I had a surplus of 3/4" diameter 1/8" thick disc neodymium magnets with a countersunk hole in the middle.
So to use them as hold down magnets in the Glowforge I put orange duct tape on one side and black duct tape on the other. It made a handle to pick them up form the GF grid and the colors let me know what the magnetic polarity was.
As you can see the duct tape started to tear. I also found myself placing the magnets on the grid with just the edge on the material. The magnet wasn’t strong enough to hold down thicker material or if it was on top of the material it got in the way of the laser. So I thought I should make a plastic enclosure to allow the magnet to be next to the material and hold it down.
–This is where this turns into a 3D printing post–
I designed these 3 parts in Fusion 360
The peg and disc get glued together to encompass the magnet.
The disc has a protrusion that will fit into a chamfer on the ring and it gets glued together.
Here you can see the lip that holds down the material and that the back of the magnet is exposed. It allows the magnet to tilt up and hold down thicker material.
I think the next step is to design the clip to hold 2 magnets (for more power) and have the lip be higher to hold thicker material.
Here are the stl files to print your own clips.
MagClip.zip (55.8 KB)
These are the magnets I used.