With no wallet app or NFC payments, I’m now forced to carry my card around with me.
I’m sure other people who are using the Mudita as their daily driver are having to do this too, so why not make a phone case that we’re able to slot our cards into?
I did try placing my card inside of the case but it’s not a great fit.
If anyone 3d models a case I can 3d print them and mail them to people in the US at a low cost 
There are tons of companies that make card holders that you can stick onto the back of any phone or existing phone case. They’re pretty cheap (I often see them being given away by companies as free swag at events) and you can find ones that are designed to hold a single card or ones that hold multiple cards. That’s probably a better option than making a new case based around holding your cards (especially since not everyone will have the same number of cards they need to carry).