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Process › Strength› Advancedinfill_combination

Infill combination

Prints the infill once every few layers, thicker, while the walls stay thin. Saves time on large parts printed with low layers.

Not always visible. In Bambu Studio this setting only shows up when “Sparse infill density” is greater than 0. See Sparse infill density.

How it works

Walls need thin layers to look good; nobody sees the infill. With this option the slicer groups the infill of several layers and prints it in one go, with a taller bead of plastic. The walls are still printed layer by layer.

The combined thickness is the largest multiple of the layer height that doesn't exceed the nozzle diameter. With a 0.4 mm nozzle: 0.08 mm layers → infill every 5 layers (0.40 mm); 0.12 → every 3 (0.36); 0.16 → every 2 (0.32); 0.20 → every 2 (0.40). At 0.24 or 0.28 no multiple fits and nothing gets combined.

When to change it

  • A large planter or a costume helmet printed at 0.12 mm so the walls look smooth: turn it on and save quite a bit of time.
  • 0.24 or 0.28 mm profiles: it does nothing, leave it off.

Typical values

ValueWhat for
NoDefault; infill on every layerdefault
YesInfill every 2–5 layers depending on height

Watch out for

  • Thick infill needs more plastic per second: if the filament has a low maximum flow (how much plastic it can melt per second), the printer will have to slow down and the savings shrink.
  • The solid top layers rest on infill with taller gaps; on large lids you may need one more solid layer.

Goes well with

Layer heightSparse infill densityTop shell layers
What Bambu Studio saysits help card, quoted

What Bambu Studio says

Automatically Combine sparse infill of several layers to print together to reduce time. Wall is still printed with original layer height.

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

In other slicers

Orca Slicer
Infill combinationStrength › Advanced
PrusaSlicer
Automatic infill combinationInfill › Reducing printing time
Cura
Infill Layer ThicknessInfillIn Cura you set the infill layer thickness by hand (a multiple of the layer height); it isn't automatic.

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