@MikeyH post pretty clearly defines the issue.
If you examine both Y paths that Mike circled, they are wiggling. You can see part of the anomaly where I marked the center of both characters. This is definitely an mechanical issue.
This usually indicates an X axes issue, since the X axes should not move doing either of these characters. In the center these two axes are changing direction, so any problem with one axes you’ll see when it changes direction.
Anything with these could probably be a so called optical issue, but whatever this is, it’s changing in multiple places, so I’d classify it as mechanical. Meaning if your lens, mirror mount or head moves, that’s going to cause issues.
Great, I have a bridge, across the SF bay, you’d love to own.
You mention the Z moves, is this up and down? Which direction does it move?
I have a 6 year old OMTech China blue 50W and it still works fine. It’s head is on a bearing and doesn’t wiggle.
Suggest you check the X axes for some kind of mechanical anomaly.
I doubt, if you’re new at aligning lasers, it’s really aligned… You have no idea how often we hear this and it turns out not to be true. Until you get your head around how exactly it works, you’ll be surprised – multiple times.
Sometimes I think about how I could create this with a vertical line, I don’t believe you can, so, it has to be some kind of mechanical issue.
There must be some way to get to them. These belts must be adjustable… Might post a few photos and maybe we can help you find them.
On mine, remove the red (that I put in) striped panel. Behind it (on the right, circled in red) is where you adjust the right hand side belts of the Y axes.
Good luck.
