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Process › Quality› Precisionprecise_outer_wall

Precise wall

Adjusts the spacing between the outer and inner walls so the outer one lands exactly on the model's edge. Truer outer dimensions and more even layers.

How it works

Normally, the slicer overlaps the outer wall slightly with the inner one so they fuse well. That extra plastic has nowhere to go and pushes the outer wall a few hundredths of a millimeter outward: the part comes out just a bit larger and with small differences between layers.

With “Precise wall”, the wall spacing is calculated so the outer wall falls right on the model's edge, and the overlap is shifted inward.

When to change it

  • A lid or an insert that has to fit on the outside and always comes out slightly large: turn it on.
  • A part whose surface shows slightly uneven layers: give it a try.

Typical values

ValueWhat for
NoDefaultdefault
YesThe outer wall sits on the exact edge

Watch out for

  • It only shows up with Develop mode turned on in Preferences.
  • If the dimensions are still large, the problem is the amount of plastic (the flow) or the filament's shrinkage: use “X-Y contour compensation”.

Goes well with

X-Y contour compensationOuter wallInner wall
What Bambu Studio saysits help card, quoted

What Bambu Studio says

Improve shell precision by adjusting outer wall spacing. This also improves layer consistency.

Bambu Studio tooltip for this setting · AGPL-3.0

Read more at the official source

Bambu Lab wiki (index)
In your profile0.20mm Standard @BBL A1 · No

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

Helps with

Parts don't fit or holes come out small

In other slicers

Orca Slicer
Precise wallQuality › Precision
PrusaSlicer
No clear equivalent.
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