So that I don't have to carry a separate set of keys, I made this practical badge holder for my Lockcard wallet.

With this holder, you can open the door without removing the badge. 
All you have to do is hold the entire wallet up to the lock.

The model does not require any support and can be printed with minimal material and time.

If you have a different badge, you can customize the model on Onshape to suit your needs.
https://cad.onshape.com/documents/04674bd4c1edfa411973794f/w/300762253d4e51ea6024466a/e/028ec13696e67b9db5be4328?renderMode=0&uiState=68c68c771478f4facb3a9b63

Have fun with your new batch holder!