Bugfix: objects were floating in STL export after rotation and flip. #2512

xs/src/libslic3r/Model.cpp

@@ -520,6 +520,9 @@ ModelObject::scale(const Pointf3 &versor)
     for (ModelVolumePtrs::const_iterator v = this->volumes.begin(); v != this->volumes.end(); ++v) {
         (*v)->mesh.scale(versor);
     }
+    
+    // reset origin translation since it doesn't make sense anymore
+    this->origin_translation = Pointf3(0,0,0);
     this->invalidate_bounding_box();
 }
 

xs/src/libslic3r/Model.hpp

@@ -97,7 +97,7 @@ class ModelObject
     
     /* This vector accumulates the total translation applied to the object by the
         center_around_origin() method. Callers might want to apply the same translation
-        to new volumes before adding them to this object in order to preset alignment
+        to new volumes before adding them to this object in order to preserve alignment
         when user expects that. */
     Pointf3 origin_translation;