John Trant
Apr 12,2023From my experience trying to do this with a lower power diode laser it was basically impossible as you found. As far as I’m aware all dollar tree foam board has white foam. I suspect between the color and structure of the foam basically all light is either reflected or otherwise dissipated. Even if you could work your way slowly through it I suspect it would leave an ugly mess. A CO2 laser cuts through without fuss.