sun gear model from Thing-O-Fun (2012) Exploded Planetary Gear Set publishing Thingiverse web. http://www.thingiverse.com/thing:18291
gear model from
Jetty (2012) Paper Crimper publishing Thingiverse web. http://www.thingiverse.com/thing:17634
t55gear model from Droftarts (2012) Parametric pulley-lots of tooth profiles publishing Thigiverse web. http://www.thingiverse.com/thing:16627