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I created this because I couldn't find a card holder that was most convenient for me and didn't require screws. I hope other people can find this useful. I think it fits most cards, mine is about 85x53mm. I printed mine in PETG, but the gcode is for PLA. I used grid supports underneath the tabs in the middle. Total print time was about an hour fifteen, but your mileage will vary.

Comes in 1x, 2x, and 4x sizes. 2x allows for one card behind the other, 4x is the same but on the back too. 4x has been less successful for me because of the large overhang, you could try printing vertically.

I have added a step file if the dimensions are not the same for you, or if you want to customize something else.