diff --git a/lib/Slic3r/GUI/Plater.pm b/lib/Slic3r/GUI/Plater.pm
index ed1ebcc6d..d1ccf07d5 100644
--- a/lib/Slic3r/GUI/Plater.pm
+++ b/lib/Slic3r/GUI/Plater.pm
@@ -105,6 +105,34 @@ sub new {
         $self->{btn_print}->Enable($enable);
         $self->{btn_send_gcode}->Enable($enable);
     };
+
+    # callback to react to gizmo scale
+    my $on_gizmo_scale_uniformly = sub {
+        my ($scale) = @_;
+
+        my ($obj_idx, $object) = $self->selected_object;
+        return if !defined $obj_idx;
+
+        my $model_object = $self->{model}->objects->[$obj_idx];
+        my $model_instance = $model_object->instances->[0];
+        
+        my $variation = $scale / $model_instance->scaling_factor;
+        #FIXME Scale the layer height profile?
+        foreach my $range (@{ $model_object->layer_height_ranges }) {
+            $range->[0] *= $variation;
+            $range->[1] *= $variation;
+        }
+        $_->set_scaling_factor($scale) for @{ $model_object->instances };
+        $object->transform_thumbnail($self->{model}, $obj_idx);
+    
+        #update print and start background processing
+        $self->stop_background_process;
+        $self->{print}->add_model_object($model_object, $obj_idx);
+    
+        $self->selection_changed(1);  # refresh info (size, volume etc.)
+        $self->update;
+        $self->schedule_background_process;
+    };
     
     # Initialize 3D plater
     if ($Slic3r::GUI::have_OpenGL) {
@@ -122,6 +150,7 @@ sub new {
         Slic3r::GUI::_3DScene::register_on_remove_object_callback($self->{canvas3D}, sub { $self->remove() });
         Slic3r::GUI::_3DScene::register_on_instance_moved_callback($self->{canvas3D}, $on_instances_moved);
         Slic3r::GUI::_3DScene::register_on_enable_action_buttons_callback($self->{canvas3D}, $enable_action_buttons);
+        Slic3r::GUI::_3DScene::register_on_gizmo_scale_uniformly_callback($self->{canvas3D}, $on_gizmo_scale_uniformly);
         Slic3r::GUI::_3DScene::enable_gizmos($self->{canvas3D}, 1);
         Slic3r::GUI::_3DScene::enable_shader($self->{canvas3D}, 1);
         Slic3r::GUI::_3DScene::enable_force_zoom_to_bed($self->{canvas3D}, 1);
diff --git a/xs/src/libslic3r/Utils.hpp b/xs/src/libslic3r/Utils.hpp
index 05eaf282f..921841a27 100644
--- a/xs/src/libslic3r/Utils.hpp
+++ b/xs/src/libslic3r/Utils.hpp
@@ -95,6 +95,7 @@ public:
     void call(int i) const;
     void call(int i, int j) const;
     void call(const std::vector<int>& ints) const;
+    void call(double d) const;
     void call(double x, double y) const;
     void call(bool b) const;
 private:
diff --git a/xs/src/libslic3r/utils.cpp b/xs/src/libslic3r/utils.cpp
index 83c45b190..745d07fcd 100644
--- a/xs/src/libslic3r/utils.cpp
+++ b/xs/src/libslic3r/utils.cpp
@@ -247,6 +247,21 @@ void PerlCallback::call(const std::vector<int>& ints) const
     LEAVE;
 }
 
+void PerlCallback::call(double d) const
+{
+    if (!m_callback)
+        return;
+    dSP;
+    ENTER;
+    SAVETMPS;
+    PUSHMARK(SP);
+    XPUSHs(sv_2mortal(newSVnv(d)));
+    PUTBACK;
+    perl_call_sv(SvRV((SV*)m_callback), G_DISCARD);
+    FREETMPS;
+    LEAVE;
+}
+
 void PerlCallback::call(double x, double y) const
 {
     if (!m_callback)
diff --git a/xs/src/slic3r/GUI/3DScene.cpp b/xs/src/slic3r/GUI/3DScene.cpp
index 34d066730..1879b3082 100644
--- a/xs/src/slic3r/GUI/3DScene.cpp
+++ b/xs/src/slic3r/GUI/3DScene.cpp
@@ -2038,6 +2038,11 @@ void _3DScene::register_on_enable_action_buttons_callback(wxGLCanvas* canvas, vo
     s_canvas_mgr.register_on_enable_action_buttons_callback(canvas, callback);
 }
 
+void _3DScene::register_on_gizmo_scale_uniformly_callback(wxGLCanvas* canvas, void* callback)
+{
+    s_canvas_mgr.register_on_gizmo_scale_uniformly_callback(canvas, callback);
+}
+
 static inline int hex_digit_to_int(const char c)
 {
     return 
diff --git a/xs/src/slic3r/GUI/3DScene.hpp b/xs/src/slic3r/GUI/3DScene.hpp
index 26b9911e0..c6a166397 100644
--- a/xs/src/slic3r/GUI/3DScene.hpp
+++ b/xs/src/slic3r/GUI/3DScene.hpp
@@ -312,9 +312,9 @@ public:
     // Boolean: Is mouse over this object?
     bool                hover;
     // Wheter or not this volume has been generated from a modifier
-    bool                 is_modifier;
+    bool                is_modifier;
     // Wheter or not this volume has been generated from the wipe tower
-    bool                 is_wipe_tower;
+    bool                is_wipe_tower;
 
     // Interleaved triangles & normals with indexed triangles & quads.
     GLIndexedVertexArray        indexed_vertex_array;
@@ -589,6 +589,7 @@ public:
     static void register_on_instance_moved_callback(wxGLCanvas* canvas, void* callback);
     static void register_on_wipe_tower_moved_callback(wxGLCanvas* canvas, void* callback);
     static void register_on_enable_action_buttons_callback(wxGLCanvas* canvas, void* callback);
+    static void register_on_gizmo_scale_uniformly_callback(wxGLCanvas* canvas, void* callback);
 
     static std::vector<int> load_object(wxGLCanvas* canvas, const ModelObject* model_object, int obj_idx, std::vector<int> instance_idxs);
     static std::vector<int> load_object(wxGLCanvas* canvas, const Model* model, int obj_idx);
diff --git a/xs/src/slic3r/GUI/GLCanvas3D.cpp b/xs/src/slic3r/GUI/GLCanvas3D.cpp
index ae5125d6c..f9c10017e 100644
--- a/xs/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/xs/src/slic3r/GUI/GLCanvas3D.cpp
@@ -1263,6 +1263,25 @@ void GLCanvas3D::Gizmos::update(const Pointf& mouse_pos)
         curr->update(mouse_pos);
 }
 
+void GLCanvas3D::Gizmos::update_data(float scale)
+{
+    if (!m_enabled)
+        return;
+
+    GizmosMap::const_iterator it = m_gizmos.find(Scale);
+    if (it != m_gizmos.end())
+        reinterpret_cast<GLGizmoScale*>(it->second)->set_scale(scale);
+}
+
+bool GLCanvas3D::Gizmos::is_running() const
+{
+    if (!m_enabled)
+        return false;
+
+    GLGizmoBase* curr = _get_current();
+    return (curr != nullptr) ? (curr->get_state() == GLGizmoBase::On) : false;
+}
+
 bool GLCanvas3D::Gizmos::is_dragging() const
 {
     return m_dragging;
@@ -1281,6 +1300,15 @@ void GLCanvas3D::Gizmos::stop_dragging()
     m_dragging = false;
 }
 
+float GLCanvas3D::Gizmos::get_scale() const
+{
+    if (!m_enabled)
+        return 1.0f;
+
+    GizmosMap::const_iterator it = m_gizmos.find(Scale);
+    return (it != m_gizmos.end()) ? reinterpret_cast<GLGizmoScale*>(it->second)->get_scale() : 1.0f;
+}
+
 void GLCanvas3D::Gizmos::render(const GLCanvas3D& canvas, const BoundingBoxf3& box) const
 {
     if (!m_enabled)
@@ -2443,6 +2471,12 @@ void GLCanvas3D::register_on_enable_action_buttons_callback(void* callback)
         m_on_enable_action_buttons_callback.register_callback(callback);
 }
 
+void GLCanvas3D::register_on_gizmo_scale_uniformly_callback(void* callback)
+{
+    if (callback != nullptr)
+        m_on_gizmo_scale_uniformly_callback.register_callback(callback);
+}
+
 void GLCanvas3D::bind_event_handlers()
 {
     if (m_canvas != nullptr)
@@ -2661,11 +2695,14 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
         else if ((selected_object_idx != -1) && gizmos_overlay_contains_mouse)
         {
             m_gizmos.update_on_off_state(*this, m_mouse.position);
+            _update_gizmos_data();
             m_dirty = true;
         }
         else if ((selected_object_idx != -1) && m_gizmos.grabber_contains_mouse())
-        {
+        {            
+            _update_gizmos_data();
             m_gizmos.start_dragging();
+            m_dirty = true;
         }
         else
         {
@@ -2688,6 +2725,10 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
                                 vol->selected = true;
                         }
                     }
+
+                    if (m_gizmos.is_running())
+                        _update_gizmos_data();
+
                     m_dirty = true;
                 }
             }
@@ -2779,6 +2820,8 @@ void GLCanvas3D::on_mouse(wxMouseEvent& evt)
 
         const Pointf3& cur_pos = _mouse_to_bed_3d(pos);
         m_gizmos.update(Pointf(cur_pos.x, cur_pos.y));
+
+        m_on_gizmo_scale_uniformly_callback.call((double)m_gizmos.get_scale());
         m_dirty = true;
     }
     else if (evt.Dragging() && !gizmos_overlay_contains_mouse)
@@ -3120,6 +3163,7 @@ void GLCanvas3D::_deregister_callbacks()
     m_on_instance_moved_callback.deregister_callback();
     m_on_wipe_tower_moved_callback.deregister_callback();
     m_on_enable_action_buttons_callback.deregister_callback();
+    m_on_gizmo_scale_uniformly_callback.deregister_callback();
 }
 
 void GLCanvas3D::_mark_volumes_for_layer_height() const
@@ -3549,28 +3593,9 @@ Pointf3 GLCanvas3D::_mouse_to_3d(const Point& mouse_pos, float* z)
 
 Pointf3 GLCanvas3D::_mouse_to_bed_3d(const Point& mouse_pos)
 {
-    if (!set_current())
-        return Pointf3(DBL_MAX, DBL_MAX, DBL_MAX);
-
-    GLint viewport[4];
-    ::glGetIntegerv(GL_VIEWPORT, viewport);
-
-    _camera_tranform();
-
-    GLdouble modelview_matrix[16];
-    ::glGetDoublev(GL_MODELVIEW_MATRIX, modelview_matrix);
-    GLdouble projection_matrix[16];
-    ::glGetDoublev(GL_PROJECTION_MATRIX, projection_matrix);
-
-    GLint y = viewport[3] - (GLint)mouse_pos.y;
-
-    GLdouble x0, y0, z0;
-    ::gluUnProject((GLdouble)mouse_pos.x, (GLdouble)y, 0.1, modelview_matrix, projection_matrix, viewport, &x0, &y0, &z0);
-
-    GLdouble x1, y1, z1;
-    ::gluUnProject((GLdouble)mouse_pos.x, (GLdouble)y, 0.9, modelview_matrix, projection_matrix, viewport, &x1, &y1, &z1);
-
-    return Linef3(Pointf3(x0, y0, z0), Pointf3(x1, y1, z1)).intersect_plane(0.0);
+    float z0 = 0.0f;
+    float z1 = 1.0f;
+    return Linef3(_mouse_to_3d(mouse_pos, &z0), _mouse_to_3d(mouse_pos, &z1)).intersect_plane(0.0);
 }
 
 void GLCanvas3D::_start_timer()
@@ -4239,6 +4264,21 @@ void GLCanvas3D::_on_select(int volume_idx)
     m_on_select_object_callback.call(id);
 }
 
+void GLCanvas3D::_update_gizmos_data()
+{
+    int id = _get_first_selected_object_id();
+    if ((id != -1) && (m_model != nullptr))
+    {
+        ModelObject* model_object = m_model->objects[id];
+        if (model_object != nullptr)
+        {
+            ModelInstance* model_instance = model_object->instances[0];
+            if (model_instance != nullptr)
+                m_gizmos.update_data(model_instance->scaling_factor);
+        }
+    }
+}
+
 std::vector<float> GLCanvas3D::_parse_colors(const std::vector<std::string>& colors)
 {
     static const float INV_255 = 1.0f / 255.0f;
diff --git a/xs/src/slic3r/GUI/GLCanvas3D.hpp b/xs/src/slic3r/GUI/GLCanvas3D.hpp
index 32dc1d934..c503d1845 100644
--- a/xs/src/slic3r/GUI/GLCanvas3D.hpp
+++ b/xs/src/slic3r/GUI/GLCanvas3D.hpp
@@ -360,11 +360,15 @@ public:
         bool overlay_contains_mouse(const GLCanvas3D& canvas, const Pointf& mouse_pos) const;
         bool grabber_contains_mouse() const;
         void update(const Pointf& mouse_pos);
+        void update_data(float scale);
 
+        bool is_running() const;
         bool is_dragging() const;
         void start_dragging();
         void stop_dragging();
 
+        float get_scale() const;
+
         void render(const GLCanvas3D& canvas, const BoundingBoxf3& box) const;
         void render_current_gizmo_for_picking_pass(const BoundingBoxf3& box) const;
 
@@ -437,6 +441,7 @@ private:
     PerlCallback m_on_instance_moved_callback;
     PerlCallback m_on_wipe_tower_moved_callback;
     PerlCallback m_on_enable_action_buttons_callback;
+    PerlCallback m_on_gizmo_scale_uniformly_callback;
 
 public:
     GLCanvas3D(wxGLCanvas* canvas, wxGLContext* context);
@@ -542,6 +547,7 @@ public:
     void register_on_instance_moved_callback(void* callback);
     void register_on_wipe_tower_moved_callback(void* callback);
     void register_on_enable_action_buttons_callback(void* callback);
+    void register_on_gizmo_scale_uniformly_callback(void* callback);
 
     void bind_event_handlers();
     void unbind_event_handlers();
@@ -622,6 +628,8 @@ private:
     void _on_move(const std::vector<int>& volume_idxs);
     void _on_select(int volume_idx);
 
+    void _update_gizmos_data();
+
     static std::vector<float> _parse_colors(const std::vector<std::string>& colors);
 };
 
diff --git a/xs/src/slic3r/GUI/GLCanvas3DManager.cpp b/xs/src/slic3r/GUI/GLCanvas3DManager.cpp
index 97af89fb7..f288ee456 100644
--- a/xs/src/slic3r/GUI/GLCanvas3DManager.cpp
+++ b/xs/src/slic3r/GUI/GLCanvas3DManager.cpp
@@ -678,6 +678,13 @@ void GLCanvas3DManager::register_on_enable_action_buttons_callback(wxGLCanvas* c
         it->second->register_on_enable_action_buttons_callback(callback);
 }
 
+void GLCanvas3DManager::register_on_gizmo_scale_uniformly_callback(wxGLCanvas* canvas, void* callback)
+{
+    CanvasesMap::iterator it = _get_canvas(canvas);
+    if (it != m_canvases.end())
+        it->second->register_on_gizmo_scale_uniformly_callback(callback);
+}
+
 GLCanvas3DManager::CanvasesMap::iterator GLCanvas3DManager::_get_canvas(wxGLCanvas* canvas)
 {
     return (canvas == nullptr) ? m_canvases.end() : m_canvases.find(canvas);
diff --git a/xs/src/slic3r/GUI/GLCanvas3DManager.hpp b/xs/src/slic3r/GUI/GLCanvas3DManager.hpp
index 95bd2af80..6989da791 100644
--- a/xs/src/slic3r/GUI/GLCanvas3DManager.hpp
+++ b/xs/src/slic3r/GUI/GLCanvas3DManager.hpp
@@ -152,6 +152,7 @@ public:
     void register_on_instance_moved_callback(wxGLCanvas* canvas, void* callback);
     void register_on_wipe_tower_moved_callback(wxGLCanvas* canvas, void* callback);
     void register_on_enable_action_buttons_callback(wxGLCanvas* canvas, void* callback);
+    void register_on_gizmo_scale_uniformly_callback(wxGLCanvas* canvas, void* callback);
 
 private:
     CanvasesMap::iterator _get_canvas(wxGLCanvas* canvas);
diff --git a/xs/src/slic3r/GUI/GLGizmo.cpp b/xs/src/slic3r/GUI/GLGizmo.cpp
index 706c41675..d3aae33e8 100644
--- a/xs/src/slic3r/GUI/GLGizmo.cpp
+++ b/xs/src/slic3r/GUI/GLGizmo.cpp
@@ -115,8 +115,7 @@ void GLGizmoBase::set_hover_id(int id)
 
 void GLGizmoBase::start_dragging()
 {
-    if (m_hover_id != -1)
-        m_start_drag_position = m_grabbers[m_hover_id].center;
+    on_start_dragging();
 }
 
 void GLGizmoBase::update(const Pointf& mouse_pos)
@@ -135,6 +134,10 @@ void GLGizmoBase::render_for_picking(const BoundingBoxf3& box) const
     on_render_for_picking(box);
 }
 
+void GLGizmoBase::on_start_dragging()
+{
+}
+
 void GLGizmoBase::render_grabbers() const
 {
     for (unsigned int i = 0; i < (unsigned int)m_grabbers.size(); ++i)
@@ -156,8 +159,6 @@ const float GLGizmoRotate::GrabberOffset = 5.0f;
 
 GLGizmoRotate::GLGizmoRotate()
     : GLGizmoBase()
-//    , m_angle_x(0.0f)
-//    , m_angle_y(0.0f)
     , m_angle_z(0.0f)
     , m_center(Pointf(0.0, 0.0))
     , m_radius(0.0f)
@@ -332,7 +333,7 @@ void GLGizmoRotate::_render_grabber() const
     ::glVertex3f((GLfloat)m_grabbers[0].center.x, (GLfloat)m_grabbers[0].center.y, 0.0f);
     ::glEnd();
 
-    ::memcpy((void*)m_grabbers[0].color, (const void*)HighlightColor, 4 * sizeof(float));
+    ::memcpy((void*)m_grabbers[0].color, (const void*)HighlightColor, 3 * sizeof(float));
     render_grabbers();
 }
 
@@ -340,12 +341,21 @@ const float GLGizmoScale::Offset = 5.0f;
 
 GLGizmoScale::GLGizmoScale()
     : GLGizmoBase()
-    , m_scale_x(1.0f)
-    , m_scale_y(1.0f)
-    , m_scale_z(1.0f)
+    , m_scale(1.0f)
+    , m_starting_scale(1.0f)
 {
 }
 
+float GLGizmoScale::get_scale() const
+{
+    return m_scale;
+}
+
+void GLGizmoScale::set_scale(float scale)
+{
+    m_starting_scale = scale;
+}
+
 bool GLGizmoScale::on_init()
 {
     std::string path = resources_dir() + "/icons/overlay/";
@@ -370,17 +380,21 @@ bool GLGizmoScale::on_init()
     return true;
 }
 
+void GLGizmoScale::on_start_dragging()
+{
+    if (m_hover_id != -1)
+        m_starting_drag_position = m_grabbers[m_hover_id].center;
+}
+
 void GLGizmoScale::on_update(const Pointf& mouse_pos)
 {
     Pointf center(0.5 * (m_grabbers[1].center.x + m_grabbers[0].center.x), 0.5 * (m_grabbers[3].center.y + m_grabbers[0].center.y));
 
-    coordf_t orig_len = length(m_start_drag_position - center);
+    coordf_t orig_len = length(m_starting_drag_position - center);
     coordf_t new_len = length(mouse_pos - center);
     coordf_t ratio = (orig_len != 0.0) ? new_len / orig_len : 1.0;
 
-    m_scale_x = (float)ratio;
-    m_scale_y = (float)ratio;
-    m_scale_z = (float)ratio;
+    m_scale = m_starting_scale * (float)ratio;
 }
 
 void GLGizmoScale::on_render(const BoundingBoxf3& box) const
@@ -388,14 +402,10 @@ void GLGizmoScale::on_render(const BoundingBoxf3& box) const
     ::glDisable(GL_LIGHTING);
     ::glDisable(GL_DEPTH_TEST);
 
-    const Pointf3& size = box.size();
-    const Pointf3& center = box.center();
-
-    Pointf half_scaled_size = 0.5 * Pointf((coordf_t)m_scale_x * size.x, (coordf_t)m_scale_y * size.y);
-    coordf_t min_x = center.x - half_scaled_size.x - (coordf_t)Offset;
-    coordf_t max_x = center.x + half_scaled_size.x + (coordf_t)Offset;
-    coordf_t min_y = center.y - half_scaled_size.y - (coordf_t)Offset;
-    coordf_t max_y = center.y + half_scaled_size.y + (coordf_t)Offset;
+    coordf_t min_x = box.min.x - (coordf_t)Offset;
+    coordf_t max_x = box.max.x + (coordf_t)Offset;
+    coordf_t min_y = box.min.y - (coordf_t)Offset;
+    coordf_t max_y = box.max.y + (coordf_t)Offset;
 
     m_grabbers[0].center.x = min_x;
     m_grabbers[0].center.y = min_y;
@@ -419,7 +429,7 @@ void GLGizmoScale::on_render(const BoundingBoxf3& box) const
     // draw grabbers
     for (unsigned int i = 0; i < 4; ++i)
     {
-        ::memcpy((void*)m_grabbers[i].color, (const void*)HighlightColor, 4 * sizeof(float));
+        ::memcpy((void*)m_grabbers[i].color, (const void*)HighlightColor, 3 * sizeof(float));
     }
     render_grabbers();
 }
diff --git a/xs/src/slic3r/GUI/GLGizmo.hpp b/xs/src/slic3r/GUI/GLGizmo.hpp
index 432a20958..2baec8f9b 100644
--- a/xs/src/slic3r/GUI/GLGizmo.hpp
+++ b/xs/src/slic3r/GUI/GLGizmo.hpp
@@ -47,7 +47,6 @@ protected:
     GLTexture m_textures[Num_States];
     int m_hover_id;
     mutable std::vector<Grabber> m_grabbers;
-    Pointf m_start_drag_position;
 
 public:
     GLGizmoBase();
@@ -72,6 +71,7 @@ public:
 
 protected:
     virtual bool on_init() = 0;
+    virtual void on_start_dragging();
     virtual void on_update(const Pointf& mouse_pos) = 0;
     virtual void on_render(const BoundingBoxf3& box) const = 0;
     virtual void on_render_for_picking(const BoundingBoxf3& box) const = 0;
@@ -92,8 +92,6 @@ class GLGizmoRotate : public GLGizmoBase
     static const unsigned int SnapRegionsCount;
     static const float GrabberOffset;
 
-//    float m_angle_x;
-//    float m_angle_y;
     float m_angle_z;
 
     mutable Pointf m_center;
@@ -121,15 +119,20 @@ class GLGizmoScale : public GLGizmoBase
 {
     static const float Offset;
 
-    float m_scale_x;
-    float m_scale_y;
-    float m_scale_z;
+    float m_scale;
+
+    Pointf m_starting_drag_position;
+    float m_starting_scale;
 
 public:
     GLGizmoScale();
 
+    float get_scale() const;
+    void set_scale(float scale);
+
 protected:
     virtual bool on_init();
+    virtual void on_start_dragging();
     virtual void on_update(const Pointf& mouse_pos);
     virtual void on_render(const BoundingBoxf3& box) const;
     virtual void on_render_for_picking(const BoundingBoxf3& box) const;
diff --git a/xs/xsp/GUI_3DScene.xsp b/xs/xsp/GUI_3DScene.xsp
index 426395ef2..29f35293b 100644
--- a/xs/xsp/GUI_3DScene.xsp
+++ b/xs/xsp/GUI_3DScene.xsp
@@ -598,6 +598,13 @@ register_on_enable_action_buttons_callback(canvas, callback)
     CODE:
         _3DScene::register_on_enable_action_buttons_callback((wxGLCanvas*)wxPli_sv_2_object(aTHX_ canvas, "Wx::GLCanvas"), (void*)callback);
 
+void
+register_on_gizmo_scale_uniformly_callback(canvas, callback)
+        SV *canvas;
+        SV *callback;
+    CODE:
+        _3DScene::register_on_gizmo_scale_uniformly_callback((wxGLCanvas*)wxPli_sv_2_object(aTHX_ canvas, "Wx::GLCanvas"), (void*)callback);
+
 unsigned int
 finalize_legend_texture()
     CODE: