64:1 Gearbox v.2.0

This 64:1 gearbox is inspired by the Tamiya gearboxes, which are nearly all-plastic construction but work great all the same. This hasn't been printed out before.

For use with the Mabuchi DC motors:
http://www.allelectronics.com/make-a-store/item/DCM-296/SMALL-DC-MOTOR-MABUCHI/1.html

There is a 3D model of this motor in the .blend file.

Edit! I'm getting reports of gears not meshing at this size from the MakerBot team, and scaling up this design 'till they do puts the frame outside th