I have a 3040 machine and recently had a visit from Phil at HPC for a service. One of the best bits of advice I had about realignment, and something that is so simple and yet I hadn't thought of it, is to move the gantry to the left (closest to the tube firing end
), get the red dot in the middle of the next mirror and move the gantry away (adjusting the screws as needed). I'd spent ages trying to align the laser before, which at one point missed the mirror completely and hit the inside casing of the machine.
I'm a complete novice with these machines and yet with a little patience and just doing it, you work it out.