Hi this issue links into another post i made about a problem extruding pla from the nozzle.
What is happening is with the teflon barrel itself, its warping and deforming causing the pla to leak from the teflon threading. The temperatures are well controlled, and the thermistor is correctly positioned inside the notch on the brass hotend. Is there anything i can replace the teflon barrel with?
I had two of these white barrels and the one i replaced had a melting issue where the hole at the threaded end became too narrow due to melting.
Is there anything I can do?
Hi abrooksdavis,
either you overtightened the screws fixing the hotend, overheated it, or those tubes are made of a very strange variant of PTFE.
I guess you don’t have a chemnistry lab available to quickly check the composition, but if you have some other PTFE for comparison, you could at least tell whether it “seems” right: PTFE has (non-unique, but still) quite special surface feel.
As for the screws, a small amount of pressure (barely hand-tight) is enough to fix the hotend to the extruder. But the screws then may come loose during printing due to vibrations, so counter nuts or two drops of loctite are very helpful.
Just to be sure, did you check the temperature of the hotend with a second thermometer, e.g. a thermocouple?
Cheers,
kuraasu