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Filament › Cooling› Part cooling fanfirst_x_layer_part_fan_speed

Fan on the first layers

The part cooling fan speed during those first layers. At 0 it's off, so the first layer grips better.

How it works

It goes with “For the first”: that number says how many layers, this one says how fast. At 0 (default), the fan is off while the base prints.

If there's a ramp, the fan starts from this value and rises to the normal speed.

When to change it

  • For almost everything: 0.
  • Only if a base with fine details (small raised lettering, for example) comes out deformed by heat: try 20–30%.

Typical values

ValueWhat for
0%Default, offdefault
20–30%Base with fine details

Watch out for

  • With the fan on during the first layer, the part grips less and the corners lift sooner.

Goes well with

Initial layer fan: For the firstLinear ramp up to: Full fan speed at layer
What Bambu Studio saysits help card, quoted

What Bambu Studio says

Part cooling fan speed for the first few layers. Set to 0 to disable the part cooling fan on the initial layers for better bed adhesion

Bambu Studio tooltip for this setting · AGPL-3.0

Read more at the official source

This setting on the Bambu Lab wiki
In your profileBambu PLA Basic @BBL A1 · 0 %

In Bambu Studio, the profile Bambu PLA Basic @BBL A1 sets it to0 %

In other slicers

Orca Slicer
No clear equivalent.
PrusaSlicer
No clear equivalent.
Cura
Initial Fan SpeedCoolingIt's the starting speed; then it ramps up until the layer set in cool_fan_full_layer.

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