About this 3D model

Attempt to make a retroadapter for Samsung NX lense with 40.5mm filter thread.The filter thread pitch is 0.5mm, ie horizontal resolution has to be very fine. (Have not tested if 0.1mm layer hight would be enough to produce the thread).About retroadapter: http://www.traumflieger.de/desktop/retroadapter/retroadapter.php Edit. Corrected the thread, but not printed it yet.