Clock

Print the front and back, and align and stick them together. A mounting peg works with a command strip to stick to a wall.

Total diameter is 170 mm. Works best with a clock mechanism with an 8 mm shaft diameter (5/16 in), 8 mm shaft length (5/16 in).

I used www.amazon.com/gp/product/B07T7HHJR2 for mine. The hands of the mechanism typically need to be cut to fit.

No supports needed, front took 6 hours, back + hook took 3.5 hours