This is the simplest card holder I can imagine for credit cards, bank cards, or other suitable cards.

This is something I made myself. There's no decoration. It should be printed as straight as possible, with the opening facing upwards.

We used transparent PETG. Have a great time using it!

It was printed using a 0.4 nozzle and a layer height of 0.2. I'm sure I could do a better job.