Challenge Coin Keychain Holder
thingiverse
Designed to hold a 39mm - 42mm challenge coin and attach to your keys. Pins are to align the two halves only - they are not meant to hold the halves together! I use Gorilla Super Glue Gel to hold the two halves together. I just print the words I want and glue them to the top of the holder with glue. The shim is to hold a smaller coin in place (39mm to 40mm). I am sure you can scale this up or down for other sized coins.
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