Card Holder
thingiverse
This card holder holds nine various size cards, and it's a simple design that gets the job done. If your cards are thicker than usual, you might not be able to fit nine of them in there. One of the cards I always carry is an RFID blocker like this one: https://www.amazon.com/D-Armor-Wallet-Blocking-Protector-2-cards/dp/B00CJHZLEW I print mine with supports standing up, but be careful when removing those supports from the back so you don't damage the top part of the money clip. The opening on the bottom helps you push cards out easily. I've been using a black one daily in my front pocket for three months now, and it's held up great.
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