I keep thinking about doing it. What keeps me from it is trying to figure out how to mount the last mirror. It needs to be a fixed mount so that it aligns with the X-axis, but then the focusing mirror needs to move with the Z-axis to change height from what you’re cutting. I’m sure I could design some type of mount to come off of the top of the gantry, but I haven’t gotten that far.
It’s about $500 worth of materials to get a 60W laser, power supply, mirrors, and mounts.
At that point, I decided to just buy a cheap diode laser from banggood. I bought one of the 50cm x 65cm engravers. It’s only a 3.3kW. It doesn’t cut, but it’s a good start for engraving.