Extremal hotend temperature noise

General Discussion
21

I seem to have overcome the temperature problem. Once again I connected the sensor directly - the problem disappeared.
I connected it back in the usual way and everything worked - the error was within half a degree.

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22

Not to sound brash but did you read the reviews for the T-D500 from Trianglelab? Last I checked the reviews on Ali, people had nothing but problems getting that thermister working properly with Klipper, so this isnā€™t just you more than likely. I donā€™t think that sensor is even in Klipper without defining a custom thermister

23

My printer was originally equipped with this thermistor. There were no problems on the marlin.
Judging by my measurements at temperatures above 100C, it shows quite accurately.

I also found the configuration on the Klipper without any problems

My Trianglelab T-D500 Klipper config

[thermistor D500]

temperature1: 100
resistance1: 147700

temperature2: 200
resistance2: 8000

temperature3: 450
resistance3: 146.9
24

Correction: ā€œThere were no reported problems on the marlin.ā€

Iā€™m sure youā€™re feeling quite beat up and not that confident in Klipper but thereā€™s a hardware issue here. It could be the thermistor (as @nathan22211 reported), it could be wires that are breaking internally or it could be something like a noisy or poorly output filtered power supply (which I was wondering about originally).

Question, when you were using Marlin, were you using the firmware that came with the printer? If it was, then I would be very suspicious if that was the case as the manufacturerā€™s version of the firmware may have been altered to mask the thermistor instability when the toolhead is moving.

I believe your printer has a Robin Nano V3 board (Iā€™m very familiar with that). Could I ask you to find a cheap NTC 100k 3950 thermistor and mount it on your toolhead and wire it to the unused thermistor input (the connector is marked ā€œTH2ā€ on the board and is wired to pin PA2) and run the printer?

Doing that should help clear up this impass.

25

Now the problem has disappeared - I printed the part and throughout the printing process I did not see deviations of more than a couple of degrees when the airflow was turned on.
It was probably a problem with one of the contacts. Without blowing, deviations did not exceed 0.5C

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26

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