With the stock extruders heating block on the Anycubic Kossel I was encountering Thermal Runaway errors with low ambient temperatures. Ok, ok, I might have been printing outside in an undercover area but bear with me.

The error is caused when the extruders hot end can’t heat quick enough to reach the desired print temperature.

A workaround for this is to lower the print cooling fan speed, allowing the hot end to use less power to get to your goal. In hindsight, it seems a bit smarter to lower your energy spent heating with unnecessary fans blasting your work.

The problem was that this was also a clue to a bigger problem. Over time the power cable to the extruder was wearing thin after moving around so much for so long and eventually gave me this error.

Well the replacement extruder hot end was only $8 so I may have bought two. The one that came with the printer lasted a year but the age of this printer seemed like it would be obsolete soon so I thought I would stock up.