diff --git a/src/libslic3r/Geometry.cpp b/src/libslic3r/Geometry.cpp
index c45f087919..a100f520a9 100644
--- a/src/libslic3r/Geometry.cpp
+++ b/src/libslic3r/Geometry.cpp
@@ -1166,7 +1166,11 @@ MedialAxis::retrieve_endpoint(const VD::cell_type* cell) const
     }
 }
 
+#if ENABLE_MIRROR
+void assemble_transform(Transform3d& transform, const Vec3d& translation, const Vec3d& rotation, const Vec3d& scale, const Vec3d& mirror)
+#else
 void assemble_transform(Transform3d& transform, const Vec3d& translation, const Vec3d& rotation, const Vec3d& scale)
+#endif // ENABLE_MIRROR
 {
     transform = Transform3d::Identity();
     transform.translate(translation);
@@ -1174,12 +1178,23 @@ void assemble_transform(Transform3d& transform, const Vec3d& translation, const
     transform.rotate(Eigen::AngleAxisd(rotation(1), Vec3d::UnitY()));
     transform.rotate(Eigen::AngleAxisd(rotation(0), Vec3d::UnitX()));
     transform.scale(scale);
+#if ENABLE_MIRROR
+    transform.scale(mirror);
+#endif // ENABLE_MIRROR
 }
 
+#if ENABLE_MIRROR
+Transform3d assemble_transform(const Vec3d& translation, const Vec3d& rotation, const Vec3d& scale, const Vec3d& mirror)
+#else
 Transform3d assemble_transform(const Vec3d& translation, const Vec3d& rotation, const Vec3d& scale)
+#endif // ENABLE_MIRROR
 {
     Transform3d transform;
+#if ENABLE_MIRROR
+    assemble_transform(transform, translation, rotation, scale, mirror);
+#else
     assemble_transform(transform, translation, rotation, scale);
+#endif // ENABLE_MIRROR
     return transform;
 }
 
diff --git a/src/libslic3r/Geometry.hpp b/src/libslic3r/Geometry.hpp
index 35f59bdfd7..9046add258 100644
--- a/src/libslic3r/Geometry.hpp
+++ b/src/libslic3r/Geometry.hpp
@@ -158,20 +158,40 @@ class MedialAxis {
 };
 
 // Sets the given transform by assembling the given transformations in the following order:
+#if ENABLE_MIRROR
+// 1) mirror
+// 2) scale
+// 3) rotate X
+// 4) rotate Y
+// 5) rotate Z
+// 6) translate
+void assemble_transform(Transform3d& transform, const Vec3d& translation = Vec3d::Zero(), const Vec3d& rotation = Vec3d::Zero(), const Vec3d& scale = Vec3d::Ones(), const Vec3d& mirror = Vec3d::Ones());
+#else
 // 1) scale
 // 2) rotate X
 // 3) rotate Y
 // 4) rotate Z
 // 5) translate
 void assemble_transform(Transform3d& transform, const Vec3d& translation = Vec3d::Zero(), const Vec3d& rotation = Vec3d::Zero(), const Vec3d& scale = Vec3d::Ones());
+#endif // ENABLE_MIRROR
 
 // Returns the transform obtained by assembling the given transformations in the following order:
+#if ENABLE_MIRROR
+// 1) mirror
+// 2) scale
+// 3) rotate X
+// 4) rotate Y
+// 5) rotate Z
+// 6) translate
+Transform3d assemble_transform(const Vec3d& translation = Vec3d::Zero(), const Vec3d& rotation = Vec3d::Zero(), const Vec3d& scale = Vec3d::Ones(), const Vec3d& mirror = Vec3d::Ones());
+#else
 // 1) scale
 // 2) rotate X
 // 3) rotate Y
 // 4) rotate Z
 // 5) translate
 Transform3d assemble_transform(const Vec3d& translation = Vec3d::Zero(), const Vec3d& rotation = Vec3d::Zero(), const Vec3d& scale = Vec3d::Ones());
+#endif // ENABLE_MIRROR
 
 // Returns the euler angles extracted from the given rotation matrix
 // Warning -> The matrix should not contain any scale or shear !!!
diff --git a/src/libslic3r/Model.cpp b/src/libslic3r/Model.cpp
index dc2c37c7fd..8e2d1f391c 100644
--- a/src/libslic3r/Model.cpp
+++ b/src/libslic3r/Model.cpp
@@ -1080,6 +1080,38 @@ void ModelInstance::set_rotation(Axis axis, double rotation)
     m_rotation(axis) = rotation;
 }
 
+#if ENABLE_MIRROR
+void ModelInstance::set_scaling_factor(const Vec3d& scaling_factor)
+{
+    set_scaling_factor(X, scaling_factor(0));
+    set_scaling_factor(Y, scaling_factor(1));
+    set_scaling_factor(Z, scaling_factor(2));
+}
+
+void ModelInstance::set_scaling_factor(Axis axis, double scaling_factor)
+{
+    m_scaling_factor(axis) = std::abs(scaling_factor);
+}
+
+void ModelInstance::set_mirror(const Vec3d& mirror)
+{
+    set_mirror(X, mirror(0));
+    set_mirror(Y, mirror(1));
+    set_mirror(Z, mirror(2));
+}
+
+void ModelInstance::set_mirror(Axis axis, double mirror)
+{
+    double abs_mirror = std::abs(mirror);
+    if (abs_mirror == 0.0)
+        mirror = 1.0;
+    else if (abs_mirror != 1.0)
+        mirror /= abs_mirror;
+
+    m_mirror(axis) = mirror;
+}
+#endif // ENABLE_MIRROR
+
 void ModelInstance::transform_mesh(TriangleMesh* mesh, bool dont_translate) const
 {
     mesh->transform(world_matrix(dont_translate).cast<float>());
@@ -1130,12 +1162,21 @@ void ModelInstance::transform_polygon(Polygon* polygon) const
     polygon->scale(this->m_scaling_factor(0), this->m_scaling_factor(1));           // scale around polygon origin
 }
 
+#if ENABLE_MIRROR
+Transform3d ModelInstance::world_matrix(bool dont_translate, bool dont_rotate, bool dont_scale, bool dont_mirror) const
+#else
 Transform3d ModelInstance::world_matrix(bool dont_translate, bool dont_rotate, bool dont_scale) const
+#endif // ENABLE_MIRROR
 {
     Vec3d translation = dont_translate ? Vec3d::Zero() : m_offset;
     Vec3d rotation = dont_rotate ? Vec3d::Zero() : m_rotation;
     Vec3d scale = dont_scale ? Vec3d::Ones() : m_scaling_factor;
+#if ENABLE_MIRROR
+    Vec3d mirror = dont_mirror ? Vec3d::Ones() : m_mirror;
+    return Geometry::assemble_transform(translation, rotation, scale, mirror);
+#else
     return Geometry::assemble_transform(translation, rotation, scale);
+#endif // ENABLE_MIRROR
 }
 
 }
diff --git a/src/libslic3r/Model.hpp b/src/libslic3r/Model.hpp
index 7fd889ffb8..6c34292d31 100644
--- a/src/libslic3r/Model.hpp
+++ b/src/libslic3r/Model.hpp
@@ -251,6 +251,9 @@ private:
     Vec3d m_offset;              // in unscaled coordinates
     Vec3d m_rotation;            // Rotation around the three axes, in radians around mesh center point
     Vec3d m_scaling_factor;      // Scaling factors along the three axes
+#if ENABLE_MIRROR
+    Vec3d m_mirror;              // Mirroring along the three axes
+#endif // ENABLE_MIRROR
 
 public:
     // flag showing the position of this instance with respect to the print volume (set by Print::validate() using ModelObject::check_instances_print_volume_state())
@@ -273,8 +276,21 @@ public:
     Vec3d get_scaling_factor() const { return m_scaling_factor; }
     double get_scaling_factor(Axis axis) const { return m_scaling_factor(axis); }
 
+#if ENABLE_MIRROR
+    void set_scaling_factor(const Vec3d& scaling_factor);
+    void set_scaling_factor(Axis axis, double scaling_factor);
+#else
     void set_scaling_factor(const Vec3d& scaling_factor) { m_scaling_factor = scaling_factor; }
     void set_scaling_factor(Axis axis, double scaling_factor) { m_scaling_factor(axis) = scaling_factor; }
+#endif // ENABLE_MIRROR
+
+#if ENABLE_MIRROR
+    const Vec3d& get_mirror() const { return m_mirror; }
+    double get_mirror(Axis axis) const { return m_mirror(axis); }
+
+    void set_mirror(const Vec3d& mirror);
+    void set_mirror(Axis axis, double mirror);
+#endif // ENABLE_MIRROR
 
     // To be called on an external mesh
     void transform_mesh(TriangleMesh* mesh, bool dont_translate = false) const;
@@ -287,7 +303,11 @@ public:
     // To be called on an external polygon. It does not translate the polygon, only rotates and scales.
     void transform_polygon(Polygon* polygon) const;
 
+#if ENABLE_MIRROR
+    Transform3d world_matrix(bool dont_translate = false, bool dont_rotate = false, bool dont_scale = false, bool dont_mirror = false) const;
+#else
     Transform3d world_matrix(bool dont_translate = false, bool dont_rotate = false, bool dont_scale = false) const;
+#endif // ENABLE_MIRROR
 
     bool is_printable() const { return print_volume_state == PVS_Inside; }
 
@@ -295,9 +315,15 @@ private:
     // Parent object, owning this instance.
     ModelObject* object;
 
+#if ENABLE_MIRROR
+    ModelInstance(ModelObject *object) : m_offset(Vec3d::Zero()), m_rotation(Vec3d::Zero()), m_scaling_factor(Vec3d::Ones()), m_mirror(Vec3d::Ones()), object(object), print_volume_state(PVS_Inside) {}
+    ModelInstance(ModelObject *object, const ModelInstance &other) :
+        m_offset(other.m_offset), m_rotation(other.m_rotation), m_scaling_factor(other.m_scaling_factor), m_mirror(other.m_mirror), object(object), print_volume_state(PVS_Inside) {}
+#else
     ModelInstance(ModelObject *object) : m_rotation(Vec3d::Zero()), m_scaling_factor(Vec3d::Ones()), m_offset(Vec3d::Zero()), object(object), print_volume_state(PVS_Inside) {}
     ModelInstance(ModelObject *object, const ModelInstance &other) :
         m_rotation(other.m_rotation), m_scaling_factor(other.m_scaling_factor), m_offset(other.m_offset), object(object), print_volume_state(PVS_Inside) {}
+#endif // ENABLE_MIRROR
 };
 
 
diff --git a/src/libslic3r/Technologies.hpp b/src/libslic3r/Technologies.hpp
index 4c653e543e..3f8fd80f0b 100644
--- a/src/libslic3r/Technologies.hpp
+++ b/src/libslic3r/Technologies.hpp
@@ -10,6 +10,8 @@
 #define ENABLE_USE_UNIQUE_GLCONTEXT (1 && ENABLE_1_42_0)
 // New selections
 #define ENABLE_EXTENDED_SELECTION (1 && ENABLE_1_42_0)
+// Add mirror components along the three axes in ModelInstance and GLVolume
+#define ENABLE_MIRROR (0 && ENABLE_1_42_0)
 
 #endif // _technologies_h_
 
diff --git a/src/slic3r/GUI/3DScene.cpp b/src/slic3r/GUI/3DScene.cpp
index 402d7b8ee9..91f60947c5 100644
--- a/src/slic3r/GUI/3DScene.cpp
+++ b/src/slic3r/GUI/3DScene.cpp
@@ -198,6 +198,9 @@ GLVolume::GLVolume(float r, float g, float b, float a)
     : m_offset(Vec3d::Zero())
     , m_rotation(Vec3d::Zero())
     , m_scaling_factor(Vec3d::Ones())
+#if ENABLE_MIRROR
+    , m_mirror(Vec3d::Ones())
+#endif // ENABLE_MIRROR
     , m_world_matrix(Transform3f::Identity())
     , m_world_matrix_dirty(true)
     , m_transformed_bounding_box_dirty(true)
@@ -324,6 +327,40 @@ void GLVolume::set_scaling_factor(const Vec3d& scaling_factor)
     }
 }
 
+#if ENABLE_MIRROR
+const Vec3d& GLVolume::get_mirror() const
+{
+    return m_mirror;
+}
+
+double GLVolume::get_mirror(Axis axis) const
+{
+    return m_mirror(axis);
+}
+
+void GLVolume::set_mirror(const Vec3d& mirror)
+{
+    if (m_mirror != mirror)
+    {
+        m_mirror = mirror;
+        m_world_matrix_dirty = true;
+        m_transformed_bounding_box_dirty = true;
+        m_transformed_convex_hull_bounding_box_dirty = true;
+    }
+}
+
+void GLVolume::set_mirror(Axis axis, double mirror)
+{
+    if (m_mirror(axis) != mirror)
+    {
+        m_mirror(axis) = mirror;
+        m_world_matrix_dirty = true;
+        m_transformed_bounding_box_dirty = true;
+        m_transformed_convex_hull_bounding_box_dirty = true;
+    }
+}
+#endif // ENABLE_MIRROR
+
 void GLVolume::set_convex_hull(const TriangleMesh& convex_hull)
 {
     m_convex_hull = &convex_hull;
@@ -353,7 +390,11 @@ const Transform3f& GLVolume::world_matrix() const
 {
     if (m_world_matrix_dirty)
     {
+#if ENABLE_MIRROR
+        m_world_matrix = Geometry::assemble_transform(m_offset, m_rotation, m_scaling_factor, m_mirror).cast<float>();
+#else
         m_world_matrix = Geometry::assemble_transform(m_offset, m_rotation, m_scaling_factor).cast<float>();
+#endif // ENABLE_MIRROR
         m_world_matrix_dirty = false;
     }
     return m_world_matrix;
@@ -729,6 +770,9 @@ std::vector<int> GLVolumeCollection::load_object(
             v.set_offset(instance->get_offset());
             v.set_rotation(instance->get_rotation());
             v.set_scaling_factor(instance->get_scaling_factor());
+#if ENABLE_MIRROR
+            v.set_mirror(instance->get_mirror());
+#endif // ENABLE_MIRROR
         }
     }
     
@@ -2076,6 +2120,15 @@ int _3DScene::get_in_object_volume_id(wxGLCanvas* canvas, int scene_vol_idx)
     return s_canvas_mgr.get_in_object_volume_id(canvas, scene_vol_idx);
 }
 
+#if ENABLE_MIRROR
+#if ENABLE_EXTENDED_SELECTION
+void _3DScene::mirror_selection(wxGLCanvas* canvas, Axis axis)
+{
+    s_canvas_mgr.mirror_selection(canvas, axis);
+}
+#endif // ENABLE_EXTENDED_SELECTION
+#endif // ENABLE_MIRROR
+
 void _3DScene::reload_scene(wxGLCanvas* canvas, bool force)
 {
     s_canvas_mgr.reload_scene(canvas, force);
diff --git a/src/slic3r/GUI/3DScene.hpp b/src/slic3r/GUI/3DScene.hpp
index e3f7ea0d36..7e74ff92f2 100644
--- a/src/slic3r/GUI/3DScene.hpp
+++ b/src/slic3r/GUI/3DScene.hpp
@@ -260,6 +260,10 @@ private:
     Vec3d                 m_rotation;
     // Scale factor along the three axes of the volume to be rendered.
     Vec3d                 m_scaling_factor;
+#if ENABLE_MIRROR
+    // Mirroring along the three axes of the volume to be rendered.
+    Vec3d m_mirror;
+#endif // ENABLE_MIRROR
     // World matrix of the volume to be rendered.
     mutable Transform3f   m_world_matrix;
     // Whether or not is needed to recalculate the world matrix.
@@ -337,6 +341,13 @@ public:
 #endif // ENABLE_EXTENDED_SELECTION
     void set_scaling_factor(const Vec3d& scaling_factor);
 
+#if ENABLE_MIRROR
+    const Vec3d& get_mirror() const;
+    double get_mirror(Axis axis) const;
+    void set_mirror(const Vec3d& mirror);
+    void set_mirror(Axis axis, double mirror);
+#endif // ENABLE_MIRROR
+
     const Vec3d& get_offset() const;
     void set_offset(const Vec3d& offset);
 
@@ -581,6 +592,12 @@ public:
     static int get_first_volume_id(wxGLCanvas* canvas, int obj_idx);
     static int get_in_object_volume_id(wxGLCanvas* canvas, int scene_vol_idx);
 
+#if ENABLE_MIRROR
+#if ENABLE_EXTENDED_SELECTION
+    static void mirror_selection(wxGLCanvas* canvas, Axis axis);
+#endif // ENABLE_EXTENDED_SELECTION
+#endif // ENABLE_MIRROR
+
     static void reload_scene(wxGLCanvas* canvas, bool force);
 
     static void load_gcode_preview(wxGLCanvas* canvas, const GCodePreviewData* preview_data, const std::vector<std::string>& str_tool_colors);
diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 12cd32d560..6dce5cd16c 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -1457,6 +1457,25 @@ void GLCanvas3D::Selection::scale(const Vec3d& scale)
     m_bounding_box_dirty = true;
 }
 
+#if ENABLE_MIRROR
+void GLCanvas3D::Selection::mirror(Axis axis)
+{
+    if (!m_valid)
+        return;
+
+    for (unsigned int i : m_list)
+    {
+        if (is_single_full_instance())
+            (*m_volumes)[i]->set_mirror(axis, -(*m_volumes)[i]->get_mirror(axis));
+    }
+
+    if (m_mode == Instance)
+        _synchronize_unselected_instances();
+
+    m_bounding_box_dirty = true;
+}
+#endif // ENABLE_MIRROR
+
 void GLCanvas3D::Selection::render(bool show_indirect_selection) const
 {
     if (is_empty())
@@ -1780,6 +1799,9 @@ void GLCanvas3D::Selection::_synchronize_unselected_instances()
         int instance_idx = volume->instance_idx();
         const Vec3d& rotation = volume->get_rotation();
         const Vec3d& scaling_factor = volume->get_scaling_factor();
+#if ENABLE_MIRROR
+        const Vec3d& mirror = volume->get_mirror();
+#endif // ENABLE_MIRROR
 
         // Process unselected instances.
         for (unsigned int j = 0; j < (unsigned int)m_volumes->size(); ++j)
@@ -1796,6 +1818,9 @@ void GLCanvas3D::Selection::_synchronize_unselected_instances()
 
             v->set_rotation(rotation);
             v->set_scaling_factor(scaling_factor);
+#if ENABLE_MIRROR
+            v->set_mirror(mirror);
+#endif // ENABLE_MIRROR
 
             done.insert(j);
         }
@@ -3403,6 +3428,18 @@ int GLCanvas3D::get_in_object_volume_id(int scene_vol_idx) const
     return ((0 <= scene_vol_idx) && (scene_vol_idx < (int)m_volumes.volumes.size())) ? m_volumes.volumes[scene_vol_idx]->volume_idx() : -1;
 }
 
+#if ENABLE_MIRROR
+#if ENABLE_EXTENDED_SELECTION
+void GLCanvas3D::mirror_selection(Axis axis)
+{
+    m_regenerate_volumes = false;
+    m_selection.mirror(axis);
+    _on_mirror();
+    wxGetApp().obj_manipul()->update_settings_value(m_selection);
+}
+#endif // ENABLE_EXTENDED_SELECTION
+#endif // ENABLE_MIRROR
+
 void GLCanvas3D::reload_scene(bool force)
 {
     if ((m_canvas == nullptr) || (m_config == nullptr) || (m_model == nullptr))
@@ -6525,6 +6562,41 @@ void GLCanvas3D::_on_flatten()
     _on_rotate();
 }
 
+#if ENABLE_MIRROR
+void GLCanvas3D::_on_mirror()
+{
+    if (m_model == nullptr)
+        return;
+
+    std::set<std::pair<int, int>> done;  // prevent mirroring instances twice
+
+    for (const GLVolume* v : m_volumes.volumes)
+    {
+        int object_idx = v->object_idx();
+        if (object_idx >= 1000)
+            continue;
+
+        int instance_idx = v->instance_idx();
+
+        // prevent mirroring instances twice
+        std::pair<int, int> done_id(object_idx, instance_idx);
+        if (done.find(done_id) != done.end())
+            continue;
+
+        done.insert(done_id);
+
+        // Mirror instances.
+        ModelObject* model_object = m_model->objects[object_idx];
+        if (model_object != nullptr)
+        {
+            model_object->instances[instance_idx]->set_mirror(v->get_mirror());
+            model_object->invalidate_bounding_box();
+        }
+    }
+
+    // schedule_background_process
+}
+#endif // ENABLE_MIRROR
 #else
 void GLCanvas3D::_on_move(const std::vector<int>& volume_idxs)
 {
diff --git a/src/slic3r/GUI/GLCanvas3D.hpp b/src/slic3r/GUI/GLCanvas3D.hpp
index c4e53cfe2f..58b414c8d9 100644
--- a/src/slic3r/GUI/GLCanvas3D.hpp
+++ b/src/slic3r/GUI/GLCanvas3D.hpp
@@ -501,6 +501,9 @@ public:
         void translate(const Vec3d& displacement);
         void rotate(const Vec3d& rotation);
         void scale(const Vec3d& scale);
+#if ENABLE_MIRROR
+        void mirror(Axis axis);
+#endif // ENABLE_MIRROR
 
         void render(bool show_indirect_selection) const;
 
@@ -833,6 +836,12 @@ public:
     int get_first_volume_id(int obj_idx) const;
     int get_in_object_volume_id(int scene_vol_idx) const;
 
+#if ENABLE_MIRROR
+#if ENABLE_EXTENDED_SELECTION
+    void mirror_selection(Axis axis);
+#endif // ENABLE_EXTENDED_SELECTION
+#endif // ENABLE_MIRROR
+
     void reload_scene(bool force);
 
     void load_gcode_preview(const GCodePreviewData& preview_data, const std::vector<std::string>& str_tool_colors);
@@ -955,6 +964,9 @@ private:
     void _on_rotate();
     void _on_scale();
     void _on_flatten();
+#if ENABLE_MIRROR
+    void _on_mirror();
+#endif // ENABLE_MIRROR
 #else
     void _on_move(const std::vector<int>& volume_idxs);
 #endif // ENABLE_EXTENDED_SELECTION
diff --git a/src/slic3r/GUI/GLCanvas3DManager.cpp b/src/slic3r/GUI/GLCanvas3DManager.cpp
index 182298a690..1d963e3b7b 100644
--- a/src/slic3r/GUI/GLCanvas3DManager.cpp
+++ b/src/slic3r/GUI/GLCanvas3DManager.cpp
@@ -596,6 +596,17 @@ int GLCanvas3DManager::get_in_object_volume_id(wxGLCanvas* canvas, int scene_vol
     return (it != m_canvases.end()) ? it->second->get_in_object_volume_id(scene_vol_idx) : -1;
 }
 
+#if ENABLE_MIRROR
+#if ENABLE_EXTENDED_SELECTION
+void GLCanvas3DManager::mirror_selection(wxGLCanvas* canvas, Axis axis)
+{
+    CanvasesMap::iterator it = _get_canvas(canvas);
+    if (it != m_canvases.end())
+        it->second->mirror_selection(axis);
+}
+#endif // ENABLE_EXTENDED_SELECTION
+#endif // ENABLE_MIRROR
+
 void GLCanvas3DManager::reload_scene(wxGLCanvas* canvas, bool force)
 {
     CanvasesMap::iterator it = _get_canvas(canvas);
diff --git a/src/slic3r/GUI/GLCanvas3DManager.hpp b/src/slic3r/GUI/GLCanvas3DManager.hpp
index 2261a57b2b..89cb09e7f0 100644
--- a/src/slic3r/GUI/GLCanvas3DManager.hpp
+++ b/src/slic3r/GUI/GLCanvas3DManager.hpp
@@ -163,6 +163,12 @@ public:
     int get_first_volume_id(wxGLCanvas* canvas, int obj_idx) const;
     int get_in_object_volume_id(wxGLCanvas* canvas, int scene_vol_idx) const;
 
+#if ENABLE_MIRROR
+#if ENABLE_EXTENDED_SELECTION
+    void mirror_selection(wxGLCanvas* canvas, Axis axis);
+#endif // ENABLE_EXTENDED_SELECTION
+#endif // ENABLE_MIRROR
+
     void reload_scene(wxGLCanvas* canvas, bool force);
 
     void load_gcode_preview(wxGLCanvas* canvas, const GCodePreviewData* preview_data, const std::vector<std::string>& str_tool_colors);
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 7981d66634..40fffc85ba 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -1519,6 +1519,11 @@ void Plater::priv::rotate()
 
 void Plater::priv::mirror(Axis axis)
 {
+#if ENABLE_MIRROR
+#if ENABLE_EXTENDED_SELECTION
+    _3DScene::mirror_selection(canvas3D, axis);
+#endif // ENABLE_EXTENDED_SELECTION
+#else
 #if ENABLE_EXTENDED_SELECTION
     int obj_idx = get_selected_object_idx();
     if (obj_idx == -1)
@@ -1551,6 +1556,7 @@ void Plater::priv::mirror(Axis axis)
 #endif // ENABLE_EXTENDED_SELECTION
     selection_changed();
     update();
+#endif // ENABLE_MIRROR
 }
 
 #if !ENABLE_EXTENDED_SELECTION