The only way to pull the filament out was to heat it up before.
I use Ultimaker filament.
I changed the ptfe coupler and raised the temperature from 210 to 225 celcius degree and started the exact same print again.
The same issue happened at the end, the only difference was that I was here and heard the motor doing a strange noise, going back and forth. I manage to pause the printing and and block the filament.
I still don't know what is triggering this issue. A retraction issue or an imperfect seam on the filament that catches an edge in the nozzle are my leads.
The filament shouldn't stick to the Teflon, maybe it expanded, you could try to pull it out with some pliers (be carefull not to break the filament or you won't have any grip on it anymore...
It probably happened during some retractions?
What is the brand of the filament?
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