Needed a smallish case to carry games in for business trips, quickly designed this box. The slots for the games are slightly tapered so the further down you push the game the tighter the squeeze. This lets you decide how hard the box needs to hold onto the games.
My printers tolerances are spot on with PETG, 3.8mm in the design prints exactly 3.8mm. You may need to slightly scale this up depending on your machine and plastic of choice.
I've added a few random logos around the sides of the box to add some flair.