diff --git a/lib/Slic3r/GUI/MainFrame.pm b/lib/Slic3r/GUI/MainFrame.pm
index 058facbb4..86e4e18c6 100644
--- a/lib/Slic3r/GUI/MainFrame.pm
+++ b/lib/Slic3r/GUI/MainFrame.pm
@@ -206,6 +206,18 @@ sub _init_menubar {
             $plater->rotate(undef, Z);
         });
         
+        my $flipMenu = Wx::Menu->new;
+        $self->{object_menu}->AppendSubMenu($flipMenu, "Flip…", 'Mirror the selected object');
+        $self->_append_menu_item($flipMenu, "Along X axis…", 'Mirror the selected object along the X axis', sub {
+            $plater->flip(X);
+        });
+        $self->_append_menu_item($flipMenu, "Along Y axis…", 'Mirror the selected object along the Y axis', sub {
+            $plater->flip(Y);
+        });
+        $self->_append_menu_item($flipMenu, "Along Z axis…", 'Mirror the selected object along the Z axis', sub {
+            $plater->flip(Z);
+        });
+        
         $self->_append_menu_item($self->{object_menu}, "Scale…", 'Scale the selected object by an arbitrary factor', sub {
             $plater->changescale;
         });
diff --git a/lib/Slic3r/GUI/Plater.pm b/lib/Slic3r/GUI/Plater.pm
index 82497ef1f..322929d80 100644
--- a/lib/Slic3r/GUI/Plater.pm
+++ b/lib/Slic3r/GUI/Plater.pm
@@ -578,8 +578,8 @@ sub rotate {
         } else {
             # rotation around X and Y needs to be performed on mesh
             # so we first apply any Z rotation
-            if ($model_object->instances->[0]->rotation != 0) {
-                $model_object->rotate(deg2rad($model_object->instances->[0]->rotation), Z);
+            if ($model_instance->rotation != 0) {
+                $model_object->rotate(deg2rad($model_instance->rotation), Z);
                 $_->set_rotation(0) for @{ $model_object->instances };
             }
             $model_object->rotate(deg2rad($angle), $axis);
@@ -598,6 +598,35 @@ sub rotate {
     $self->{canvas}->Refresh;
 }
 
+sub flip {
+    my ($self, $axis) = @_;
+    
+    my ($obj_idx, $object) = $self->selected_object;
+    return if !defined $obj_idx;
+    
+    my $model_object = $self->{model}->objects->[$obj_idx];
+    my $model_instance = $model_object->instances->[0];
+    
+    # apply Z rotation before flipping
+    if ($model_instance->rotation != 0) {
+        $model_object->rotate(deg2rad($model_instance->rotation), Z);
+        $_->set_rotation(0) for @{ $model_object->instances };
+    }
+    
+    $model_object->flip($axis);
+    $model_object->update_bounding_box;
+    $self->make_thumbnail($obj_idx);
+        
+    # update print and start background processing
+    $self->stop_background_process;
+    $self->{print}->add_model_object($model_object, $obj_idx);
+    $self->schedule_background_process;
+    
+    $self->selection_changed;  # refresh info (size etc.)
+    $self->update;
+    $self->{canvas}->Refresh;
+}
+
 sub changescale {
     my $self = shift;
     
diff --git a/lib/Slic3r/Model.pm b/lib/Slic3r/Model.pm
index 50393b0d5..3a0d60547 100644
--- a/lib/Slic3r/Model.pm
+++ b/lib/Slic3r/Model.pm
@@ -479,6 +479,19 @@ sub rotate {
     $self->invalidate_bounding_box;
 }
 
+sub flip {
+    my ($self, $axis) = @_;
+    
+    if ($axis == X) {
+        $_->mesh->flip_x for @{$self->volumes};
+    } elsif ($axis == Y) {
+        $_->mesh->flip_y for @{$self->volumes};
+    } elsif ($axis == Z) {
+        $_->mesh->flip_z for @{$self->volumes};
+    }
+    $self->invalidate_bounding_box;
+}
+
 sub materials_count {
     my $self = shift;
     
diff --git a/xs/src/TriangleMesh.cpp b/xs/src/TriangleMesh.cpp
index dc478322f..77b11c5f8 100644
--- a/xs/src/TriangleMesh.cpp
+++ b/xs/src/TriangleMesh.cpp
@@ -193,6 +193,21 @@ void TriangleMesh::rotate_z(float angle)
     stl_rotate_z(&(this->stl), angle);
 }
 
+void TriangleMesh::flip_x()
+{
+    stl_mirror_yz(&this->stl);
+}
+
+void TriangleMesh::flip_y()
+{
+    stl_mirror_xz(&this->stl);
+}
+
+void TriangleMesh::flip_z()
+{
+    stl_mirror_xy(&this->stl);
+}
+
 void TriangleMesh::align_to_origin()
 {
     this->translate(
diff --git a/xs/src/TriangleMesh.hpp b/xs/src/TriangleMesh.hpp
index 0d39453e1..b16f867eb 100644
--- a/xs/src/TriangleMesh.hpp
+++ b/xs/src/TriangleMesh.hpp
@@ -34,6 +34,9 @@ class TriangleMesh
     void rotate_x(float angle);
     void rotate_y(float angle);
     void rotate_z(float angle);
+    void flip_x();
+    void flip_y();
+    void flip_z();
     void align_to_origin();
     void rotate(double angle, Point* center);
     TriangleMeshPtrs split() const;
diff --git a/xs/src/admesh/util.c b/xs/src/admesh/util.c
index a1a90fb19..eec705b9a 100644
--- a/xs/src/admesh/util.c
+++ b/xs/src/admesh/util.c
@@ -295,6 +295,9 @@ stl_mirror_xy(stl_file *stl)
   stl->stats.max.z = temp_size;
   stl->stats.min.z *= -1.0;
   stl->stats.max.z *= -1.0;
+	stl_reverse_all_facets(stl);
+	stl->stats.facets_reversed -= stl->stats.number_of_facets;  // for not altering stats
+	
 }
 
 void
@@ -316,6 +319,8 @@ stl_mirror_yz(stl_file *stl)
   stl->stats.max.x = temp_size;
   stl->stats.min.x *= -1.0;
   stl->stats.max.x *= -1.0;
+	stl_reverse_all_facets(stl);
+	stl->stats.facets_reversed -= stl->stats.number_of_facets;  // for not altering stats
 }
 
 void
@@ -337,6 +342,8 @@ stl_mirror_xz(stl_file *stl)
   stl->stats.max.y = temp_size;
   stl->stats.min.y *= -1.0;
   stl->stats.max.y *= -1.0;
+	stl_reverse_all_facets(stl);
+	stl->stats.facets_reversed -= stl->stats.number_of_facets;  // for not altering stats
 }
 
 static float get_volume(stl_file *stl)
diff --git a/xs/xsp/TriangleMesh.xsp b/xs/xsp/TriangleMesh.xsp
index 3338d971c..5ac5f4349 100644
--- a/xs/xsp/TriangleMesh.xsp
+++ b/xs/xsp/TriangleMesh.xsp
@@ -23,6 +23,9 @@
     void rotate_x(float angle);
     void rotate_y(float angle);
     void rotate_z(float angle);
+    void flip_x();
+    void flip_y();
+    void flip_z();
     void align_to_origin();
     void rotate(double angle, Point* center);
     TriangleMeshPtrs split();