It's the white material used in tubes guiding filament towards the extruder and hot end. Bowden-style 3D printers require the use of PTFE tubes to ensure the extruder can push the filament properly, but direct extruders do not require such tubes.Mar 18, 2020
How do you unclog a PTFE tube?
Push down the ring on the coupling and push the PTFE downwards. Now that the heatbreak is gone, the tube can come out through the bottom along with the stuck filament. Pull the tube out through the other end. You might need to push it through with some kind of tool from the other end.
Does PTFE tube melt?
PTFE, also known under the brand name Teflon, has the lowest coefficient of friction of any known solid material and melts between 260°C and 327°C. It's fairly hard and fairly stiff too, so it's ideal for RepRap parts including things low friction bushings to main assembly parts.Jan 3, 2021