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Over-Extrusion, Blobs, and Zits

Fix swollen walls, rough top surfaces, seam blobs, and excess plastic without starving the print.

Start hereConfirm filament diameter/nozzle/profile, then calibrate flow and seam pressure. Do not compensate by lowering temperature so far that layers weaken.

First safe actionRun the first safe check and change one variable at a time.

Proof targetA small representative test no longer shows the original symptom.

Problem, repair steps and target result for over-extrusion, blobs, and zits — Match the failed area to the visual before changing a setting.

Repair progress0 of 7 complete

Step 1 of 7

Confirm physical nozzle size and slicer nozzle profile.

Visual reference while completing step 1 of over-extrusion, blobs, and zits — Keep the problem and target visual open while you make this change.

Why this matters

More material is commanded than the line geometry needs.

Setting or checkFlow

Calibrate with a repeatable method; avoid large reductions.

Expected result

Wall dimensions improve.

Step 2 of 7

Verify filament diameter setting and remove any accidental global flow override.

Visual reference while completing step 2 of over-extrusion, blobs, and zits — Keep the problem and target visual open while you make this change.

Why this matters

Slicer calculations do not match hardware.

Setting or checkTop-surface flow

Tune only after global flow is correct.

Expected result

Top surfaces are closed without ridges.

Step 3 of 7

Inspect for hotend leakage or nozzle buildup.

Visual reference while completing step 3 of over-extrusion, blobs, and zits — Keep the problem and target visual open while you make this change.

Why this matters

Oozing and pressure remain high.

Setting or checkPressure advance

Controls transient pressure, not average flow.

Expected result

Seams are small and consistent.

Step 4 of 7

Print a controlled flow calibration and adjust in small increments.

Visual reference while completing step 4 of over-extrusion, blobs, and zits — Keep the problem and target visual open while you make this change.

Why this matters

Starts and stops leave local excess.

Setting or checkSeam position

Can hide but not solve excess pressure.

Expected result

Layer bonding remains strong.

Step 5 of 7

Tune temperature for the material.

Visual reference while completing step 5 of over-extrusion, blobs, and zits — Keep the problem and target visual open while you make this change.

Why this matters

Plastic drops onto the model.

Setting or checkFlow

Calibrate with a repeatable method; avoid large reductions.

Expected result

Wall dimensions improve.

Step 6 of 7

Tune pressure advance/linear advance if the printer supports it.

Visual reference while completing step 6 of over-extrusion, blobs, and zits — Keep the problem and target visual open while you make this change.

Why this matters

More material is commanded than the line geometry needs.

Setting or checkTop-surface flow

Tune only after global flow is correct.

Expected result

Top surfaces are closed without ridges.

Step 7 of 7

Adjust seam placement/wipe only after flow is correct.

Visual reference while completing step 7 of over-extrusion, blobs, and zits — Keep the problem and target visual open while you make this change.

Why this matters

Slicer calculations do not match hardware.

Setting or checkPressure advance

Controls transient pressure, not average flow.

Expected result

Seams are small and consistent.

Controlled test log

Change one variable, then record what happened

This keeps temperature, retraction, speed, mechanical, and material tests from blending together. The history stays private in this browser.

Open proof report →

No controlled tests logged yet. Record the first change before adjusting a second variable.

Do not repeat the full print yet

Prove the repair with a small test

Test model100 mm extrusion and thin-wall test

Setup

Use the same nozzle, material and hotend temperature planned for the print.

Pass condition

Flow is smooth and the wall is continuous with stable width.

If it still fails

Clicking, gaps, pulsing or inconsistent line width remains.

Recheck visual diagnosis

Complete the repair steps, run the proof test, and record the result.

Only if the proof test still fails

Next strongest repair paths

Do not stack these changes. Open one related guide based on the evidence that remains.

Visual guide for flow rate and extrusion multiplier calibration

CalibrationFlow Rate and Extrusion Multiplier Calibration

Use this next when the symptom changes with extrusion width or wall thickness.

Open guide →

Visual guide for pressure advance / linear advance tuning

CalibrationPressure Advance / Linear Advance Tuning

Use this next when corners, seams or speed changes leave blobs or gaps.

Open guide →

Visual guide for how to fix stringing in 3d prints

StringingHow to Fix Stringing in 3D Prints

Open this related Stringing guide when the first repair path does not fully explain the remaining symptom.

Open guide →

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