Customized version of https://www.thingiverse.com/thing:3059422

Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=3059422

Using the following options:

roller_d = 22.23
thickness = 24.5
pitch = 38.1
tolerance = 0.05
teeth = 12
bottom_shaft_d = 10
bottom_shaft_h = 2
top_shaft_d = 40
top_shaft_h = 12.7
toptop_shaft_d = 16
toptop_shaft_h = 8
hole_d = 20
number_of_holes = 0
hole_dia = 4
hole_ring_dia = 40
fs = 0.25
fa = 1
fn = 0