I wanted something that would allow me to quickly detach my car keys from my apartment keys.

This print needs 4 pcs. 6x3mm neodymium magnets, the ones I had measured in at 2.7mm in diameter so make sure to measure yours before printing. The .f3d file is also attached so feel free to modify it in case your magnets will not fit. I used a drop of superglue to secure the magnets, I strongly suggest you do the same