m_objects_model->GetItemType(item) & itLayer)
+                dynamic_cast<TabPrintLayer*>(wxGetApp().get_layer_tab())->reset_model_config();
+            else
+                dynamic_cast<TabPrintModel*>(wxGetApp().get_model_tab(vol_idx >= 0))->reset_model_config();
         }
         else if (col_num == colName)
         {
@@ -2865,8 +2866,7 @@ void ObjectList::layers_editing()
         return;
 
     // to correct visual hints for layers editing on the Scene, reset previous selection
-    //BBS remove obj_layers
-    //wxGetApp().obj_layers()->reset_selection();
+    wxGetApp().obj_layers()->reset_selection();
     wxGetApp().plater()->canvas3D()->handle_sidebar_focus_event("", false);
 
     // select LayerRoor item and expand
@@ -3268,7 +3268,14 @@ void ObjectList::part_selection_changed()
                     m_config = &(*m_objects)[obj_idx]->config;
                     disable_ss_manipulation = (*m_objects)[obj_idx]->is_cut();
                 }
-                // BBS: remove height range logics
+                else if (type & (itLayerRoot | itLayer)) {
+                    og_name = type & itLayerRoot ? _L("Height ranges") : _L("Settings for height range");
+                    update_and_show_layers = true;
+                    update_and_show_settings = true;
+
+                    if (type & itLayer)
+                        m_config = &get_item_config(item);
+                }
             }
         }
     }
@@ -3300,8 +3307,7 @@ void ObjectList::part_selection_changed()
     if (printer_technology() == ptSLA)
         update_and_show_layers = false;
     else if (update_and_show_layers) {
-        //BBS remove obj layers
-        //wxGetApp().obj_layers()->get_og()->set_name(" ");
+        ;//wxGetApp().obj_layers()->get_og()->set_name(" " + og_name + " ");
     }
 
     update_min_height();
@@ -3313,8 +3319,7 @@ void ObjectList::part_selection_changed()
     // BBS
     //wxGetApp().obj_manipul() ->UpdateAndShow(update_and_show_manipulations);
     wxGetApp().obj_settings()->UpdateAndShow(update_and_show_settings);
-    //BBS
-    //wxGetApp().obj_layers()  ->UpdateAndShow(update_and_show_layers);
+    wxGetApp().obj_layers()  ->UpdateAndShow(update_and_show_layers);
     wxGetApp().plater()->show_object_info();
 
     panel.Layout();
@@ -3330,13 +3335,33 @@ wxDataViewItem ObjectList::add_settings_item(wxDataViewItem parent_item, const D
         return ret;
 
     const bool is_object_settings = m_objects_model->GetItemType(parent_item) == itObject;
+    const bool is_volume_settings = m_objects_model->GetItemType(parent_item) == itVolume;
+    const bool is_layer_settings = m_objects_model->GetItemType(parent_item) == itLayer;
     if (!is_object_settings) {
         ModelVolumeType volume_type = m_objects_model->GetVolumeType(parent_item);
         if (volume_type == ModelVolumeType::NEGATIVE_VOLUME || volume_type == ModelVolumeType::SUPPORT_BLOCKER || volume_type == ModelVolumeType::SUPPORT_ENFORCER)
             return ret;
     }
 
-    SettingsFactory::Bundle cat_options = SettingsFactory::get_bundle(config, is_object_settings);
+    SettingsFactory::Bundle cat_options = SettingsFactory::get_bundle(config, is_object_settings, is_layer_settings);
+    if (is_layer_settings) {
+        auto tab_object = dynamic_cast<TabPrintModel*>(wxGetApp().get_model_tab());
+        auto object_cfg = tab_object->get_config();
+        if (config->opt_float("layer_height") == object_cfg->opt_float("layer_height")) {
+            SettingsFactory::Bundle new_cat_options;
+            for (auto cat_opt : cat_options) {
+                std::vector<string> temp;
+                for (auto value : cat_opt.second) {
+                    if (value != "layer_height")
+                        temp.push_back(value);
+                }
+                if (!temp.empty())
+                    new_cat_options[cat_opt.first] = temp;
+            }
+            cat_options = new_cat_options;
+        }
+    }
+
     if (cat_options.empty()) {
 #if NEW_OBJECT_SETTING
         ObjectDataViewModelNode *node = static_cast<ObjectDataViewModelNode*>(parent_item.GetID());
diff --git a/src/slic3r/GUI/GUI_ObjectSettings.cpp b/src/slic3r/GUI/GUI_ObjectSettings.cpp
index d6662b8b4d..f11085543e 100644
--- a/src/slic3r/GUI/GUI_ObjectSettings.cpp
+++ b/src/slic3r/GUI/GUI_ObjectSettings.cpp
@@ -26,7 +26,9 @@ namespace GUI
 OG_Settings::OG_Settings(wxWindow* parent, const bool staticbox) :
     m_parent(parent)
 {
-    wxString title = staticbox ? " " : ""; // temporary workaround - #ys_FIXME
+    //BBS
+    wxString title = "";
+    //wxString title = staticbox ? " " : ""; // temporary workaround - #ys_FIXME
     m_og = std::make_shared<ConfigOptionsGroup>(parent, title);
 }
 
@@ -106,13 +108,14 @@ bool ObjectSettings::update_settings_list()
 			auto opt_key = (line.get_options())[0].opt_id;  //we assume that we have one option per line
 
 			auto btn = new ScalableButton(parent, wxID_ANY, m_bmp_delete);
+            btn->SetBackgroundColour(parent->GetBackgroundColour());
             btn->SetToolTip(_(L("Remove parameter")));
 
             btn->SetBitmapFocus(m_bmp_delete_focus.bmp());
             btn->SetBitmapHover(m_bmp_delete_focus.bmp());
 
 			btn->Bind(wxEVT_BUTTON, [opt_key, config, this](wxEvent &event) {
-                wxGetApp().plater()->take_snapshot(from_u8(boost::format(("Delete Option %s") % opt_key).str()));
+                wxGetApp().plater()->take_snapshot(from_u8((boost::format("Delete Option %s") % opt_key).str()).ToStdString());
 				config->erase(opt_key);
                 wxGetApp().obj_list()->changed_object();
                 wxTheApp->CallAfter([this]() {
@@ -159,7 +162,7 @@ bool ObjectSettings::update_settings_list()
             for (auto& opt : cat.second)
                 optgroup->get_field(opt)->m_on_change = [optgroup](const std::string& opt_id, const boost::any& value) {
                     // first of all take a snapshot and then change value in configuration
-                    wxGetApp().plater()->take_snapshot(from_u8((boost::format("Change Option %s")% opt_id).str()));
+                    wxGetApp().plater()->take_snapshot(from_u8((boost::format("Change Option %s")% opt_id).str()).ToStdString());
                     optgroup->on_change_OG(opt_id, value);
                 };
 
@@ -183,7 +186,6 @@ bool ObjectSettings::update_settings_list()
 }
 
 #else
-
 bool ObjectSettings::update_settings_list()
 {
     if (!wxGetApp().is_editor())
@@ -198,51 +200,74 @@ bool ObjectSettings::update_settings_list()
     objects_ctrl->GetSelections(items);
 
     std::map<ObjectBase *, ModelConfig *> object_configs;
-    bool is_object_settings = true;
-    bool is_volume_settings = true;
+    bool is_object_settings = false;
+    bool is_volume_settings = false;
+    bool is_layer_range_settings = false;
+    bool is_layer_root = false;
     ModelObject * parent_object = nullptr;
     for (auto item : items) {
         auto type = objects_model->GetItemType(item);
-        if (type != itObject && type != itVolume) {
+        if (type != itObject && type != itVolume && type != itLayerRoot && type != itLayer) {
             continue;
         }
         const int obj_idx = objects_model->GetObjectIdByItem(item);
         assert(obj_idx >= 0);
         auto object = wxGetApp().model().objects[obj_idx];
         if (type == itObject) {
-            if (!is_object_settings)
-                return false;
-            is_volume_settings = false;
+            is_object_settings = true;
             object_configs.emplace(object, &object->config);
-        } else {
-            if (!is_volume_settings)
-                return false;
+        } 
+        else if(type == itVolume){
+            is_volume_settings = true;
             if (parent_object && parent_object != object)
                 return false;
             parent_object = object;
-            is_object_settings = false;
             const int vol_idx = objects_model->GetVolumeIdByItem(item);
             assert(vol_idx >= 0);
             auto volume = object->volumes[vol_idx];
             object_configs.emplace(volume, &volume->config);
         }
+        else if(type == itLayer){
+            is_layer_range_settings = true;
+            if (parent_object && parent_object != object)
+                return false;
+            parent_object = object;
+
+            t_layer_height_range height_range = objects_model->GetLayerRangeByItem(item);
+            object_configs.emplace( (ObjectBase*)(&object->layer_config_ranges.at(height_range)), &object->layer_config_ranges.at(height_range) );
+        }
+        else if (type == itLayerRoot) {
+            is_layer_root = true;
+        }
     }
 
     auto tab_object = dynamic_cast<TabPrintModel*>(wxGetApp().get_model_tab());
     auto tab_volume = dynamic_cast<TabPrintModel*>(wxGetApp().get_model_tab(true));
+    auto tab_layer = dynamic_cast<TabPrintModel*>(wxGetApp().get_layer_tab());
 
-    if (is_volume_settings == is_object_settings) {
-        tab_object->set_model_config({});
-        tab_volume->set_model_config({});
-        m_tab_active = nullptr;
-    } else if (is_volume_settings) {
-        tab_object->set_model_config({{parent_object, &parent_object->config}});
-        tab_volume->set_model_config(object_configs);
-        m_tab_active = tab_volume;
-    } else if (is_object_settings) {
+    if (is_object_settings) {
         tab_object->set_model_config(object_configs);
         tab_volume->set_model_config({});
+        tab_layer->set_model_config({});
         m_tab_active = tab_object;
+    }   
+    else if (is_volume_settings) {
+        tab_object->set_model_config({ {parent_object, &parent_object->config} });
+        tab_volume->set_model_config(object_configs);
+        tab_layer->set_model_config({});
+        m_tab_active = tab_volume;
+    }
+    else if (is_layer_range_settings) {
+        tab_object->set_model_config({ {parent_object, &parent_object->config} });
+        tab_volume->set_model_config({});
+        tab_layer->set_model_config(object_configs);
+        m_tab_active = tab_layer;
+    }    
+    else {
+        tab_object->set_model_config({});
+        tab_volume->set_model_config({});
+        tab_layer->set_model_config({});
+        m_tab_active = nullptr;
     }
     ((ParamsPanel*) tab_object->GetParent())->set_active_tab(nullptr);
     return true;
diff --git a/src/slic3r/GUI/MainFrame.cpp b/src/slic3r/GUI/MainFrame.cpp
index 8b0cbc3c42..cd3a3b6f36 100644
--- a/src/slic3r/GUI/MainFrame.cpp
+++ b/src/slic3r/GUI/MainFrame.cpp
@@ -1093,6 +1093,7 @@ void MainFrame::create_preset_tabs()
     add_created_tab(new TabPrint(m_param_panel), "cog");
     add_created_tab(new TabPrintObject(m_param_panel), "cog");
     add_created_tab(new TabPrintPart(m_param_panel), "cog");
+    add_created_tab(new TabPrintLayer(m_param_panel), "cog");
     add_created_tab(new TabFilament(m_param_dialog->panel()), "spool");
     /* BBS work around to avoid appearance bug */
     //add_created_tab(new TabSLAPrint(m_param_panel));
diff --git a/src/slic3r/GUI/ObjectDataViewModel.cpp b/src/slic3r/GUI/ObjectDataViewModel.cpp
index 936de904c3..aead8232d8 100644
--- a/src/slic3r/GUI/ObjectDataViewModel.cpp
+++ b/src/slic3r/GUI/ObjectDataViewModel.cpp
@@ -1207,7 +1207,7 @@ void ObjectDataViewModel::DeleteSettings(const wxDataViewItem& parent)
     node->set_action_icon(false);
     ItemChanged(parent);
 #else
-     if volume has a "settings"item, than delete it before volume deleting
+    // if volume has a "settings"item, than delete it before volume deleting
     if (node->GetChildCount() > 0 && node->GetNthChild(0)->GetType() == itSettings) {
         auto settings_node = node->GetNthChild(0);
         auto settings_item = wxDataViewItem(settings_node);
@@ -2208,8 +2208,10 @@ void ObjectDataViewModel::Rescale()
             break;
         case itLayerRoot:
             node->m_bmp = create_scaled_bitmap(LayerRootIcon);
+            break;
         case itLayer:
             node->m_bmp = create_scaled_bitmap(LayerIcon);
+            break;
         case itInfo:
             node->m_bmp = m_info_bmps.at(node->m_info_item_type);
             break;
diff --git a/src/slic3r/GUI/ParamsPanel.cpp b/src/slic3r/GUI/ParamsPanel.cpp
index 6148823ff7..b4c72137ad 100644
--- a/src/slic3r/GUI/ParamsPanel.cpp
+++ b/src/slic3r/GUI/ParamsPanel.cpp
@@ -404,6 +404,10 @@ void ParamsPanel::create_layout()
         m_left_sizer->Add( m_tab_print_part, 0, wxEXPAND );
     }
 
+    if (m_tab_print_layer) {
+        m_left_sizer->Add(m_tab_print_layer, 0, wxEXPAND);
+    }
+
     if (m_tab_filament) {
         if (m_staticline_filament)
             m_left_sizer->Add(m_staticline_filament, 0, wxEXPAND);
@@ -488,6 +492,7 @@ void ParamsPanel::refresh_tabs()
     if (m_top_panel) {
         m_tab_print_object = wxGetApp().get_model_tab();
         m_tab_print_part = wxGetApp().get_model_tab(true);
+        m_tab_print_layer = wxGetApp().get_layer_tab();
     }
     return;
 }
@@ -557,6 +562,8 @@ void ParamsPanel::set_active_tab(wxPanel* tab)
             cur_tab = (Tab*) m_tab_print;
         } else if (m_tab_print_part && ((TabPrintModel*) m_tab_print_part)->has_model_config()) {
             cur_tab = (Tab*) m_tab_print_part;
+        } else if (m_tab_print_layer && ((TabPrintModel*)m_tab_print_layer)->has_model_config()) {
+            cur_tab = (Tab*)m_tab_print_layer;
         } else if (m_tab_print_object && ((TabPrintModel*) m_tab_print_object)->has_model_config()) {
             cur_tab = (Tab*) m_tab_print_object;
         }
@@ -578,6 +585,7 @@ void ParamsPanel::set_active_tab(wxPanel* tab)
             {m_tab_print, m_staticline_print},
             {m_tab_print_object, m_staticline_print_object},
             {m_tab_print_part, m_staticline_print_part},
+            {m_tab_print_layer, nullptr},
             {m_tab_filament, m_staticline_filament},
             {m_tab_printer, m_staticline_printer}})) {
         if (!t.first) continue;
@@ -641,7 +649,7 @@ void ParamsPanel::msw_rescale()
         ((SwitchButton* )m_mode_region)->Rescale();
     if (m_mode_view)
         ((SwitchButton* )m_mode_view)->Rescale();
-    for (auto tab : {m_tab_print, m_tab_print_object, m_tab_print_part, m_tab_filament, m_tab_printer}) {
+    for (auto tab : {m_tab_print, m_tab_print_object, m_tab_print_part, m_tab_print_layer, m_tab_filament, m_tab_printer}) {
         if (tab) dynamic_cast<Tab*>(tab)->msw_rescale();
     }
     //((Button*)m_export_to_file)->Rescale();
diff --git a/src/slic3r/GUI/ParamsPanel.hpp b/src/slic3r/GUI/ParamsPanel.hpp
index c39f7cfbc9..7e752aa335 100644
--- a/src/slic3r/GUI/ParamsPanel.hpp
+++ b/src/slic3r/GUI/ParamsPanel.hpp
@@ -93,6 +93,7 @@ class ParamsPanel : public wxPanel
         wxPanel* m_tab_print_object { nullptr };
         wxStaticLine* m_staticline_print_object { nullptr };
         wxPanel* m_tab_print_part { nullptr };
+        wxPanel* m_tab_print_layer { nullptr };
         wxStaticLine* m_staticline_print_part { nullptr };
         wxStaticLine* m_staticline_filament { nullptr };
         //wxBoxSizer* m_filament_sizer { nullptr };
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 8d60fa64ad..0035201787 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -325,6 +325,7 @@ struct Sidebar::priv
 
     ObjectList          *m_object_list{ nullptr };
     ObjectSettings      *object_settings{ nullptr };
+    ObjectLayers        *object_layers{ nullptr };
 
     wxButton *btn_export_gcode;
     wxButton *btn_reslice;
@@ -924,6 +925,10 @@ Sidebar::Sidebar(Plater *parent)
 #endif
     }
 
+    p->object_layers = new ObjectLayers(p->scrolled);
+    p->object_layers->Hide();
+    p->sizer_params->Add(p->object_layers->get_sizer(), 0, wxEXPAND | wxTOP, 0);
+
     auto *sizer = new wxBoxSizer(wxVERTICAL);
     sizer->Add(p->scrolled, 1, wxEXPAND);
     SetSizer(sizer);
@@ -1458,6 +1463,11 @@ ObjectSettings* Sidebar::obj_settings()
     return p->object_settings;
 }
 
+ObjectLayers* Sidebar::obj_layers()
+{
+    return p->object_layers;
+}
+
 wxPanel* Sidebar::scrolled_panel()
 {
     return p->scrolled;
diff --git a/src/slic3r/GUI/Plater.hpp b/src/slic3r/GUI/Plater.hpp
index 130b20f174..d735a550f6 100644
--- a/src/slic3r/GUI/Plater.hpp
+++ b/src/slic3r/GUI/Plater.hpp
@@ -63,6 +63,7 @@ namespace GUI {
 class MainFrame;
 class ConfigOptionsGroup;
 class ObjectSettings;
+class ObjectLayers;
 class ObjectList;
 class GLCanvas3D;
 class Mouse3DController;
@@ -128,6 +129,7 @@ public:
 
     ObjectList*             obj_list();
     ObjectSettings*         obj_settings();
+    ObjectLayers*           obj_layers();
     wxPanel*                scrolled_panel();
     wxPanel* print_panel();
     wxPanel* filament_panel();
diff --git a/src/slic3r/GUI/Selection.cpp b/src/slic3r/GUI/Selection.cpp
index dea947993a..d91db4725d 100644
--- a/src/slic3r/GUI/Selection.cpp
+++ b/src/slic3r/GUI/Selection.cpp
@@ -2350,7 +2350,7 @@ void Selection::render_sidebar_layers_hints(const std::string& sidebar_field) co
 
     ::glBegin(GL_QUADS);
     if ((camera_on_top && type == 1) || (!camera_on_top && type == 2))
-        ::glColor4f(1.0f, 0.38f, 0.0f, 1.0f);
+        ::glColor4f(0.0f, 174.0f / 255.0f, 66.0f / 255.0f, 1.0f);
     else
         ::glColor4f(0.8f, 0.8f, 0.8f, 0.5f);
     ::glVertex3f(min_x, min_y, z1);
@@ -2361,7 +2361,7 @@ void Selection::render_sidebar_layers_hints(const std::string& sidebar_field) co
 
     ::glBegin(GL_QUADS);
     if ((camera_on_top && type == 2) || (!camera_on_top && type == 1))
-        ::glColor4f(1.0f, 0.38f, 0.0f, 1.0f);
+        ::glColor4f(0.0f, 174.0f / 255.0f, 66.0f / 255.0f, 1.0f);
     else
         ::glColor4f(0.8f, 0.8f, 0.8f, 0.5f);
     ::glVertex3f(min_x, min_y, z2);
diff --git a/src/slic3r/GUI/Tab.cpp b/src/slic3r/GUI/Tab.cpp
index ea5a7d8232..c4f2e87c99 100644
--- a/src/slic3r/GUI/Tab.cpp
+++ b/src/slic3r/GUI/Tab.cpp
@@ -2283,8 +2283,9 @@ void TabPrintModel::reset_model_config()
     wxGetApp().plater()->take_snapshot(std::string("Reset Options"));
     for (auto config : m_object_configs) {
         auto rmkeys = intersect(m_keys, config.second->keys());
-        for (auto & k : rmkeys)
+        for (auto& k : rmkeys) {
             config.second->erase(k);
+        }
         notify_changed(config.first);
     }
     update_model_config();
@@ -2405,6 +2406,44 @@ void TabPrintPart::notify_changed(ObjectBase * object)
     wxGetApp().obj_list()->object_config_options_changed({vol->get_object(), vol});
 }
 
+static std::string layer_height = "layer_height";
+TabPrintLayer::TabPrintLayer(ParamsPanel* parent) :
+    TabPrintModel(parent, concat({ layer_height }, PrintRegionConfig().keys()))
+{
+    m_parent_tab = wxGetApp().get_model_tab();
+}
+
+void TabPrintLayer::notify_changed(ObjectBase * object)
+{
+    for (auto config : m_object_configs) {
+        if (!config.second->has(layer_height)) {
+            auto option = m_parent_tab->get_config()->option(layer_height);
+            config.second->set_key_value(layer_height, option->clone());
+        }
+        auto objects_list = wxGetApp().obj_list();
+        wxDataViewItemArray items;
+        objects_list->GetSelections(items);
+        for (auto item : items)
+            objects_list->add_settings_item(item, &config.second->get());
+    }
+}
+
+void TabPrintLayer::update_custom_dirty()
+{
+    for (auto k : m_null_keys) m_options_list[k] = 0;
+    for (auto k : m_all_keys) m_options_list[k] &= ~osSystemValue;
+
+    auto option = m_parent_tab->get_config()->option(layer_height);
+    for (auto config : m_object_configs) {
+        if (!config.second->has(layer_height)) {
+            config.second->set_key_value(layer_height, option->clone());
+            m_options_list[layer_height] = osInitValue | osSystemValue;
+        }
+        else if (config.second->opt_float(layer_height) == option->getFloat())
+            m_options_list[layer_height] = osInitValue | osSystemValue;
+    }
+}
+
 bool Tab::validate_custom_gcode(const wxString& title, const std::string& gcode)
 {
     std::vector<std::string> tags;
diff --git a/src/slic3r/GUI/Tab.hpp b/src/slic3r/GUI/Tab.hpp
index b495d3f9b6..4a2224b6a9 100644
--- a/src/slic3r/GUI/Tab.hpp
+++ b/src/slic3r/GUI/Tab.hpp
@@ -461,7 +461,7 @@ public:
 
 	void update_model_config();
 
-	void reset_model_config();
+	virtual void reset_model_config();
 
 	bool has_key(std::string const &key);
 
@@ -506,6 +506,17 @@ protected:
 	virtual void    notify_changed(ObjectBase * object) override;
 };
 
+class TabPrintLayer : public TabPrintModel
+{
+public:
+	//BBS: GUI refactor
+	TabPrintLayer(ParamsPanel* parent);
+	~TabPrintLayer() {}
+protected:
+	virtual void    notify_changed(ObjectBase* object) override;
+	virtual void    update_custom_dirty() override;
+};
+
 class TabFilament : public Tab
 {
 private: