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Process › Strength› Wallsalternate_extra_wall

Alternate extra wall

Adds one more wall on every other layer. It interlocks with the infill and the part gains strength without paying the time of an extra wall on every layer.

How it works

With normal walls, the boundary between wall and infill sits in the same place on every layer: a weak vertical line where the part can split. With this option, odd layers get one extra loop; on even layers, that area is taken by the infill. Wall and infill lock together layer by layer, like the bricks in a wall.

It costs half of what adding a wall on every layer would, and it mainly improves the bond between layers and between wall and infill.

When to change it

  • A shelf bracket or a clamp that breaks right at the joint between wall and infill, or splits between layers: turn it on.
  • A decorative figurine or a prototype to check the shape: not needed.

Typical values

ValueWhat for
OffDefaultdefault
OnOne extra wall on alternating layers

Watch out for

  • On very thin parts, the extra wall may not fit on the layers where it's supposed to go and the effect is lost.
  • The part needs infill inside; it doesn't work in vase mode.
  • It's no substitute for raising the number of walls when the part really needs a thick shell.

Goes well with

Wall loopsInfill/Wall overlapEmbedding the wall into the infill
What Bambu Studio saysits help card, quoted

What Bambu Studio says

Add an extra wall on alternating layers to improve layer bonding and part strength without the full cost of a permanent extra wall.

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

In other slicers

Orca Slicer
Alternate extra wallStrength › Walls
PrusaSlicer
No clear equivalent.
Cura
Alternate Extra WallWalls

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