Pressure Advance | Prusa Knowledge Base

Pressure Advance aims to improve the quality of printed parts by compensating for the pressure changes in the nozzle during printing.

It replaces Linear Advance on MK4/S, MK3.9/S, XL, and MINI/+, from firmware version 5.0.0 and above.

It is possible to find Linear Advance commands, M900, even on printers that support Pressure Advance. In that case, old M900 K commands are automatically converted 1:1 to Pressure Advance value.

The Pressure Advance value is set based on the latest command, either M900 (converted 1:1 to Pressure Advance value) or M572.

M572 GCode

The Buddy-firmware-specific GCode M572 is used to set parameters for Pressure Advance.

D: Set the extruder number.
S<value>: Set the pressure advance value. If zero the pressure advance is disabled.
W: Set a time range in seconds used for calculating the average extruder velocity for pressure advance. The default value is 0.04.

PrusaSlicer default start GCode

The default start GCode includes an M572 command that sets Pressure Advance parameters. The example screenshot below is taken from the start GCode of an MK4/S print.

In this example, the S parameter changes, depending on the nozzle diameter.

We recommend keeping the default S parameter, optimized for most applications on our printers.

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2 comments

iura ch

•

Are there any other ways to set the PA value outside of start/filament GCode?
Ideally I would like to adjust it live during the print. But at least to be able to change the PA for reprinting previously sliced files. Like, remove all PA settings from the GCode, but set it manually on the printer, or via PrusaConnect.

black kvader

•

While you can say that Pressure Advance is "advanced feature" it is very important if you use different filaments (brands). Your PLA prusament is rather stiff and solid, while other brands tend to be more flexible. This results in slightly higher values of pressure advance for other filaments. Could you please add pressure advance calibration to the Prusa slicer? I'm actually surprised that there is no calibration similar to OrcaSlicer. The best value for my PLA (mk4s) is actually around 0.056. Please add calibration to the Prusa Slicer, thank you

black kvader

•

Sorry, you actually have a calibration feature but you didn't included the link here :)

https://garethky.github.io/PrusaSlicerPressureAdvanceCalibration/

James63

•

PA is present, it's just in the start gcode like the article says. I'd prefer a dedicated box and label for it too fwiw, but it's definitely there.