Cuts not perpendicular but not at opposite sides

I have build a DIY 40Watt Co2 Laser from scratch and i am having issues with the cuts.

Top X cut and Left Y are not perpendicular but its on the opposite side.
Check the image to understand what i mean.
I have try everything but with no success.
Any advise ?

This could indicate that your nozzle/lens is not mounted perpendicularly. Have you checked it with a 90 degree angle to the machine bed?

Additionally to @bernd.dk comment, the beam going into the lens isn’t centered. The result is an angled beam out of the lens…

It’s likely as @bernd.dk advised, but keep it in mind.

:smile_cat:

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