# Replacement Hot end jammed...(Dud: Needs Replacing:Closed) **URL:** \ **Category:** Hardware\ **Created:** [February 24, 2015, 10:07pm UTC](https://forum.lulzbot.com/t/replacement-hot-end-jammed-dud-needs-replacing-closed/1339 "2015-02-24T22:07:12Z")\ **Posts on this page:** 1\ **Showing post:** 1
**Author:** ![JonathanB](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.lulzbot.com/jonathanb/32/39_2.png) [@JonathanB](https://forum.lulzbot.com/u/JonathanB)\ **Post date:** [February 24, 2015, 10:07pm UTC](https://forum.lulzbot.com/t/replacement-hot-end-jammed-dud-needs-replacing-closed/1339/1 "2015-02-24T22:07:12Z")
Not sure what’s going on now, I had a thermistor go a few weeks ago, I was shipped a brand new replacement hot end, I’ve done a few 4 hour prints with with ABS, went to try to print a part this morning and it’s clogged. It get’s to temperature, the thermistor reads 230C but I can barely push the filament through by hand, ofcourse, if I try to print, the hobber just rips through the filament. Something is up… frustrating. \*update. I took the hot end apart and it looks like there is a piece of ABS stuck where the insulator piece meets the metal, almost like it expanded a bit too much. One other thing that concerns me about this hot end is that the resistor is completely loose in it’s hole, I can see an air gap almost all the way around, that means it barely has contact with the heater block, that can’t be good for long term health of the resistor, it also looks like ABS material came up through the nozzle threading (Third picture)… ![20150224_182334.jpg](https://us1.discourse-cdn.com/flex020/uploads/lulzbot/original/2X/1/1d9631012358d8fedd0a3c48f8db6642ed76ccd9.jpeg) ![20150224_173828.jpg](https://us1.discourse-cdn.com/flex020/uploads/lulzbot/original/2X/4/43b2e69aa1fb1df37eb9ca19a07275382e84246e.jpeg) ![20150224_173742.jpg](https://us1.discourse-cdn.com/flex020/uploads/lulzbot/original/2X/6/6ba8eb609e2774ccd649b227af12bd93ac27206b.jpeg) --- _[View the full topic](https://forum.lulzbot.com/t/replacement-hot-end-jammed-dud-needs-replacing-closed/1339)._