I was walking back to my computer (which is in a different room) after setting up my material in the Glowforge when I heard a loud snap coming from that area. I rushed back into the room and closely inspected everything but couldn’t find a problem.
This was actually the second time this has happened, with the same result (last time was a few weeks ago). Now I’m really start to worry so I gave everything a really good look over, and finally located the problem.
I had taken the five large magnets out of the machine as I was using holddown pins for this project, and I had distributed them evenly on top of the left side of the GF, pretty far from each other (I thought). Close inspection revealed two of them snapped together, still clad in their duct tape jackets.