I do most of my engraving using a center origin. Its so easy to line up on a cnc machine with a nice pointy bit. Not so easy on the CO2 laser. I always end up a little off…
I decided to 3D print a holder for a couple of line lasers to make that easier. I have a fixed focus but if I had a working Z axis (someday) I would have used dot lasers. Then you can align them so they converge at the focal point. That would require pivots for each laser but with line lasers its much simpler. I just tilted them 15 degrees.
now its easy to get it centered every time
a couple of quick test items to be sure….