Delamination: layers that split apart

Layers don’t fuse well and the part breaks along the print lines.

Causes

• Temperature too low
• Fan too high
• Wet filament
• Drafts or a cold chamber (ABS, ASA)
• Layer height too high

Fixes in order

1. Raise the temperature 5–10 °C.
2. Reduce the fan: PETG 30–50%, ABS and ASA 0–15%.
3. Dry the filament.
4. Close the chamber and preheat for 10 minutes.
5. Keep layer height under 75% of the nozzle.
6. Reduce speed by 20%.

Common mistakes

• Fan at 100% on PETG, ABS or ASA
• Using old, wet filament
• Adding infill instead of improving layer fusion