Thanks for your suggestions.
I’m printing at speeds around 50-100 steps / s. No need to hurry :-)
The odd thing is: this happens if I print designs which are approx. 180 deg.
The glass is rotated nicely and suddenly it is “set back” around 5-10 deg and the overlapping starts…
I will try the circle print and adjust while printing. Maybe I can reproduce it somehow.
Till now I tried it with the Hello World print from examples and adjusted the current then but couldn’t get to a point where it happened.
Btw. might be an usefull info : I’m using a Mac