PID autotune failed! Bad extruder number
April 27, 2017 03:06AM
I cannot run the pid autotune for my bed. I have tried uploading different version of marlin but still getting the same error. For PID autotune i entered M303 E-1 S90 C8. please advice

Edited 2 time(s). Last edit at 04/27/2017 03:17AM by rizulthkr.
Re: PID autotune failed! Bad extruder number
April 27, 2017 03:14AM
What command are you trying. What type of bed?

But since the error says "Bad extruder number" Im guessing you have the syntax wrong...
Re: PID autotune failed! Bad extruder number
April 27, 2017 03:17AM
M303 E-1 S90 C8
Re: PID autotune failed! Bad extruder number
April 27, 2017 03:36AM
In your configuration.h is #define PIDTEMPBED set?
(ie no // in front of it)
Re: PID autotune failed! Bad extruder number
April 27, 2017 04:03AM
yes its un commented . i.e there is no // in front of it
Re: PID autotune failed! Bad extruder number
April 27, 2017 04:13AM
does you bed read room temperature when at room temp? (or close enough)
Re: PID autotune failed! Bad extruder number
April 27, 2017 04:51AM
yes extruder and Bed have the same reading
Re: PID autotune failed! Bad extruder number
April 27, 2017 05:21AM
In that case double check the assigned pins for the Bed and Extruder thermistors


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Re: PID autotune failed! Bad extruder number
March 12, 2019 07:55PM
I finally got it to work, you have to heat your bed withing 10 degrees of your target temperature then run the pid autotune, then it will work, as long as you have the pid autotune enabled in your marlin code and that other option below it commented out you are good to go, try that and let me know if it worked for you, if you haven't already figured it out.
Re: PID autotune failed! Bad extruder number
March 30, 2019 04:18PM
I don't think I ever had to preheat my bed when autotuning. There is a timeout, so if your bed is very slow heating that might be why it's failing. A better solution might be to set the timeout value to something larger.


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Re: PID autotune failed! Bad extruder number
April 25, 2022 08:38AM
I can't find a solution to this

Edited 2 time(s). Last edit at 04/25/2022 08:52AM by Plizze.
Re: PID autotune failed! Bad extruder number
April 26, 2022 09:46AM
You could do M503 to see what it thinks is there.
Otherwise it seems its either a miss configuration or M303 E-1 S90 C8 is not exactly what its getting. Is it getting the "-" as a negative symbol or a dash? Any weird keyboard translation errors ?
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