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Filament stuck in PTFE tube and won’t unload
I have just added an enclosure to my MK4S. This includes the filament PTFE guide tube into the print head. Loading is fine but it is very difficult to unload because the filament is stuck in the tube even after three attempts to unload. I had to remove the assembly. I noticed the filament has marks from the gears - is mine too tight?
Any advice would be welcome.
NB: I am using only Prusament filaments.
Posted : 22/04/2025 5:45 pm
RE: Filament stuck in PTFE tube and won’t unload
I have also marks on filament after unloading.
I would check for a sharp edges in the filament part, for example from cutting the tube.
Posted : 23/04/2025 11:31 am
RE: Filament stuck in PTFE tube and won’t unload
The marks are likely normal. Can you post a picture to be sure?
Posted : 23/04/2025 11:34 am
Topic starter
answered:
RE: Filament stuck in PTFE tube and won’t unload
The marks on the filament appear to be formed by the gear teeth and may be causing the failure to unload. I hope they are useful.
Posted : 24/04/2025 5:51 pm