ExtrudoWhy is my 3D print stringing?
Stringing is usually caused by the nozzle leaks a little plastic while moving between parts because it isn't pulling back enough plastic first, or it's running too hot. Thin hair-like strands of plastic between parts of the print
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Quick reference
| Defect | Most likely cause | First thing to try |
|---|---|---|
| Stringing | The nozzle leaks a little plastic while moving between parts because it isn't pulling back enough plastic first, or it's running too hot | Cool the nozzle down |
What it looks like
Thin hair-like strands of plastic between parts of the print
Most likely cause
The nozzle leaks a little plastic while moving between parts because it isn't pulling back enough plastic first, or it's running too hot
How do I fix stringing? Step-by-step
- 1
Cool the nozzle down
Lower your nozzle temperature by 5-10°C and print a small test. Too much heat makes the plastic runnier and more likely to leak.
Done when: Fewer or thinner strings on the test print
- 2
Increase retraction distance
In your slicer, increase retraction distance by about 0.5mm (start around 4-6mm if your extruder is on the print head, a bit more if the extruder is far from the nozzle).
Done when: Strings are noticeably reduced
- 3
Turn on travel avoidance
Enable 'Avoid crossing perimeters' or 'Combing' in your slicer so the nozzle travels over solid areas instead of open air.
Done when: Nozzle path avoids open gaps in the preview
- 4
Check your filament isn't damp
Damp filament pops and oozes more. Dry it in a food dehydrator or dry box at a low temperature for a few hours if you suspect moisture.
Done when: Filament prints quietly without crackling sounds
Frequently asked
What causes stringing in 3D prints?
The nozzle leaks a little plastic while moving between parts because it isn't pulling back enough plastic first, or it's running too hot
How do I fix stringing on my printer?
Follow the step-by-step fix above, starting with "Cool the nozzle down". Each step includes a "done when" check so you know whether it worked before moving on.
Is this fix confirmed by other makers?
This entry is part of Extrudo's seeded defect library. Confirmation counts appear once real users report the fix worked.
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