Magnetic belt key holder

This was designed so I could carry my keys at work securely on my belt, without them falling off even when moving around tight spaces, but still allow using the keys with one hand while carrying heavy objects in the other.

I additionally use a stretchy coil lanyard/tether so that my keys can't be dropped and/or lost, but that isn't part of the model. I've used mine for over 6 months and it's held up very well.

It requires 2x 10mm*2mm neodymium disc magnets, which should be superglued in after printing and removing supports. I keep a bunch of them around for various purposes.

I print in PETG at 100% infill, 0.2mm layer height, with manual supports only inside the loop of the key holder to keep it as strong as possible. You may want to slightly chamfer the top V edges on the key holder part depending on the tolerances from your printer and your preferred fitment.