This is a Playing Card Holder with an angled draw slot and a discard slot. The "Half" file will fit most standard printers and cover you for a large number of cards. The "Full" design is very large and will only print on large machines, but it will work better if you have different kinds of cards in your game.
I made these for Apples to Apples because of the absurd number of cards used in that game, but the slots are sized for normal playing cards. Normal cards will fit perfectly on the diagonal with a couple mm of clearance on the sides.
No support needed. The print is long. PLEASE remix this to reduce material use and suit your wishes. I've included STEP files.