> If yes, then why not use an ink-jet print head Hi Sergey I'd definitely thought of using a printhead. And daydreamed about it long and hard last week when I was stripping down scrap printers It's not out of the question. Each method has its pros and cons For example red laser marks darker materials best (probably a frequency match between red light and brown wood), printer marks light materials best (pine, balsa, tawa etc), unless you use a colour cartridge and switch from blue to yellow It would be fairly easy to mechanically convert a desktop printer to feed wood instead of paper. Scaling that to A0 might be tricky, but still doable Maybe a bit more daydreaming will help Joe --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .