This business card holder takes approximately 10 cards (85x55mm).
The design of the front of the holder has been borrowed from https://www.thingiverse.com/thing:2068269 to get a nice aesthetic.
The functionality is simple - a slight slope allows you to slide business cards out of the holder without any additional mechanics necessary. The narrow slot prevents the cards from falling out.
This holder matches my card case that is more than twice as deep and takes a good stack of cards.
Business_Card_Holder.stl | 154.7KB |