So I've used leather wallets all my life and they always worn out very bad at the edges, sometimes even the plastic cover peels off and in general they get destroyed.
Then I saw those hard covers on tv, but they are expensive and also have a fixed amount of cards that can be used at a time. After that I started using 3D printed wallets that can be printed on need. That was a very good Idea, so good that I created my own and here it is.
This little one its just one piece that can be printed several times and stacked to allow even more cards to be stored.
All this might look like a big commercial, but I actually published it under Creative Commons - Public Domain Dedication for general use/remix/destroy/love, free as in "free beer".
Here is a photo of one printed holding my cards and cash:
EDIT:
Thanks to @cryptos who pointed me the usability, here is also a video of the wallet in action taking out cash and cards:
You can download the .stl file from thingiverse.
Share and upvote if you want more things or stuff :D
Hope you like it :D