diff --git a/lib/Slic3r/GUI/Plater.pm b/lib/Slic3r/GUI/Plater.pm
index 5d5e3911a..f05c4c1b7 100644
--- a/lib/Slic3r/GUI/Plater.pm
+++ b/lib/Slic3r/GUI/Plater.pm
@@ -704,14 +704,14 @@ sub rotate {
     $self->stop_background_process;
     
     if ($axis == Z) {
-        my $new_angle = $model_instance->rotation + $angle;
+        my $new_angle = $model_instance->rotation + deg2rad($angle);
         $_->set_rotation($new_angle) for @{ $model_object->instances };
         $object->transform_thumbnail($self->{model}, $obj_idx);
     } else {
         # rotation around X and Y needs to be performed on mesh
         # so we first apply any Z rotation
         if ($model_instance->rotation != 0) {
-            $model_object->rotate(deg2rad($model_instance->rotation), Z);
+            $model_object->rotate($model_instance->rotation, Z);
             $_->set_rotation(0) for @{ $model_object->instances };
         }
         $model_object->rotate(deg2rad($angle), $axis);
@@ -741,7 +741,7 @@ sub flip {
     
     # apply Z rotation before flipping
     if ($model_instance->rotation != 0) {
-        $model_object->rotate(deg2rad($model_instance->rotation), Z);
+        $model_object->rotate($model_instance->rotation, Z);
         $_->set_rotation(0) for @{ $model_object->instances };
     }
     
@@ -780,7 +780,7 @@ sub changescale {
         
         # apply Z rotation before scaling
         if ($model_instance->rotation != 0) {
-            $model_object->rotate(deg2rad($model_instance->rotation), Z);
+            $model_object->rotate($model_instance->rotation, Z);
             $_->set_rotation(0) for @{ $model_object->instances };
         }
         
@@ -1730,7 +1730,7 @@ sub transform_thumbnail {
     # the order of these transformations MUST be the same everywhere, including
     # in Slic3r::Print->add_model_object()
     my $t = $self->thumbnail->clone;
-    $t->rotate(deg2rad($model_instance->rotation), Slic3r::Point->new(0,0));
+    $t->rotate($model_instance->rotation, Slic3r::Point->new(0,0));
     $t->scale($model_instance->scaling_factor);
     
     $self->transformed_thumbnail($t);
diff --git a/xs/src/libslic3r/Model.cpp b/xs/src/libslic3r/Model.cpp
index fc9f39b3f..8d98b4d6b 100644
--- a/xs/src/libslic3r/Model.cpp
+++ b/xs/src/libslic3r/Model.cpp
@@ -485,7 +485,7 @@ ModelObject::center_around_origin()
             // apply rotation and scaling to vector as well before translating instance,
             // in order to leave final position unaltered
             Vectorf3 v = vector.negative();
-            v.rotate(Slic3r::Geometry::deg2rad((*i)->rotation), (*i)->offset);
+            v.rotate((*i)->rotation, (*i)->offset);
             v.scale((*i)->scaling_factor);
             (*i)->offset.translate(v.x, v.y);
         }
@@ -523,9 +523,6 @@ ModelObject::scale(const Pointf3 &versor)
 void
 ModelObject::rotate(float angle, const Axis &axis)
 {
-    // we accept angle in radians but mesh currently uses degrees
-    angle = Slic3r::Geometry::rad2deg(angle);
-    
     for (ModelVolumePtrs::const_iterator v = this->volumes.begin(); v != this->volumes.end(); ++v) {
         (*v)->mesh.rotate(angle, axis);
     }
diff --git a/xs/src/libslic3r/Model.hpp b/xs/src/libslic3r/Model.hpp
index edce23d9c..e5683cb57 100644
--- a/xs/src/libslic3r/Model.hpp
+++ b/xs/src/libslic3r/Model.hpp
@@ -177,7 +177,7 @@ class ModelInstance
 {
     friend class ModelObject;
     public:
-    double rotation;            // around mesh center point
+    double rotation;            // in radians around mesh center point
     double scaling_factor;
     Pointf offset;              // in unscaled coordinates
     
diff --git a/xs/src/libslic3r/TriangleMesh.cpp b/xs/src/libslic3r/TriangleMesh.cpp
index e8c8ef781..822d6ffb3 100644
--- a/xs/src/libslic3r/TriangleMesh.cpp
+++ b/xs/src/libslic3r/TriangleMesh.cpp
@@ -202,6 +202,9 @@ void TriangleMesh::translate(float x, float y, float z)
 
 void TriangleMesh::rotate(float angle, const Axis &axis)
 {
+    // admesh uses degrees
+    angle = Slic3r::Geometry::rad2deg(angle);
+    
     if (axis == X) {
         stl_rotate_x(&(this->stl), angle);
     } else if (axis == Y) {