ExtrudoWhy is my 3D print layer separation?
Layer separation is usually caused by the nozzle temperature is too low for the layers to bond properly, or the print is cooling too fast between layers. Layers split apart or the print cracks along a layer line, sometimes breaking apart entirely
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Quick reference
| Defect | Most likely cause | First thing to try |
|---|---|---|
| Layer separation | The nozzle temperature is too low for the layers to bond properly, or the print is cooling too fast between layers | Raise nozzle temperature |
What it looks like
Layers split apart or the print cracks along a layer line, sometimes breaking apart entirely
Most likely cause
The nozzle temperature is too low for the layers to bond properly, or the print is cooling too fast between layers
How do I fix layer separation? Step-by-step
- 1
Raise nozzle temperature
Increase your nozzle temperature by 5-10°C — hotter plastic bonds better to the layer below it.
Done when: Layers resist being pulled apart by hand more than before
- 2
Reduce part cooling fan speed
Lower your cooling fan speed, especially for the first 10-15 layers, so each layer stays warm enough to bond with the next.
Done when: No visible fan-related layer weakness on a test print
- 3
Shield from drafts
Block drafts or use an enclosure, especially important for ABS and other high-temperature materials.
Done when: No visible airflow near the printer during printing
Frequently asked
What causes layer separation in 3D prints?
The nozzle temperature is too low for the layers to bond properly, or the print is cooling too fast between layers
How do I fix layer separation on my printer?
Follow the step-by-step fix above, starting with "Raise nozzle temperature". 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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