Hot end issues

[ROBRMI]

Ok, so all was well, with some minor print quality issues i was working on, and then i noticed a leak coming out of the hot end where the peek enters the metal of hot end. It was broken, so i ordered a new hot end, and some peek insulators so i could repair and have a spare hot end. The new hot end, as soon as i put it in, was heating slowly, but heating up. Finally got up to 225 deg c. I was noticing some smoke comingg out of the little holes on the hot end, but didn't worry. So i made a small extrusion feed manually, and the hot end dropped down sleightly, and i noticed the peek insulator was melted where it enters the hot end?

any suggestions? any recommendations for a good method to clean out both hot ends from the melted plastic to rebuild the head?

not sure why it melted. Thermister was showing 225 deg C.

[Polygonhell]

Ok, so all was well, with some minor print quality issues i was working on, and then i noticed a leak coming out of the hot end where the peek enters the metal of hot end. It was broken, so i ordered a new hot end, and some peek insulators so i could repair and have a spare hot end. The new hot end, as soon as i put it in, was heating slowly, but heating up. Finally got up to 225 deg c. I was noticing some smoke comingg out of the little holes on the hot end, but didn't worry. So i made a small extrusion feed manually, and the hot end dropped down sleightly, and i noticed the peek insulator was melted where it enters the hot end?

any suggestions? any recommendations for a good method to clean out both hot ends from the melted plastic to rebuild the head?

not sure why it melted. Thermister was showing 225 deg C.

You have to verify the thermistor temperature before trusting it. The only way to do that is with a thermocouple.
You're certainly not melting peek at 225 it QA probably over 250C.
The thermistor will read incorrectly of it's not well seated and it will read low if you have a fan blowing on the heater block.

[ROBRMI]

Ok, so all was well, with some minor print quality issues i was working on, and then i noticed a leak coming out of the hot end where the peek enters the metal of hot end. It was broken, so i ordered a new hot end, and some peek insulators so i could repair and have a spare hot end. The new hot end, as soon as i put it in, was heating slowly, but heating up. Finally got up to 225 deg c. I was noticing some smoke comingg out of the little holes on the hot end, but didn't worry. So i made a small extrusion feed manually, and the hot end dropped down sleightly, and i noticed the peek insulator was melted where it enters the hot end?

any suggestions? any recommendations for a good method to clean out both hot ends from the melted plastic to rebuild the head?

not sure why it melted. Thermister was showing 225 deg C.

You have to verify the thermistor temperature before trusting it. The only way to do that is with a thermocouple.
You're certainly not melting peek at 225 it QA probably over 250C.
The thermistor will read incorrectly of it's not well seated and it will read low if you have a fan blowing on the heater block.

Thanks for the info. I managed to rebuild with the spare peek i had purchased. The thermister broke a wire at the glass bead, so i've got additionals coming, old one broke too, so i'm testing with heated bed thermister installed on hot end. Guess i'll go get a thermocouple/heat sensor today to test. Is there a parameter setting in config to offset/scale the thermistor feedback?