I was asked to design a storage solution for a few hundred SD cards used for recording music and critiques at our college jazz festival.
This tray holds 25 SD cards and has a cover that slides in from the back and snaps into place to prevent the cards from falling out. The slots are keyed so that the cards only slide in all the way if the labels are facing the forward. The lid will not close if the cards are backward.
UPDATE: Added a 100 SD case of the same basic design.
I chose these settings because I wanted a dense, clean print and didn't mind the extra print time. Choose what works best for you.