When to use this guide
Use this page when the symptoms below match what you see on the printer. Work through the checks in order and avoid changing several variables at once.
- Walls look swollen or overfilled
- Top surfaces have ridges, blobs, or rough seams
- Thin walls measure too thick or too thin
- Gaps appear between walls and infill
- Parts are strong but dimensions are inconsistent
Most likely causes
These are the most common root causes. The correct fix depends on when the failure happens, which material is loaded, and whether the profile used to work before.
- Extrusion multiplier is not matched to the filament diameter and profile
- Temperature is causing material to over-expand or under-bond
- Pressure advance or seam settings are being confused with flow
- Nozzle wear or partial clogs are skewing the result
- The calibration model is being measured incorrectly
Safe fix order
This order is designed to prevent random tuning. Start with physical checks and material condition, then move into slicer changes.
- Start with a clean nozzle and dry filament so the calibration is not contaminated.
- Use one material and one nozzle size at a time.
- Print a simple calibration part with stable speed, normal temperature, and normal cooling.
- Measure walls with calipers in multiple locations and average the result.
- Adjust flow in small increments, then test a real part with top surfaces and walls.
- Save the result by filament type and brand in Profile Vault.
Settings and decision notes
Starting adjustmentChange flow in small 1–3% steps instead of large swings.
PLAOften close to baseline, but brand and color can vary.
PETGCan look over-extruded if temperature is too high or cooling is too low.
TPUDo not over-calibrate from a fast test. TPU needs slow, stable extrusion.
Bench checklist
Use this short checklist beside the printer before reprinting the full model.
- Clean or replace questionable nozzle.
- Dry filament if symptoms suggest moisture.
- Print a controlled test model.
- Measure several points with calipers.
- Adjust flow slightly.
- Confirm with a real product-style print.
What to do after it works
Print a small confirmation part before returning to a long print. Save the working material, temperature, cooling, speed, and support notes in Profile Vault so the same problem does not become a repeat mystery.