Horizontal artifacts

I am getting some horizontal artifacts on one of my prints where I have those regular cutouts. I was used to see these artifacts only on the inside of the print when printing on a prusa-mini.

(Left prusamini, right BLX1)


Inside(prusamini)


Inside(BLX1)

First thought: It must be the print-direction. But checking in the slicer, the outer perimeter is always printed in the same direction.
Second thought: Outer-wall speed differences. But the ‘speed’-menu shows perfectly even speeds.

  • Latest Bambu Studio
  • 0.2mm standard preset with 3 perimeters and 30%infill

Any idea what could cause this?

Did a print with 50mm/s outer wall speed. It reduced the artifacts quite a bit, but still there.

None of the color-schemes in the slicer show any irregularities that match up with the artifacts.
Outer wall print-direction does not change.

Bump with some recent prints:

I’m looking into acceleration next…