Blobbing and oozing usually come from pressure, moisture, temperature or travel settings. Increasing retraction alone can hide one symptom while creating jams or under-extrusion. Correct the extrusion chain first.
Check the material
- Dry the spool and verify diameter.
- Inspect for contamination or mixed material.
- Confirm the nozzle is clean.
Control pressure
- Reduce excessive flow.
- Tune pressure advance or linear advance.
- Limit travel over open areas.
- Use a stable temperature.
Verify the fix
Print a test part with the same geometry and speed. Check corners, seams and small gaps, then inspect for new under-extrusion.
| Symptom | Likely cause | Action |
|---|---|---|
| Small blobs | Pressure or moisture | Dry and tune pressure |
| Stringing | Temperature and travel | Lower temperature or travel |
| Corner bulge | Over-extrusion | Calibrate flow |
| Missing lines | Too much retraction | Reduce retraction |
Common engineering mistakes
- Changing retraction first.
- Ignoring moisture.
- Tuning multiple parameters at once.
- Judging only one test print.
- Leaving flow uncalibrated.
Buyer checklist
- Is the filament dry?
- Is flow calibrated?
- Is pressure control enabled?
- Does travel cross the part?
- Was the fix tested at production speed?
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