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Calibration

Pressure Advance Calibration Mistakes That Ruin Prints

Pressure advance can clean corners, but bad values can create gaps, weak seams, under-extrusion after corners, and ugly small details. It should be tuned after basics are stable.

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Quick diagnosis

What this guide solves

Pressure advance can clean corners, but bad values can create gaps, weak seams, under-extrusion after corners, and ugly small details. It should be tuned after basics are stable.

Start with observation first. Do not change multiple slicer settings at the same time or the real cause becomes harder to find.

Best next action

Confirm the symptom

  • Corners look sharp but walls have gaps after direction changes.
  • Small features under-extrude after travel.
  • Seams become inconsistent after pressure advance tuning.
  • A value from another printer makes your prints worse.
  • TPU or PETG behaves badly with a PLA pressure setting.
Root causes

Most likely causes

  • Pressure advance was tuned before flow and temperature.
  • Wrong test speed or acceleration was used.
  • Slicer pressure/linear advance conflicts with firmware behavior.
  • The value is copied across materials and nozzle sizes.
  • Flexible filament compression makes the value inappropriate.
Fix order

Do this in order

  1. Step 1. Calibrate temperature and flow first.
  2. Step 2. Use a pressure advance test at realistic speed and acceleration.
  3. Step 3. Tune per material and nozzle setup.
  4. Step 4. Check corners and line continuity, not only sharpness.
  5. Step 5. Back off the value if walls starve after corners.
  6. Step 6. Save values in clearly named profiles.
Slicer Settings

Settings to check

Use these as practical starting points, then tune against your printer, material, nozzle, layer height, and model geometry. The safest workflow is one controlled change at a time.

Setting AreaWhat to check
PLA often tolerates cleaner pressure advance tuning than TPU.PLA often tolerates cleaner pressure advance tuning than TPU.
PETG may need different values due to ooze and pressure behavior.PETG may need different values due to ooze and pressure behavior.
Nozzle size changes require retesting.Nozzle size changes require retesting.
Very high speed profiles may need separate values.Very high speed profiles may need separate values.
Disable duplicate slicer/firmware compensation conflicts.Disable duplicate slicer/firmware compensation conflicts.
Printer checks

Mechanical and setup checks

  • Klipper and Marlin use different workflows and names.
  • Extruder type affects pressure behavior.
  • Loose belts can be mistaken for pressure issues.
  • Hotend flow limit affects calibration at high speed.
Material notes

Filament or resin notes

  • TPU and soft materials compress and respond slowly.
  • Wet filament makes calibration unreliable.
  • Filled materials can need retuning because flow resistance changes.
Validation

How to prove the fix worked

Print a corner test and a real small-detail part. If corners are sharp but gaps appear after turns, reduce the value and retest.

After the validation print succeeds, save the exact printer, material, slicer, nozzle, layer height, support, bed adhesion, and cooling setup in Profile Vault so the fix becomes repeatable.

Recommended tools

Helpful tool categories

Only use tools that match the diagnosis. Common helpful categories include PEI cleaning supplies, filament dryers, nozzles, deburring tools, calipers, support-removal tools, and safe resin handling equipment.

Affiliate disclosure: STLBEAST may earn from qualifying purchases when recommended-tool links are used.

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Related STLBEAST paths

Continue the fix path

Flow Rate Calibration GuideOpen the related STLBEAST path.Orca SlicerOpen the related STLBEAST path.Profile VaultOpen the related STLBEAST path.AI DoctorOpen the related STLBEAST path.Recommended ToolsOpen the related STLBEAST path.FixOpen the related STLBEAST path.