I had an old SNES game that didn't work any more, but I didn't want to throw it away. I stumbled upon a cool use for it - an external hard drive enclosure!
I've seen people put hard disks and larger SSDs into SNES cartridges, but not a M.2 (2280) SSD which I also had laying around, so I thought I'd give it a try and share my process.
One thing I tried hard to achieve was to make the cartridge appear stock, unless you look at the bottom of it. I didn't want to have any cutouts or openings on the sides, which would make it look like less of a clean build.