Got a few spare DVD drives? You can use the laser from those drives to make a tiny laser engraver. Thingiverse member Isolt did just that, then made it safer and better looking with 3D printed parts.
The laser diode needs to be from a DVD drive that writes to discs, because the laser from a read-only drive isn’t powerful enough to engrave. The engraver’s other main electronic parts include an Arduino Nano and a laser housing with a glass lens. Isolt’s 3D printed parts are the enclosure, which has the smallest roller door I’ve ever seen.
[via Geeky Gadgets]