About this 3D model

Sprocket for 5mm stepper motor shaft (with flat) for use with a 3.5mm ball chain. Intended for use with a polargraph http://www.polargraph.co.uk This design wont slip when its contacting as little as 90 degrees of the sprocket, or as few as five links in the chain. Derived from both: http://www.thingiverse.com/thing:28811 http://www.thingiverse.com/thing:12403 Thanks for the inspiration.