Maybe with 4 of your devices combined, you could do some engraving using a mask.
I would like to see the beam hit a fluorescent material. There should be some glow before it burns up.
I'm impressed, that's less than I had assumed. Does it need external lenses that you hold with your hand to focus the beam, or does it also have a focussing lens like "normal" lasers? And what kind of lens did you use when you cut that metal wire? It appears to bend the beam into a cone that curves inwards, which is something I had never seen.Thanks for the tip! I spent about $ 900