it prints off at square but its really easy to cut out with scissors as i done,

ive also put a link to the clock mechanism off amazon

https://amzn.eu/d/6LuZrH6

Print at 100% infill with a layer height of 0.08mm with a base layer of 0.16mm

Filaments Used:
Black Transmission Distance: 0.3
White Transmission Distance: 6

Swap Instructions:
Start with Black
At layer #3 (0.32mm) swap to White for the rest.