Quote Originally Posted by veclock View Post
Hi again, thanks for your answer!

What exactly is the PTFE lining?

As you can see in the two images to the right, there are filament leaking, I wonder if it's clogged inside.
Here is a PTFE Throat inside is a lining. this lining gets deformed.

What is happening is the filament is getting into a gap between the nozzle, throat and the heat block and staying too long and crystallizing, thereby clogging the filament path.