So glad I found this site. My intent is to build an XY laser cutter, for Balsa and hobby ply's. While many questions are arising I have a couple that need addressing to get started. First off, I am divided on using belt or ball screw linear way provided by this site. Both are nice, compact and efficient solutions. Second, how much laser is needed to cut : Balsa wood - 1/8" hobby ply - 1/4" hobby ply - Was hoping that a Blue laser ~ 4-6 watts would be sufficient to handle this work, from an economical standpoint. Surely some are already doing what my intentions are and have some advise from experience.