This wallet was designed to be printed out of flexible filament. It holds up to five cards and has a slot on the back for cash. The slot holding the cards is tapered so the cards will not fall out. Also, the slot for cash is curved on one side to prevent the cash from falling out and it will flex outward as more bills are added.This wallet was printed at a layer height of 0.2 mm, 2 perimeters, and 0.3 infill with sapphire NinjaFlex. Support material not necessary.