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Process › Quality› Advancedreduce_crossing_wall

Avoid crossing walls

When the nozzle moves from one spot to another without releasing plastic, it goes around on the inside of the part instead of cutting across the outer wall. Fewer strings and fewer marks on the surface.

How it works

To get from one area of a layer to another, the nozzle moves without printing (a “travel” move). If that move crosses the outer wall, the drop that leaks out of the nozzle leaves a string or a mark right on the face you see.

With this option, the travel move follows the outline of the layer on the inside of the part and only leaves where there's no outer wall. It can only go around if the start and end points are both inside (or both outside) the wall; if one is inside and the other outside, there's no way around.

When to change it

  • A filament that drips (PETG, TPU, some shiny PLA) on a part with many separate areas in the same layer, like a miniature table (each leg is a separate area) or a crown with points: turn it on.
  • A solid part with a single area, like a cube or a coaster: it barely changes anything.

Typical values

ValueWhat for
OffDefault; straight-line traveldefault
OnGoes around inside the outline

Watch out for

  • Detours make travel moves longer, so they add some time. “Avoid crossing wall - Max detour length” limits how much.
  • It only works within one layer of the same object; it doesn't detour between different objects.

Goes well with

Avoid crossing wall - Max detour lengthAvoid crossing wall - Includes supportWipe speed
What Bambu Studio saysits help card, quoted

What Bambu Studio says

Detour and avoid traveling across wall which may cause blob on surface (when travel length greater than Travel distance threshold)

Bambu Studio tooltip for this setting · AGPL-3.0

Read more at the official source

This setting on the Bambu Lab wiki
In your profile0.20mm Standard @BBL A1 · No

In Bambu Studio, the profile 0.20mm Standard @BBL A1 sets it toNo

Helps with

Strings or cobwebs between parts

In other slicers

Orca Slicer
Avoid crossing wallsQuality › Walls and surfaces
PrusaSlicer
Avoid crossing perimetersLayers and perimeters › Quality (slower slicing)
Cura
No clear equivalent.

Names taken from each program's code (Orca Slicer 2.4.2, PrusaSlicer 2.9.6, Cura 5.13.0). Credits