A replacement rivet for the Efko Chytrý provázek game. Tested on “Roční období”, not sure if other versions have the same hole diameter and thickness.

Printed using PLA, 0.4 nozzle, 0.2 layer height, using the structural profile on MK4. I was able to just push both parts together and they got joined perfectly. You mileage may vary, though. :) If the parts didn't snap well for you, you may need to change the diameter (I included the source freecad file), or use superglue.