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

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

Using the following options:

tol = 0.15
allowed_overhang = 0.75
tubing_od = 10
tubing_wall_thickness = 1
tubing_squish_ratio = 0.45
D = 60
T = 25
number_of_planets = 3
number_of_teeth_on_planets = 7
approximate_number_of_teeth_on_sun = 9
P = 45
nTwist = 1
w = 6.7