Hello all, I believe I have an issue with under extrusion near the third or fourth layers. My plastic also jams and coils up a lot. I have looked up these issues several times and I always come back to conclusion the white nylon thermal insulator may be damaged or missing. I have got this part out once before, but I am not sure how to do it anymore. Also, when I pull the filament out to change colors or remove a clog, the filament no longer seems to taper to a point like it used to. Where can I buy a new one? What size is it? Does anybody have any information? I have seen threads here talking about this over the last year, but I do not know where and the conclusions never seemed clear. Any help would be great.