Pressure advance: sharp corners and even lines

It compensates nozzle pressure when the printer accelerates or brakes: without it corners bulge or stay hollow.

Calibration

1. Run OrcaSlicer’s Pressure advance test (Calibration > Pressure advance).
2. Print it and find the value where corners are sharpest and lines even.
3. Save the value in the filament profile.
4. Repeat for each filament and for different nozzles.

When you need it

• Bulging or gapped corners
• Lines thicker at the start and thinner at the end
• Non-Bambu printers: Bambu machines calibrate it themselves

Note

On Klipper it’s called pressure advance, on Marlin linear advance (K factor).