▲ 3 r/ElegooNeptune3
PETG stops extruding mid print on Neptune 3 – heat creep from dead hotend fan?
My Elegoo Neptune 3 starts printing PETG normally, but after some time it stops extruding and the extruder grinds the filament.
I replaced the entire hotend and nozzle, dried the filament, reduced retraction, etc. Still happening.
I noticed the heatsink/dissipator gets VERY hot, and the front hotend cooling fan (under the extruder motor) is not spinning at all.
Symptoms:
- Extruder starts grinding/masticating the filament
- Filament gets deformed/swollen near the hotend
- I have to remove the filament, cut the damaged section, and reload it
- After reloading, it prints normally again for some time
- Dissipator/heatsink gets VERY hot to the touch
- Extrusion becomes inconsistent with blobs and underextrusion before failure
The filament comes out swollen/deformed when I remove it, and after cutting/reloading it prints normally again for a while.
Does this sound like classic heat creep caused by a dead hotend fan?
u/Mysterytown — 6 days ago