Core One MMU3 Filament unloading getting stuck
I am having a problem where the filament is getting stuck in the nextruder above the gear and below the Fitting M5-4 where the PFTE is held. If I unscrew the fitting and pull up manually the filament comes free without too much force. The resistance seems to be just enough that the MMU3 cannot unload the filament.
I have cleaned out path and blown it out with canned air. I disassembled the nextruder and can't see anything obvious that is causing the filament to stick.
what am I missing?
RE: Core One MMU3 Filament unloading getting stuck
Have you changed the festo fitting?
Prusa modifies the internal dimension to, I believe 2.6mm for the MMU3, if you have n unmodified festo, that could be the reason for jamming!
regards Joan
I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility.Location Halifax UK
RE:
Thanks for the quick response. The festo is the one supplied by Prusa. My MK4s was purchased late 2024 and the upgrade to core one was done in July 2025- The fitting is that which was shipped with one of those kits (can't remember)