There is a design on Thingverse of a thwomp cartridge holder that is probably the best game storage contraption I’ve ever seen. It can be printed with a 3D printer and can hold up to 18 games. The pattern and finished product that I really enjoyed was uploaded by gee1973.

This would be a really cool addition to any gamers collection because we’re always looking for a fun place to store our cartridges. The ones they sell in store just don’t hold enough. Plus this would look really neat on the shelf next to some of our Mario Amiibos.
You can check out the files to print one yourself by clicking the link here.