Simple one-piece: https://www.printables.com/model/33600-credit-card-wallet
Storage for SIM/MicroSD cards: https://www.printables.com/model/246538-minimalistic-card-wallet
Enclosed two-piece: https://www.printables.com/model/244836-parametric-snap-together-credit-card-wallet-v3
Key hub: https://www.printables.com/model/1486968-card-wallet-with-money-clip-and-key-hub
Concealed keys: https://www.thingiverse.com/thing:3230667
Hinged: https://www.thingiverse.com/thing:2819571
Spare key tray only: https://www.thingiverse.com/thing:2992263
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500 Server Error: Fiat edition
Their 404 is great too.
https://mailfence.com/support/automatic.jsp