I’m making a very large object which involves cutting large parts out of 1/2" plywood. By the time I’m done, we’re talking about 40 sheets.
Needless to say, plywood has a tendency to warp and buckle, especially as you cut through it. Strategically-placed holding tabs are critical, but they don’t address the problem that the surrounding material will buckle and warp during the cut.
You can and should screw the plywood down into your spoilboard, but the question is where? You want to add hold-down screws near your cuts, but not at the risk of hitting them during the cut.
Add shallow 2mm drill marks to your GC program that indicate where it’s safe to put a screw. Works great! Make sure to put them a few inches outside the cut line, so when the MDF won’t hold a screw in that spot anymore, you can just move over a little.
ESTL has intersection and center of circle features available with the Drill function which make this quite easy. Worth a few minutes to figure out how those work.
After you’ve done this, the first thing your cut will do is go around the sheet and indicate where you should put screws. Totally worth the effort.