This is a basic key shaped holder for the standard size Featherweight magnet. It is used with the mag switch included in some of their designs, or in the seperate mag switch itself. It is sized for the magnet to fit firmly inside the key, with leaving ¼" of the magnet exposed. You can add it to your key ring, or your event lanyard, etc.

I printed this model with PETG, standing upright, with a 0.15 layer height and a 0.4 nozzle. I used a tree support for the top loop, but you probably won't need it. 

Depending on your print settings, a drop of CA, Epoxy, or RTV can be used if you find the fit is too loose.