I've heard that when the teflon starts to wear, the cold pulls will start to look something like this. How many hours do you have on the teflon insulator, and what material/temps are you printing?
Speaking from my own experience, when I put new teflon insulators on, it changes many characteristics of filament flow (for the better) such as cold pulls, retraction, and feeder tension)
that's actually how it looked when I tried the method as well.
I got my printer about a week now.
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