Partly rough surface when printing with PLA-CF

Bambu Lab X1 Series Bambu Lab X1C
11

Ok, here are some results (the changes always refer to the initial situation in 1):

  1. Bambulab PLA-CF profile with layer thickness 0.16mm. Only change: slow down for overhangs is increased from 10 to 30 mm/s (for 50 / 75%).
  2. Random start / stop per layer.
  3. No slow down for overhangs
  4. Bambulab PLA-CF profile, also slow down for overhangs is kept at original values
  5. inner wall speed reduced to 200 mm/s
  6. acceleration for regular print reduced from 10’000 mm/s^2 t 5000
  7. same as 4) but with random start/stop

20230630_151022695_iOS
20230630_151022695_iOS1920×1440 493 KB

20230630_151037725_iOS
20230630_151037725_iOS1920×1440 449 KB

20230630_151106226_iOS
20230630_151106226_iOS1920×1440 439 KB

20230630_151119904_iOS
20230630_151119904_iOS1920×1440 410 KB

Conclusion:

The bambulab standard profile works best, which would be 4). The reason I initially changed the overhang speeds is because I had huge issues with printing PETG (see here). Changing the values completely resolved the issues for PETG, but as I see know are not recommended for PLA-CF.

Still: the seam looks not nice and I would like to improve that. 7) could be an option, but those tiny artefacts also show that something should be changed.