Triangle Tank

Another little tracked robot, inspired by Ktronics (https://www.thingiverse.com/thing:14599) and Geir (https://www.thingiverse.com/thing:8740).

You'll need to print 6 of the wheels, 2 of the sprockets and 2 of the sideplates for the basic assembly, plus 2 of the battery mounts and one of the arduino/9110 holders if you choose to use them. Purchased items are the motors (about $3), belts ($8), threaded rods and nuts ($5), bearings($2), and the battery ($20) and electronics($4).

Some of my early versions of this tank had issues with the belts running off the wheels and jamming the motors, but the little flanges on the wheels and sprockets seem to have fixed that. You could put another pair of plates on the outside of the wheels, like is shown in the "one_side_assembly" .stl file, but my current version works OK with just the inboard plates as shown in the photo

BILL OF MATERIALS:

This thing uses 2 of these cheap little geared motors (http://www.ebay.com/itm/Smart-Car-Robo