I did a few more tries with the same layout and it actually looks like codexmas is right. It was the left mechanical stop of the Eleksmaker A3Pro.
… which brings me to my next point. I just don’t understand how I have to proceed to set a reproducible starting point in the settings. Unfortunately (so far) I don’t have any limit switches on the axes.
I’ve already read the lightburn manual up and down, but I don’t understand how to set a starting point that can be controlled again and again - and permanently. So even if I quit Lightburn and restart it again, the starting point is always at a certain position.
That would be important for me, so that I can always position a workpiece the same way, or if, for example, after “XY” cutting attempts I notice that it has not been cut completely. Then I would like to postpone further cutting attempts. But the starting point must always be the same, otherwise the cuts won’t fit - that’s logical.
This is one of my biggest problems at the moment - the reproducibility and repeatability of the starting point.
Translated with www.DeepL.com/Translator