Print out the parts and build a functionable but simple pendulum clock that is realy useable (runs 14h and easy to wind up). You need:2mm steel axes (55mm, 48mm, 48mm and 10mm), a pipe (4mm outside diameter, 12mm length). It can be a profile from a hardware-store or a stalk from a lollipop. a tooth belt (4 meter long, 4mm thick, 2mm teeth, typical for 3D-Printers). If you get only 10mm tooth-belt, then split it with my tooth-belt-splitter 3D model. One kg weight (https://www.enerfit.de/scheiben-weights-eisen-25-kg-25-mm.html?utm_source=shopping_free&utm_medium=organic&utm_content=HP1002-1&gclid=Cj0KCQjw27mhBhC9ARIsAIFsETGgsT0P1d0zog59omWPCUeRS4kqJJZUORybaZKeWP5r2Hg7eAc76NAaAjjVEALw_wcB)If you use 1,25 kg weight, glue a large washer on the pendulum to make it more heavy.

How to build it is shown in the video. All wheels have to run friction-free, so you might need to clean the centerhole with a drilling machine and a 2mm drill, if it is not clean enough printed. The clock is build to hang gently foreward, so the wheels slip more to the front. This leads to less pressure to the fast runnig backside wheels. The gears are chamfered. Otherwise the site on the printbed would get thicker. Use printing glue. It is a nice project with kids. The gears lead to understand mathematical relations.