Customized version of https://www.thingiverse.com/thing:1516585

Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=1516585

Using the following options:

n_teeth = 72
d_gear = 29.2
d_hole = 4
h_gear = 2
w_teeth = 1.5
l_teeth = 3