I have horizontal stripes on the horizontal surfaces in my prints:
I tried changing temperature (205, 215 and 225 °C), material (pink PLA-SS, black PLA-matte and PLA+), layer height (0.12 and 0.2 mm), getting a better level, but I was unable to make them go away; with pink PLA-SS they are almost invisible, if present at all, so it could be at least partially material related.
In general they are almost undetectable when touching - the smaller ones I can't feel at all, the bigger a bit; they are always horizontal, never vertical. I was wondering if they could be leveling-related, but I was unable to make them disappear by adjusting the leveling, and in another print they were so regularly spatied they almost seemed by design:
I tried looking here and googling, but all the results are relative to z-lines (like this one), and I wasn't able to find anything related to this.
Any idea what's causing it?

