This is a printable plastic wheel for use with the Solarbotics GM-series (i.e. GM2, GM8, etc.; see solarbotics.com/products/gm8/) motors and compatible with the Solarbotics RW2 ( solarbotics.com/products/rw2_t/ ) tires.

I needed a wheel that would fit on the double-flat output of the GM-series motors and also work with the tires of the RW2 wheels for a Sumobot. I designed these in OpenSCAD for printing on a MakerBot.