Originally Posted by
agrasyuk
fisrt of all let me say i understand the frustration, it took me quite some time to identify and fix the same very issue. but its possible.
since you say "when Y axis moves..." to me it sounds like your first miror is out of alignment. adjust it fisrt so the beam stays centered on second mirror no matter the Y position. then mirror 2. in my case i didn't need to touch the third one at all.
you mentioned in other thread upgrading to red dot beam comibner. well, i did not bother to get that upgrade so not to mess with alignment again (even though my machine already has the mount for combiner lense and pointer pre-installed ).