Laser, who needs a laser! Just use the sun!
Ok, you want to do some engraving on wood, plastic, or on your hand? (no, not really) don’t feel like buying one of those expensive wood engraver irons? Want a foolproof way to make nice engravings without worrying about your hand slipping and botching the whole job?
THIS IS FOR YOU! If you like simple, useful, and easy processes, give this a try. this just takes a few simple steps, and is very easy to do. You need NO experience with tools. If you can stick something with tape, and use a knife, you’re set. If you can’t… well, there’s not much I can say about it, but that now is a good time to learn!
instructables : Make your own simple sunlight engraver! – Link.