Lens holder is not plumb

We went round & round on this a while ago and the conclusion seems to be that if the beam:

Goes into the center of the Mirror 3 opening
Doesn’t hit anything inside
Comes out through the center of the nozzle
Remains perpendicular to the platform
Then there’s nothing to worry about.

Now, if you do have one of those problems, there should some screws holding the laser head to the X axis carrier in slotted holes that allow some angular adjustment. Two of them appear in the top photo on my blog post and there’s another on the far side; yours may be similar.