@Bruce_Meacham Welcome to our group. I’m a little late joining in. I think seeing the results of routing here, you will be better off with that or a hot knife/ drag knife type of device. I have lasered foam and it is very inconsistent , the out gassing is toxic. You can’t control the amount of melt/shrinking around the kerf of the laser. Also if it catches fire it will burn up quickly. If you do decide to use a laser you will need a active filtering system. Be safe.
Sanding and carving of foam is it’s strength.
Thank you