You can buy very strong “cup magnets” that have steel “cups” over the sides and down. I had some before I discovered the problem and only use those now. I tried steel “flashing” and it helps but is not good enough.
The problem is not specifically the laser but anything electrical or electronic moving very rapidly in a very strong magnetic field. If all that is six or seven inches above the magnet and the field does not reach that high then the magnet has no effect, but in a Glowforge there is a lot not two inches above the bed and thus the problem.
That’s what I ended up doing, but it required me to cut the board width down so that I had space on the sides for more pins (it was really warped) , which then made me have to redo the design which was maximized to use every square inch of space. Plus, as the warped board began having pieces cut out of the center, they would pop up and almost hit the head of the laser (because they were warped and under pressure). needless to say, I miss being able to fit magnets in between parts in the middle.
and it could only be done in steps while wet but dry it would stay nicely. Also when cutting regular wood the cleaning of the piece would get it very wet and it would warp a lot but folded in a towel and clamped between a couple pieces of tile and wait for the towel to wick out the dampness and the warp is gone. If you just clamp the dry wood the warp will pop back as soon as the clamps are removed.
Oh yes tungsten is very popular these days. A real fad. We used to purchase tungsten rod alloy to balance crankshafts. A couple inches of those weights in a 5 gallon bucket would be all you can lift.
