Well, having a 50w CO2 laser myself, safety should be paramount. The open chassis of the taz makes it a dangerous thing to convert to a laser etcher. When printing, sure there is the hot end, but its damn hard to get your fingers in there to get hot plastic squirted on them. An IR laser you can’t see. Thankfully that laser kit isn’t IR, its sub-blue at 445nm so at least its visible.
Lasers used in this manor are ablative and vaporize material. This releases toxic and often carcinogenic compounds into the atmosphere. Proper evacuation of the noxious vapors is critical to safety. And whatever you do, don’t laser PVC based compounds. Not if you like your lungs and your printer. It releases chlorine gas which not only is extremely hazardous to breath but its extremely corrosive and will destroy metal components of your printer in short order. The chlorine gas mixes with water in the air and forms hydrochloric acid. More nasty stuff. Laser cutting and engraving is nothing to be taken lightly. There are extreme hazards involved here, and many are not as obvious as the beam of the laser but just as deadly.
Another thing to remember, the bed surface on a taz 5 is not glass, its PEI and could be damaged by the laser if you don’t put a barrier to prevent it.
I tried to watch the video of it cutting and the one of it engraving. The movement was so slow, it was like watching paint dry. I couldn’t find anywhere on the site what their cut or scan rate was in MM/s speed at all.
Yes, my laser machine is way more expensive, and yes, its only a laser, not 3D printer, but even my cheap-o chinese laser can cut and scan at 500mm/s. Its not a particularly fast machine. The better laser machines cut at 1000 or 1500mm/s.
You should really think long and hard about doing this. Whatever you are laser etching, would you light it with a match and take a deep breath of the smoke? If not, why are you doing essentially the same thing with a laser unless you have an air handling unit to process the fumes?