Hi! Here's a quick version of a business card case for 90x51mm cards. It holds about 15 cards depending how thick they are. Haven't been able to print it yet, so no sure will the lid stay properly in place. If you wan't to give it a try, please let me know how it works :) I'll make adjustments if requested (magnet sockets etc) Join the parts with 2 - 2.2mm rod (rc pull/push rod or similar) EDIT: Added version 2.0 drawings, rounded edges and modified mechanism to keep the lid closed.. EDIT: Added version 2.1 drawings, more rounded edges and made the lid a bit sturdier