Kill Switch Tether
thingiverse
This is the magnet holder for a motorcycle kill switch. I lost mine at a competition and had to borrow a friend's for the day. There are 2 designs. One you can print and super glue a magnet in. The other you'll need to pause the print at about 9mm (depending on your layer height), drop the magnet in, and continue printing. Might be a good idea to add a drop of super glue first. I didn't have an issue, but the magnet could jump to your print nozzle/head if you don't. The magnets I used are 8mm in diameter and 3mm thick. I printed mine in both ABS and TPU. I'd think almost any material would be fine.
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