Well, there are no laser diodes that will cut 1/4 ply single pass. And be leery of any laser diodes advertised to be over 7 watts. For cutting 1/4 ply single pass, you will have to go with a CO2 machine (probably around 100 watts or better), but that brings up another problem. To have a CO2 with a 3 ft sq working range while also capable of cutting 1/4 ply, I suspect you are looking at a cost of thousands. I hope I do not sound too negative.