diff --git a/xs/src/libslic3r/Model.cpp b/xs/src/libslic3r/Model.cpp
index 2e6ed3b24..255ebd49b 100644
--- a/xs/src/libslic3r/Model.cpp
+++ b/xs/src/libslic3r/Model.cpp
@@ -1050,11 +1050,11 @@ ModelVolume::assign_unique_material()
 
 
 ModelInstance::ModelInstance(ModelObject *object)
-:   rotation(0), x_rotation(0), y_rotation(0), scaling_factor(1),scaling_vector(Pointf3(1,1,1)), z_translation(0), object(object)
+:   rotation(0), scaling_factor(1), object(object)
 {}
 
 ModelInstance::ModelInstance(ModelObject *object, const ModelInstance &other)
-:   rotation(other.rotation), x_rotation(other.x_rotation), y_rotation(other.y_rotation), scaling_factor(other.scaling_factor), scaling_vector(other.scaling_vector), offset(other.offset), z_translation(other.z_translation), object(object)
+:   rotation(other.rotation), scaling_factor(other.scaling_factor), offset(other.offset), object(object)
 {}
 
 ModelInstance& ModelInstance::operator= (ModelInstance other)
@@ -1083,6 +1083,18 @@ ModelInstance::transform_mesh(TriangleMesh* mesh, bool dont_translate) const
 
 }
 
+TransformationMatrix ModelInstance::get_trafo_matrix(bool dont_translate) const
+{
+    TransformationMatrix trafo = TransformationMatrix();
+    trafo.scale(this->scaling_factor);
+    trafo.rotate(this->rotation, Axis::Z);
+    if(!dont_translate)
+    {
+        trafo.translate(this->offset.x, this->offset.y, 0);
+    }
+    return trafo;
+}
+
 BoundingBoxf3 ModelInstance::transform_mesh_bounding_box(const TriangleMesh* mesh, bool dont_translate) const
 {
     // rotate around mesh origin
diff --git a/xs/src/libslic3r/Model.hpp b/xs/src/libslic3r/Model.hpp
index 5c4800aad..371a33c73 100644
--- a/xs/src/libslic3r/Model.hpp
+++ b/xs/src/libslic3r/Model.hpp
@@ -543,6 +543,10 @@ class ModelInstance
     /// \param dont_translate bool whether to translate the mesh or not
     void transform_mesh(TriangleMesh* mesh, bool dont_translate = false) const;
 
+    /// Returns the TransformationMatrix defined by the instance's Transform an external TriangleMesh to the returned TriangleMesh object
+    /// \param dont_translate bool whether to translate the mesh or not
+    TransformationMatrix get_trafo_matrix(bool dont_translate = false) const;
+
     /// Calculate a bounding box of a transformed mesh. To be called on an external mesh.
     /// \param mesh TriangleMesh* pointer to the the mesh
     /// \param dont_translate bool whether to translate the bounding box or not