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    Question about fan control..

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    • deckingmanundefined
      deckingman
      last edited by

      Fans are optional so you need to add them to config.g if you want to use one. Having said that, the wiki extract you posted says this:

      "We recommend you use the FAN1 connector for a thermostatically-controlled hot end fan, because on the Duet WiFi it defaults to being on at power up, to provide maximum safety if you restart your Duet when the hot end is hot."

      Which is why your extruder fan works without putting a M106 P1 command in config.g. If you want to use a part cooling fan and if you connect it to the Fan0 connector, then you need to put an M106 P0 command in config.g.

      Ian
      https://somei3deas.wordpress.com/
      https://www.youtube.com/@deckingman

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      • dc42undefined
        dc42 administrators
        last edited by

        The part cooling fan should work (i.e. respond to M106 commands generated by your slicer), at full speed at least, without any support in config.g if you have connected it to Fan 0. What might not work is turning it on at less than full speed, because you may have to reduce the PWM frequency or increase the blip time using a M106 command in config.g.

        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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        • vbtalentundefined
          vbtalent
          last edited by

          For me the part fan on Fan0 does not come on unless I put in the M106 in the config.g however the extruder Fan1 is working as described.

          In Slic3r there is a "Filament Setting" for "Cooling" which generates Gcode similar to the following

          [c]…
          M106 S219.3
          M106 S140.25
          ...[/c]

          if I use the following in my config.g file

          [c]M106 P0 S1 I0 F500 H1 T45[/c]

          I assume the Gcode lines from Slic3r will be interpreted and the Fan0 speed will be controlled as it prints and override the default settings in the config.g file?

          Thanks for the input guys.

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          • dc42undefined
            dc42 administrators
            last edited by

            The S1 in your M106 command means turn on the fan at full speed. The H1 means control it thermostatically with the hot end temperature, which you probably don't want for the part fan, because it's normally best to print the first layer without the part fan running.

            The M106 command in config.g should not be needed. Without it, the fan will be off until a M106 command generated by the slicer turns it on after the first layer, which is almost certainly the behaviour you need.

            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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            • deckingmanundefined
              deckingman
              last edited by

              Whilst I think that the Wiki could be a little clearer in what needs to go in config.g and what doesn't, I can confirm that deleting M106 P0 from config.g has no effect on the print fan.

              What may be confusing the OP however, is that in the web interface, the (print) fan is labelled "FAN1" not "FAN0" as might be expected.

              Ian
              https://somei3deas.wordpress.com/
              https://www.youtube.com/@deckingman

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              • dc42undefined
                dc42 administrators
                last edited by

                @deckingman:

                What may be confusing the OP however, is that in the web interface, the (print) fan is labelled "FAN1" not "FAN0" as might be expected.

                Good point! I'll suggest to chrishamm that he changes it.

                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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                • deckingmanundefined
                  deckingman
                  last edited by

                  @dc42:

                  @deckingman:

                  What may be confusing the OP however, is that in the web interface, the (print) fan is labelled "FAN1" not "FAN0" as might be expected.

                  Good point! I'll suggest to chrishamm that he changes it.

                  While you are on, how about getting my pet hate fixed? That is extruder drives being labelled 1 to 5 instead of 0 to 4 πŸ™‚

                  i.e. assigning drives 0 to 4 to tools 0 to 4 but to check extrusion heat tool 2 but use drive 3. Grrrrrrr πŸ™‚

                  Ian
                  https://somei3deas.wordpress.com/
                  https://www.youtube.com/@deckingman

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                  • dc42undefined
                    dc42 administrators
                    last edited by

                    @deckingman:

                    @dc42:

                    @deckingman:

                    What may be confusing the OP however, is that in the web interface, the (print) fan is labelled "FAN1" not "FAN0" as might be expected.

                    Good point! I'll suggest to chrishamm that he changes it.

                    While you are on, how about getting my pet hate fixed? That is extruder drives being labelled 1 to 5 instead of 0 to 4 πŸ™‚

                    i.e. assigning drives 0 to 4 to tools 0 to 4 but to check extrusion heat tool 2 but use drive 3. Grrrrrrr πŸ™‚

                    Where are the extruder drives labelled 1 to 5?

                    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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                    • deckingmanundefined
                      deckingman
                      last edited by

                      @dc42:

                      Where are the extruder drives labelled 1 to 5?

                      DWC - Machine Control page - under "Extruder control" and just above "Miscellaneous" (which also shows "Fan1") πŸ™‚

                      Ian
                      https://somei3deas.wordpress.com/
                      https://www.youtube.com/@deckingman

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                      • deckingmanundefined
                        deckingman
                        last edited by

                        Also in print status under "Extrusion factors" they are labelled as Extruder 1, Extruder 2 etc. For the majority of people who only use a single extruder, they will only see one extruder (or drive depending on which page you are on) so it won't matter. It's only crazy people like me who have mixing hot ends that have the issue.

                        Cheers

                        Ian
                        https://somei3deas.wordpress.com/
                        https://www.youtube.com/@deckingman

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                        • vbtalentundefined
                          vbtalent
                          last edited by

                          OK, great!

                          Thanks for the direction… Slicer controls fan in G-Code... M106 not required in config.g.

                          Sorry about the additional work, lol!

                          VB,

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