Red Dot Laser Pointer for 40Watt laser cutter.

thingiverse

Mount these two components onto most standard laser cutter/engravers' air shroud using a 10mm diameter red laser pointer. The beam can then be angled so that when it's centered directly below the cutting nozzle, the focus distance will be optimized. To secure everything in place, simply tighten the M4 screw and fine-tune the angle with an M3 screw.