Key Impressioning Mould

thingiverse

You'll first need to smooth out the rough edges I highlighted with blue in one of the pictures. Once that's done, you can put everything together and insert a rod - I opted for a 2mm thick steel rod. The holes on the model are designed to accommodate a rod of about 2.8mm in diameter; I had considered using a nail I already had on hand, but my printer managed to mess it up slightly. To assemble the parts properly, you'll need to rotate one piece by exactly 90 degrees because that's how I set it up in Fusion360.