About this 3D model

I am using this presently to couple my Nema 17 motors to M5 threaded rod. In my experience these are more reliable then the flexbile i3 couplings. Customized version of http://www.thingiverse.com/thing:15633 Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=15633