Push-Pin Refrigerator Magnet

I wanted to use some NdFeB magnets to hold things on my refrigerator, but I also wanted to be able to grip them for removal (and putting them on without slamming the magnets). I found some 1/2" diameter by 1/4" thick axially polarized disc magnets with a hole countersunk for a #6 machine screw. I ordered the magnets and purchased some stainless steel flathead machine screws and nuts. Please see **Materials** and **Methods** for details.

I designed this grip (or handle, I am not quite sure what to call it) to resemble a push-pin, as well as to work with the aforementioned hardware. I wanted positive retention of the screw, so I decided to embed the nut in the grip.

There is 1/16" of material below the hex nut to ensure sufficient strength during use. The geometry of the inset for the hex nut has very tight tolerances, particularly regarding the height of the hex nut. These tolerances are due to wanting the first layer above the hex nut to print onto it. There is a relief above the hex