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:

tubing_squish_ratio = .33
tubing_od = 9
allowed_overhang = 0.5
tol = 0.2
number_of_teeth_on_planets = 7
tubing_wall_thickness = 1.4
number_of_planets = 4
nTwist = 1
w = 6.2
P = 45
T = 25
D = 60
approximate_number_of_teeth_on_sun = 9