diff --git a/src/slic3r/GUI/AppConfig.cpp b/src/slic3r/GUI/AppConfig.cpp
index 4b7f5d863..d4970880b 100644
--- a/src/slic3r/GUI/AppConfig.cpp
+++ b/src/slic3r/GUI/AppConfig.cpp
@@ -67,6 +67,12 @@ void AppConfig::set_defaults()
     if (get("remember_output_path").empty())
         set("remember_output_path", "1");
 
+    if (get("use_custom_toolbar_size").empty())
+        set("use_custom_toolbar_size", "0");
+
+    if (get("custom_toolbar_size").empty())
+        set("custom_toolbar_size", "100");
+
     // Remove legacy window positions/sizes
     erase("", "main_frame_maximized");
     erase("", "main_frame_pos");
diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 26d205055..8bdf6de15 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -3418,9 +3418,6 @@ bool GLCanvas3D::_init_toolbar()
         return true;
     }
 
-#if ENABLE_SVG_ICONS
-    m_toolbar.set_icons_size(40);
-#endif // ENABLE_SVG_ICONS
 //    m_toolbar.set_layout_type(GLToolbar::Layout::Vertical);
     m_toolbar.set_layout_type(GLToolbar::Layout::Horizontal);
     m_toolbar.set_layout_orientation(GLToolbar::Layout::Top);
@@ -4097,10 +4094,14 @@ void GLCanvas3D::_render_current_gizmo() const
 void GLCanvas3D::_render_gizmos_overlay() const
 {
 #if ENABLE_RETINA_GL
-    m_gizmos.set_overlay_scale(m_retina_helper->get_scale_factor());
+//     m_gizmos.set_overlay_scale(m_retina_helper->get_scale_factor());
+    const float scale = m_retina_helper->get_scale_factor()*wxGetApp().toolbar_icon_scale();
+    m_gizmos.set_overlay_scale(scale); //! #ys_FIXME_experiment
 #else
 //     m_gizmos.set_overlay_scale(m_canvas->GetContentScaleFactor());
-    m_gizmos.set_overlay_scale(wxGetApp().em_unit()*0.1f);//! #ys_FIXME_experiment
+//     m_gizmos.set_overlay_scale(wxGetApp().em_unit()*0.1f);
+    const float size = int(GLGizmosManager::Default_Icons_Size*wxGetApp().toolbar_icon_scale());
+    m_gizmos.set_overlay_icon_size(size); //! #ys_FIXME_experiment
 #endif /* __WXMSW__ */
 
     m_gizmos.render_overlay(*this, m_selection);
@@ -4110,10 +4111,14 @@ void GLCanvas3D::_render_toolbar() const
 {
 #if ENABLE_SVG_ICONS
 #if ENABLE_RETINA_GL
-    m_toolbar.set_scale(m_retina_helper->get_scale_factor());
+//     m_toolbar.set_scale(m_retina_helper->get_scale_factor());
+    const float scale = m_retina_helper->get_scale_factor() * wxGetApp().toolbar_icon_scale(true);
+    m_toolbar.set_scale(scale); //! #ys_FIXME_experiment
 #else
 //     m_toolbar.set_scale(m_canvas->GetContentScaleFactor());
-    m_toolbar.set_scale(wxGetApp().em_unit()*0.1f);//! #ys_FIXME_experiment
+//     m_toolbar.set_scale(wxGetApp().em_unit()*0.1f);
+    const float size = int(GLToolbar::Default_Icons_Size * wxGetApp().toolbar_icon_scale(true));
+    m_toolbar.set_icons_size(size); //! #ys_FIXME_experiment
 #endif // ENABLE_RETINA_GL
 
     Size cnv_size = get_canvas_size();
@@ -4174,10 +4179,14 @@ void GLCanvas3D::_render_view_toolbar() const
 {
 #if ENABLE_SVG_ICONS
 #if ENABLE_RETINA_GL
-    m_view_toolbar.set_scale(m_retina_helper->get_scale_factor());
+//     m_view_toolbar.set_scale(m_retina_helper->get_scale_factor());
+    const float scale = m_retina_helper->get_scale_factor() * wxGetApp().toolbar_icon_scale();
+    m_view_toolbar.set_scale(scale); //! #ys_FIXME_experiment
 #else
 //     m_view_toolbar.set_scale(m_canvas->GetContentScaleFactor());
-    m_view_toolbar.set_scale(wxGetApp().em_unit()*0.1f); //! #ys_FIXME_experiment
+//     m_view_toolbar.set_scale(wxGetApp().em_unit()*0.1f);
+    const float size = int(GLGizmosManager::Default_Icons_Size * wxGetApp().toolbar_icon_scale());
+    m_view_toolbar.set_icons_size(size); //! #ys_FIXME_experiment
 #endif // ENABLE_RETINA_GL
 
     Size cnv_size = get_canvas_size();
diff --git a/src/slic3r/GUI/GLToolbar.cpp b/src/slic3r/GUI/GLToolbar.cpp
index 842700aef..00cbdfec7 100644
--- a/src/slic3r/GUI/GLToolbar.cpp
+++ b/src/slic3r/GUI/GLToolbar.cpp
@@ -123,7 +123,7 @@ BackgroundTexture::Metadata::Metadata()
 }
 
 #if ENABLE_SVG_ICONS
-const float GLToolbar::Default_Icons_Size = 64.0f;
+const float GLToolbar::Default_Icons_Size = 40.0f;
 #endif // ENABLE_SVG_ICONS
 
 GLToolbar::Layout::Layout()
diff --git a/src/slic3r/GUI/GUI_App.cpp b/src/slic3r/GUI/GUI_App.cpp
index 472abd6dc..6773dbd30 100644
--- a/src/slic3r/GUI/GUI_App.cpp
+++ b/src/slic3r/GUI/GUI_App.cpp
@@ -390,6 +390,27 @@ void GUI_App::set_label_clr_sys(const wxColour& clr) {
     app_config->save();
 }
 
+float GUI_App::toolbar_icon_scale(const bool is_limited/* = false*/) const
+{
+#ifdef __APPLE__
+    const float icon_sc = 1.0f; // for Retina display will be used its own scale
+#else
+    const float icon_sc = m_em_unit*0.1f;
+#endif // __APPLE__
+
+    const std::string& use_val  = app_config->get("use_custom_toolbar_size");
+    const std::string& val      = app_config->get("custom_toolbar_size");
+
+    if (val.empty() || use_val.empty() || use_val == "0")
+        return icon_sc;
+
+    int int_val = atoi(val.c_str());
+    if (is_limited && int_val < 50)
+        int_val = 50;
+
+    return 0.01f * int_val * icon_sc;
+}
+
 void GUI_App::recreate_GUI()
 {
     // Weird things happen as the Paint messages are floating around the windows being destructed.
diff --git a/src/slic3r/GUI/GUI_App.hpp b/src/slic3r/GUI/GUI_App.hpp
index 1c9a462c6..b70f0dc16 100644
--- a/src/slic3r/GUI/GUI_App.hpp
+++ b/src/slic3r/GUI/GUI_App.hpp
@@ -115,6 +115,7 @@ public:
     const wxFont&   normal_font()           { return m_normal_font; }
     size_t          em_unit() const         { return m_em_unit; }
     void            set_em_unit(const size_t em_unit)    { m_em_unit = em_unit; }
+    float           toolbar_icon_scale(const bool is_limited = false) const;
 
     void            recreate_GUI();
     void            system_info();
diff --git a/src/slic3r/GUI/Preferences.cpp b/src/slic3r/GUI/Preferences.cpp
index a29ba5c91..82c3c39e2 100644
--- a/src/slic3r/GUI/Preferences.cpp
+++ b/src/slic3r/GUI/Preferences.cpp
@@ -18,8 +18,13 @@ void PreferencesDialog::build()
 	auto app_config = get_app_config();
 	m_optgroup = std::make_shared<ConfigOptionsGroup>(this, _(L("General")));
     m_optgroup->label_width = 40;
-	m_optgroup->m_on_change = [this](t_config_option_key opt_key, boost::any value){
+	m_optgroup->m_on_change = [this](t_config_option_key opt_key, boost::any value) {
 		m_values[opt_key] = boost::any_cast<bool>(value) ? "1" : "0";
+
+        if (opt_key == "use_custom_toolbar_size") {
+            m_icon_size_sizer->ShowItems(boost::any_cast<bool>(value));
+            this->layout();
+        }
 	};
 
 	// TODO
@@ -109,6 +114,16 @@ void PreferencesDialog::build()
 	m_optgroup->append_single_option_line(option);
 #endif
 
+	def.label = L("Use custom size for toolbar icons");
+	def.type = coBool;
+	def.tooltip = L("If enabled, you can change size of toolbar icons manually.");
+	def.set_default_value(new ConfigOptionBool{ app_config->get("use_custom_toolbar_size") == "1" });
+	option = Option (def,"use_custom_toolbar_size");
+    m_optgroup->append_single_option_line(option);
+
+    create_icon_size_slider();
+    m_icon_size_sizer->ShowItems(app_config->get("use_custom_toolbar_size") == "1");
+
 	auto sizer = new wxBoxSizer(wxVERTICAL);
 	sizer->Add(m_optgroup->sizer, 0, wxEXPAND | wxBOTTOM | wxLEFT | wxRIGHT, 10);
 
@@ -145,17 +160,58 @@ void PreferencesDialog::on_dpi_changed(const wxRect &suggested_rect)
 {
     m_optgroup->msw_rescale();
 
+    msw_buttons_rescale(this, em_unit(), { wxID_OK, wxID_CANCEL });
+
+    layout();
+}
+
+void PreferencesDialog::layout()
+{
     const int em = em_unit();
 
-    msw_buttons_rescale(this, em, { wxID_OK, wxID_CANCEL });
-
-    const wxSize& size = wxSize(47 * em, 28 * em);
-
-    SetMinSize(size);
+    SetMinSize(wxSize(47 * em, 28 * em));
     Fit();
 
     Refresh();
 }
 
+void PreferencesDialog::create_icon_size_slider()
+{
+    const auto app_config = get_app_config();
+
+    const int em = em_unit();
+
+    m_icon_size_sizer = new wxBoxSizer(wxHORIZONTAL);
+
+    auto label = new wxStaticText(this, wxID_ANY, _(L("Icon size in a respect to the default size")) + " (%) :");
+    label->SetFont(wxGetApp().normal_font());
+    label->SetBackgroundStyle(wxBG_STYLE_PAINT);
+
+    m_icon_size_sizer->Add(label, 0, wxALIGN_CENTER_VERTICAL| wxRIGHT | wxLEFT, em);
+
+    const int def_val = atoi(app_config->get("custom_toolbar_size").c_str());
+
+    auto slider = new wxSlider(this, wxID_ANY, def_val, 25, 100, wxDefaultPosition, wxDefaultSize, 
+                               wxSL_LABELS | wxSL_AUTOTICKS);
+
+    slider->SetFont(wxGetApp().normal_font());
+    slider->SetBackgroundStyle(wxBG_STYLE_PAINT);
+
+    slider->SetTickFreq(25);
+    slider->SetPageSize(25);
+
+    slider->SetToolTip(_(L("Select toolbar icon size in respect to the default one.")));
+
+    slider->Bind(wxEVT_SLIDER, ([this, slider](wxCommandEvent e) {
+        auto val = slider->GetValue();
+        m_values["custom_toolbar_size"] = (boost::format("%d") % val).str();
+            return;
+    }), slider->GetId());
+
+    m_icon_size_sizer->Add(slider, 1, wxEXPAND);
+
+    m_optgroup->sizer->Add(m_icon_size_sizer, 0, wxEXPAND | wxALL, em);
+}
+
 } // GUI
 } // Slic3r
\ No newline at end of file
diff --git a/src/slic3r/GUI/Preferences.hpp b/src/slic3r/GUI/Preferences.hpp
index 096a2c906..43a353482 100644
--- a/src/slic3r/GUI/Preferences.hpp
+++ b/src/slic3r/GUI/Preferences.hpp
@@ -16,6 +16,7 @@ class PreferencesDialog : public DPIDialog
 {
 	std::map<std::string, std::string>	m_values;
 	std::shared_ptr<ConfigOptionsGroup>	m_optgroup;
+    wxSizer*                            m_icon_size_sizer;
 public:
 	PreferencesDialog(wxWindow* parent);
 	~PreferencesDialog() {}
@@ -25,6 +26,8 @@ public:
 
 protected:
     void on_dpi_changed(const wxRect &suggested_rect) override;
+    void layout();
+    void create_icon_size_slider();
 };
 
 } // GUI