Summary

This thing was made with Tinkercad. Edit it online https://tinkercad.com/things/1KcdsJKlr1C. Its a work in progress and uses http://www.thingiverse.com/thing:3981

Instructions

Work in progress. Not sure the teeth mesh quite right yet. I know 2'of the teeth are a bit small. I'm still tweaking it. I know Openscad would generate a perfect one but I'm not really a programming guy so I'm going with throw GUI for now. If anyone has a gear script they want to share for the tinkercad Java scripter I'd definitely be interested seeing how it works.

Update: I modified it to have 18 teeth. I think they are all the same size now and should mesh better. I'm going to try printing it tonight.

Bearing Gears