# Exceptionally hard clog - how to resolve? **URL:** \ **Category:** J1/J1s IDEX\ **Created:** [November 6, 2024, 10:46pm UTC](https://forum.snapmaker.com/t/exceptionally-hard-clog-how-to-resolve/38091 "2024-11-06T22:46:39Z")\ **Posts on this page:** 1\ **Showing post:** 13
**Author:** ![mehlawlarz](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.snapmaker.com/mehlawlarz/32/26828_2.png) [@mehlawlarz](https://forum.snapmaker.com/u/mehlawlarz)\ **Post date:** [December 13, 2024, 1:40am UTC](https://forum.snapmaker.com/t/exceptionally-hard-clog-how-to-resolve/38091/13 "2024-12-13T01:40:14Z")
Are you using the old style hotend? From the sound of it it seems to be the classic heat creep issue addressed in [Findings and solution for the Snapmaker J1 clogging problem](https://forum.snapmaker.com/t/findings-and-solution-for-the-snapmaker-j1-clogging-problem/30472). Where after a long print the heat will eventually creep into the cold side of the heatbreak causing the plastic to melt in the heatbreak. The print will continue fine for a while until the feed rate suddenly increase to the point where the incoming heat is no longer enough to melt the plastic or after the print stops and forms a plug. This normally should not happen as the heatsink and fan should keep the cold side cold but the old style hotend is known to often have severe underapplication of thermal compound from factory. There are a couple of solutions to this in the abovementioned thread but you can also check out: - [What I did to prevent the J1 extruders clogging](https://forum.snapmaker.com/t/what-i-did-to-prevent-the-j1-extruders-clogging/35620) - [New Snapmaker J1, 1 month experience and review (cooler mod and speedbench run)](https://forum.snapmaker.com/t/new-snapmaker-j1-1-month-experience-and-review-cooler-mod-and-speedbench-run/34708#hotend-5) - [J1/J1s Clogging Issues and New Hotend Kit Update](https://forum.snapmaker.com/t/j1-j1s-clogging-issues-and-new-hotend-kit-update/35034) --- _[View the full topic](https://forum.snapmaker.com/t/exceptionally-hard-clog-how-to-resolve/38091)._