I printed this on its long flat side with no supports on my Mini+. PLA is fine as when the card is in it the card will prevent breakage. I also added a small hole in the bottom to poke something through for easier removal as my tolerances are snug.
The author remixed this model.
So I used very similar spacing to the original model by using calipers. The original design was too big for our cards at work so I took the original model and started from scratch in fusion to create one that fit my card.