Tune pressure advance / linear advance

Molten plastic in the nozzle behaves like a compressed spring. Without compensation the printer over-extrudes into corners and under-extrudes leaving them — bulging corners and thin walls just after them.

Phase 4 — Motionabout 30 minper filament

How to do it

  1. Print a pressure-advance pattern across a range of values.
  2. Find the line with the most uniform corners.
  3. Set that value in firmware or the filament profile.
  4. This is per-material: PETG needs noticeably more than PLA.

How to read the result

Corners are sharp and even, with no bulge on entry and no gap on exit.

Your slicer may do this for you

OrcaSlicer and SuperSlicer generate a pressure advance tower under Calibration.
Open First Layer →
The app walks this in order, generates the test model for your nozzle and filament, and records what you measure so nothing has to be repeated. Free, no account, works offline.