About this 3D model

This is a derivative of http://www.thingiverse.com/thing:4458. When I built the shorty version I had trouble getting the parts to print correctly and I wanted the ring to turn further to fully open the box. When I designed this iris box I started from scratch and used a different mechanism to open the box. I have also uploaded the NX6 .prt files for anybody who wishes to use them.