snap fastener sew on - Druckknopf zum festnähen 18mm

thingiverse

I would recommend to print them in PETG but PLA works as well. I took a while to get the dimensions just right for a nice fit. If the tolerances of your printer are different, it might be too tight or too loose. In that case, you could print one part slightly larger than the other. Part A2 should be slightly more loose.