I have a 30 Watt diode laser that came without any safety measures at all. It kind of surprised me that you could just fire it with a G-code and absolutely nothing stood between you and the beam. It cuts wood like butter though, up to 20 mm in a single pass (solid wood, not birch ply) and I'm super happy with it but that tool is going to go through some serious modifications to make it safe. It can set just about anything on fire fair distance away and will fry your eyeballs from half a kilometer if not more. Any idiot with a few bucks to spare can go and order one and they have absolutely no clue about the kind of damage a machine like that can do. It looks so innocent, it's completely deceptive.