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Process › Support› Advancedraft_first_layer_density

Initial layer density

How solid the first layer of the support or raft is, the one that sticks to the plate. Nearly solid (90%) grips well; very open can come loose halfway through the print.

How it works

The first layer of the support is its foundation: if it comes loose, everything on top falls. At 90%, the lines sit almost touching and grip the plate like the first layer of the part.

Lowering the density saves some plastic and time on very large supports, but every line you remove means a little less grip.

When to change it

  • Most parts: the default 90%.
  • A large part with support under its whole base (a helmet printed upside down) on a plate that grips very well: 60–70% to save material.
  • Tall, thin supports that tip over (under a figure's raised arm): 90–100%.

Typical values

ValueWhat for
90%Defaultdefault
60–70%Savings on large supports
100%Maximum grip

Watch out for

  • It only affects the first layer; the rest of the support follows its own pattern and spacing.
  • If the support comes loose from the plate, before raising this make sure the plate is clean: grease from your fingers costs more grip than any density.

Goes well with

Initial layer expansionRaft layersBase pattern spacing
What Bambu Studio saysits help card, quoted

What Bambu Studio says

Density of the first raft or support layer

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 · 90 %

In Bambu Studio, the profile 0.20mm Standard @BBL A1 sets it to90 %

In other slicers

Orca Slicer
First layer densitySupport
PrusaSlicer
First layer densitySupport material
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