Have you looked into the CAD design process for your own clockwork mechanisms? Drawing your own involute gear teeth is complicated, but feasible. I was over-ambutuous in my drafting final, but I made a system of gears and levers to lift marbles up a series of stepped pistons and 3D printed a prototype. The tolerances for moving parts and printer a accuracy can cause problems, but when it works right, it's awesome technology.
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Clockwork mechanisms? That's a lot of gears. I will probably start with simpler ones like toy cars. 😊
There are some complicated models on Thingiverse for automatic transmissions, gear-driven clocks, and more.