Wheel - Modio/Thingmaker

I got hooked on the Thingmaker app and made a Raptor. I really liked the designs and searched through all the ones listed here when I found the wheel.

My design was inspired by Marakew's wheel: http://www.thingiverse.com/thing:491232

I knew the design was faulty, but it got me thinking about how to make a functional wheel for the Modio/Thingmaker parts. It is essentially it's own bearing, with two parts printed together. I added tiny supports across the center piece to the exterior to