"Choose your side!"

Transformers Autobot Extruder Gear (small drive gear not included)  

This is based on the original STL file for the herringbone pattern gears used in the Printrbot's extruder, designed by Brook Drumm (gears from Wade's Most Excellent Extruder). Laser-sintered nylon is a very precise way to make objects, why not your extruder gears?

The Autobot emblem snaps into place to cover the head of the hobbed bolt. May require slight sanding to fit.

See the picture with the black and the white gears:
The Black gear came with my Printrbot Plus kit. The STL file shows a diameter of 63.78 mm. The gear that was printed by a Printrbot in my kit measures 61.25 (averaged 8 measurements) The white gear was printed by Shapeways in Laser-sintered nylon and averages 63.25 mm  

If you want a little Headhunter - Gothic - Cannibal - Biker vibe on your 3D Printer, check out the Skulltruder!