Yesterday after another hour or so I think the printer is back on rails.
previously my retraction was something from PrusaSlicer defaults so like 5-6mm, now 3,5mm
I changed the nozzle to a new 0,4mm which gave good results right away (cleaner first layer and no colision by the nozzle with the lower layer)
an IPA clean mentioned in previous comment worked great. Still one layer of paper-glue stick is used and is helpful
I leveled the bed with some margin. I always leveled it to fill good friction with the piece of paper, but now, right when the friction starts i loosen the know/spring half of a degree just that the friction is gone.
Gave Cura an another try with this one: lensdump.com/a/9ZGlC first successful print from the start of this post
flow 0,9 and initial layer flow 1,01. In PrusaSlicer it was 0,95 I think
layer height 0,2
initial layer height 0,2
Z-hop 0,3 (sadly had to use it to avoid hitting the previous layer
top/bottom layer pattern = concentric
infill 20%
printing and initial nozzle temp = 210*C
printing bed temp 60C, and initial 65C
print speed 40mm/s, and top/bottom print speed 10mm/s
retraction enabled with 3,5mm distance
brim on
Travel Tab: ENABLED: retraction, retract at layer change, z-hop when retracted, z-hop only on printed parts. Yet to try combing mode
the print-initial nozzle clean at the bed edge still sometimes gets dragged to the center but it happens partially or doesn’t mess the print and I can pick it up after brim is printed
third successful print (PrusaSlicer gave me warnings about supports needed, but Cira didn’t):