Remix of https://www.thingiverse.com/thing:1062017 to remove the big support rail and to add a disc to the center-back of the platform she sits on. It makes for a good spot to glue a flat magnet.

I placed this inside my NZXT H510 case right in front of the white cable management bar and it fit pretty nicely. She hangs down from above my cables and looks out of my case.

Were I to print this again, I would use less supports than I did (50 degrees ended up with TONS of support to cut away, omg, bad move) You'll want to be very careful with your support choices because there are a lot of hanging bits and overhangs that will want to stick to them.

BUT I'm happy with my result anyway, so if you want an easy case-mountable GLaDOS, there you go!