Clock for kids - they can turn minute hand and the hour hand turns as well exactly as on real clock. Children can learn the planetary gear as well :-)

Print instructions

Print all the files except clock_donotprint.stl (this is for reference of complete clock only). planetgear.stl is required twice. I printed it from PETG using 0,2mm layer and 0,4mm nozzle, but the print is easy - no supports are required. The dial is printed "face down".
Assemble the gearbox first (image), then put on the dial and finally click the hands (no glue is neccesary).
You can make paper "cover" on dial depending on your children skills (e.g. 12/24 hours format, minute numbers).