Cosmetic Issue

How to Fix Belt Pattern / VFA (Vertical Fine Artifacts)

Step-by-step fix for belt pattern / vfa (vertical fine artifacts) on Bambu Lab printers including X1C, H2D, P1S, and A1.

How do I fix belt pattern / vfa (vertical fine artifacts)?

1
Increase outer wall speed to 200+ mm/s. Belt pattern is most pronounced around 120 mm/s on CoreXY printers (H2D/X1C/P2S). Faster printing actually reduces the effect.
Setting: speed.layers.outerWall
2
If outer wall can't go above 120 mm/s (e.g. PETG flow limit), increase nozzle temperature by 5°C and reduce layer height to allow higher speed.
3
Check belt tension — both X and Y belts should be equally tight. Uneven tension amplifies the pattern on one axis.

Pro tip: Select "Good Cosmetics" above — it tunes outer wall speed and acceleration to minimize belt pattern artifacts on CoreXY printers.

Related Print Issues

Uneven First Layer Stringing / Oozing Visible Layer Lines Elephant Foot (First Layer Bulge)Warping / Curling / Lifting

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