Summary Since my other watch is a little big, I've constructed this baby-watch as a keychain. So I can have it with me every day :-). The baby can't walk, but it has some gears and a spring for playing. Who knows, maybe it learns walking some day? Printing and assembly is easy. There are no Screws or pins. Print Settings Printer Brand: Ultimaker Printer: Ultimaker 2 Rafts: No Supports: No Resolution: high Infill: 30% Notes: Used Simplify3D for slicing. Works great. Post-Printing The only "tricky" assembly step is the Mainspring: it tightly fits into the bottom of the case. The little ratchet-pawl needs to face downwards. Slide the spring with one end beneath the axle of the small gear, and push the other end of the spring into the case (needs some force). The rest is like a simple puzzle (the STL pieces in gallery are sorted in the correct assembly sequence) ... have fun!