After lockdown, I started carrying just a single card, but as the world opened back up again, I needed to carry a few more so started just holding them together with a rubber band. A very economical solution as the postman left a new one every so often.
This a a 3D printed version of that minimalist approach - the absolute Minimum Viable Wallet for cards, cash or train tickets.
Prints and works well with plain PLA but after printing, allow to fully cool to retain the ‘spring’. The default is just two walls but vase mode may work with an extremely stiff filament (eg carbon fibre).
The author marked this model as their own original creation.