Having trouble with hot end thermal runaway
Hello,
I have been recently having an issue with thermal runaway. I have replaced the part fan and the thermistor. Got a couple prints in after that but now I am getting the runaway again. It appears to occur just after the temp is dropped a couple layers in. Any thoughts on where to look next? I am assuming I may have to replace the heater as well. Printer is about 3 years old.
Thanks,
John
Fan Isolation
I've seen this with high performing part cooling fans, and parts that deflect the airflow towards the heater block.
I rolled in Silicone Socks on all of mine, and the problem never resurfaced on my 19 machines.
Source: Amazon.com: 3D Printer Heater Block Silicone Socks Cover for E3D V6 PT100 Extruder Hotend Blue Color Eewolf : Industrial & Scientific
Note: I usually trim the nozzle opening back to the diameter of the entire nozzle to prevent a glob of doom if the sock shifts.
Solution
Thanks @djkirkendall. That did the trick. I figured it had to do something with the fan because it always happened after the temp change.
Now back to more printing.
Thanks,
John