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Process › Speed› Other layers speedenable_overhang_speed

Slow down for overhang

Slows down walls that hang out over empty space, depending on how far they hang, without slowing down the rest. It's what lets you print fast and still get good overhangs.

How it works

When a wall leans outward, each line sticks out a little past the layer below: part of its width has nothing underneath. Bambu Studio measures that percentage for each line (0%, fully supported; 100%, entirely in the air) and sorts it into four ranges: 10–25%, 25–50%, 50–75% and 75–100%, plus a fifth for lines that hang 100%. Each range has its own speed.

That way only what hangs gets slowed down: on a part with a small overhang, 95% of the walls keep their normal speed. Since version 1.9.1 the speed doesn't jump between ranges; it changes smoothly with the exact percentage.

When to change it

  • A figure with outstretched arms or a mug with a handle: leave it on, which is how it comes from the factory.
  • Turn it off only to save a few minutes on parts without overhangs, like a box with straight walls, or to track down the cause of a problem.

Typical values

ValueWhat for
YesDefault; only slows down what hangsdefault
NoEverything at wall speed

Watch out for

  • Turning it off hides the five overhang speeds.
  • Wall lines that hang 100% use their own speed (the “100%” field); bridges stretched between two supports use the “Bridge” speed.
  • The smooth transition between ranges only works with “Wall generator” set to “Classic”.

Goes well with

10%25%50%75%100%Detect overhang wallBridge
What Bambu Studio saysits help card, quoted

What Bambu Studio says

Enable this option to slow printing down for different overhang degree

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 · Yes

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

Helps with

Overhangs droop or look rough underneath

In other slicers

Orca Slicer
Slow down for overhangSpeed › Overhang speed
PrusaSlicer
Enable dynamic overhang speedsSpeed › Dynamic overhang speed
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