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    Any reason for the 262 C max temp?

    Tuning and tweaking
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    • Sethipus
      Sethipus last edited by

      I was trying to print some PCMax and ePC at 270 C, but my hotend wouldn't go above 260, and I discovered reading the Wiki that after some version of Reprap firmware the default maximum is 262 C.

      I just added two M143 commands to config.g to set the max temperature of both hotends to 275 C.

      Is there any reason the max temperature was set to 262 C? That seems like an awfully specific number, so it gives me pause to just change it uninformed.

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      • dc42
        dc42 administrators last edited by

        After some discussion with others I chose 260C as a likely maximum temperature that a user would need to set when printing common filaments, then I added 2C to allow for overshoot when heating up.

        Duet WiFi hardware designer and firmware engineer
        Please do not ask me for Duet support via PM or email, use the forum
        http://www.escher3d.com, https://miscsolutions.wordpress.com

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        • zzing
          zzing last edited by

          This caused me to waste about half an hour being utterly frustrated because I couldn't get it up to 285 to change my nozzle - and nothing told me anything.

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          • iDevelo
            iDevelo last edited by

            Here's what i use for reference:

            M143 H0 S110                                      ; Set maximum temperature for bed to 110C
            M143 H1 S285                                      ; Set maximum temperature for hotend to 285C
            
            
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            • Sethipus
              Sethipus last edited by

              Thanks David for the response.

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              • dc42
                dc42 administrators last edited by

                btw the reason for having a default limit was that most hot ends don't like high temperatures, because they have either a thermistor with a temperature limit of (typically) around 270-280C or a PTFE liner.

                Duet WiFi hardware designer and firmware engineer
                Please do not ask me for Duet support via PM or email, use the forum
                http://www.escher3d.com, https://miscsolutions.wordpress.com

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                • GrodanB
                  GrodanB last edited by

                  So the fact that E3D recommend 285 for nozzle change is not useful…

                  hmm...

                  my bad...

                  P1 is not correct... H1...

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                  • Jackal
                    Jackal last edited by

                    @GrodanB:

                    So the fact that E3D recommend 285 for nozzle change is not useful…

                    I can't override?

                    Or 262 is good enough for nozzle change?

                    Read the reply a few post above

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                    • dc42
                      dc42 administrators last edited by

                      @GrodanB:

                      So the fact that E3D recommend 285 for nozzle change is not useful…

                      Can you give me a link to that? I'm quite happy to increase the default maximum temperature if that would help users.

                      Duet WiFi hardware designer and firmware engineer
                      Please do not ask me for Duet support via PM or email, use the forum
                      http://www.escher3d.com, https://miscsolutions.wordpress.com

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                      • GrodanB
                        GrodanB last edited by

                        Yes: https://wiki.e3d-online.com/wiki/E3D-v6_Documentation#Swapping

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                        • dc42
                          dc42 administrators last edited by

                          Thanks, I'll increase the default limit to 288C in the next release.

                          Duet WiFi hardware designer and firmware engineer
                          Please do not ask me for Duet support via PM or email, use the forum
                          http://www.escher3d.com, https://miscsolutions.wordpress.com

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