this post was submitted on 14 Sep 2023
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Yeah that's right, I bought the wrong nozzle and using it messed up my hotend. Replacing the whole hotend at that point was easier than trying to clean the plastic out from all the places it had leaked into.
Alright, well then I wouldn't rule out a very loose connection at the thermistor then.
I'd probably test the thermistor's reading with no steppers active. (unplug them if you have to)
If signal is still noisy, pull the thermistor out and test. (possibly replace thermisitor)
If it's not noisy, move the hotend around with the steppers off and see if it gets noisy with motion. go back to 2
If it's still not noisy, it's definitely EMF from the steppers, and you'll need to replace the wire to the sensor. ideally with shielded wire and try not to run it along the same path as the stepper wires.