Filament › Cooling› Part cooling fanclose_fan_the_first_x_layers

First layers with special fan

How many layers at the start use a separate fan speed, usually off, so the part grips the plate well.

How it works

The fan cools freshly laid plastic. On the first layer that works against you: warm plastic sticks better to the plate. That's why the first layers use their own speed, the “Fan speed” on this same row, which is 0 by default.

After those layers, the fan follows each layer's time, or ramps up gradually if you set a ramp (“Full fan speed at layer”).

When to change it

For almost everything: 1, as it comes.
ABS, ASA or large parts that lift at the corners: 2 or 3.

Typical values

Value	What for
1	PLA Basicdefault
2–3	Materials that shrink

Watch out for

With many layers without fan, overhangs and bridges near the base come out worse.
If you leave it at 0 and set a ramp, the program still gives the first layer the special speed.

Goes well with

Initial layer fan: Fan speed Linear ramp up to: Full fan speed at layer

What Bambu Studio saysits help card, quoted

What Bambu Studio says

Set special cooling fan for the first certain layers.The part cooling fan of the first layer used to be closed to get better build plate adhesion and used for auto cooling function

Bambu Studio tooltip for this setting · AGPL-3.0

Helps with

The corners lift

In other slicers

Orca Slicer: No cooling for the firstCooling › Cooling for specific layerIt turns the fan off on those layers; Bambu instead lets you pick a speed (first_x_layer_part_fan_speed).
PrusaSlicer: Disable fan for the firstCooling › Fan settingsIt turns the fan off on those layers; Bambu instead lets you pick a speed (first_x_layer_part_fan_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