Customized version of http://www.thingiverse.com/thing:454702

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=454702

Using the following options:

number_of_planets = 5
w = 10
P = 45
T = 25
D = 57.277
tol = 0.15
number_of_teeth_on_planets = 7
approximate_number_of_teeth_on_sun = 9
allowed_overhang = 0.75
tubing_wall_thickness = 1.9
tubing_od = 7.9248
tubing_squish_ratio = 0.3
nTwist = 1