This is the best 3D printable wallet I've found. The only flaw is that there really isn't space for dollar bills. The original design has a middle section for money but the pressure of the money interferes with the rotating lid. Instead I put the slim Tile (https://www.thetileapp.com/en-us/store/tiles/slim) into the money section.
I created this remix to accept a thin metal money clip which is a lot stronger than trying to 3D print a clip to hold money.
There are two versions of this base: wallet_m3_bottom_with_money_clip_slot_20mm 2.47 by 0.79 inches (60mm x 20mm) Money clip https://www.amazon.com/gp/product/B078YQMZXT wallet_m3_bottom_with_money_clip_slot_40mm 2.75" X 1.5 inches (71mm x 39mm) Money clip https://www.amazon.com/Travelambo-Carbon-Pocket-Minimalist-Business/dp/B01N35XJXP
Remixed From https://www.prusaprinters.org/prints/66414-wallet-m3-my-daily-wallet