Spur and Gear for Vaterra Ascender

This is a derivative of http://www.thingiverse.com/thing:3575.

I made this to explore different ratios for my Vaterra Ascender.

With Openscad, it's pretty simply to create whatever spur-gear combinations you want.

Instructions :

1. measure distance between the centers of the spur and the pinion you have now

2. set DISTANCE_BETWEEN_CENTERS_ACCORDINGLY

3. set TEETH_1 and TEETH_2 as you wish

4. modify CIRCULAR_PITCH_DEF until gears mesh correctly; you might want to modify SPU