I have been using the original folding wallet by Amplivibe https://www.thingiverse.com/thing:123670 for some time now and it works well. Much better than my old fat leather wallet.
But I did find that the notes would fall out when opening to get cards out, so I decided to add a clip and remove the holes in the side walls.
Rather than draw a hole new clip the Money Clip by pmagda was a good one https://www.thingiverse.com/thing:325983 so I combined the two to give me what I needed :)
The filament is PLA Extrafill "Vertigo Galaxy" by Fillamentum a great filament with a nice sparkle.
Please post a make if you print one, it's always good to see one someone else has made.