Bottom line: Pressure Advance compensates for extrusion lag during acceleration and deceleration, which cleans up corners and surface finish. It must be tuned after flow calibration and re-checked whenever speed or material changes. Too low a value leaves bulging corners; too high a value starves them.
What the setting does
| State | Symptom | Direction |
|---|---|---|
| Too low | Bulging corners, lag | Increase slightly |
| Correct | Consistent corners | Keep |
| Too high | Thin corners, gaps | Decrease slightly |
Tuning order
- Calibrate flow and E steps first.
- Print a test model with stepped values.
- Compare corner bulge and thinning.
- Re-tune after changing speed.
- Re-tune after changing material.
Costly mistakes
- Tuning before flow is correct.
- Increasing the value until corners look sharp by eye only.
- Not re-tuning after speed changes.
- Ignoring material differences.
- Judging surface without checking layer adhesion.
Buyer / engineer checklist
- Is flow calibrated?
- Are corners consistent?
- Was it re-tuned after speed or material changes?
- Are surface and layer strength both checked?
- Are settings recorded per material?
Tell us the printer and material and we can help narrow the tuning range.Printing advice