Customized version of http://www.thingiverse.com/thing:59075

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=59075

Using the following options:

number_of_planets = 4
delta = -1
vtol = 0.25
number_of_teeth_on_planets = 14
nTwist = 1
export = 0
w = 3
P = 30
T = 7
D = 35
tol = 0.25
approximate_number_of_teeth_on_sun = 12