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    Duet-Wifi Fans won't turn off

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    Duet Hardware and wiring
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    • kraegarundefined
      kraegar
      last edited by

      Simplify3d has the ability to run post processing scripts on your gcode.

      Co-Creator of the RailcoreII CoreXY printer
      https://www.thingiverse.com/thing:2407174

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      • kraegarundefined
        kraegar
        last edited by

        So I got this: https://amzn.com/B01J78FX9S

        Thinking I could connect it to 12v in, and run the 12v out to the motor, and connect the fan control to the signal / ground on it.

        Unfortunately, it's always on when connected that way. Anyone know if I can use a PWM controller like this to accomplish what I'm trying to do?

        Co-Creator of the RailcoreII CoreXY printer
        https://www.thingiverse.com/thing:2407174

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        • deckingmanundefined
          deckingman
          last edited by

          @peridot:

          @kraegar:

          Alright. I've scripted it in my slicer to control P1, so no biggie.

          Can I ask which slicer you used for this? I can't figure out how to make slic3r's fan control control anything but the first fan.

          You can run scripts from Slic3R but that's a bit complex for this task. What I would do is slice as normal then just use a simple search and replace using notepad++ to change the P0 commands to P1.

          HTH

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

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          • kraegarundefined
            kraegar
            last edited by

            In s3d the "script" is:

            {REPLACE "M106" "M106 P1"}

            Co-Creator of the RailcoreII CoreXY printer
            https://www.thingiverse.com/thing:2407174

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            • botundefined
              bot
              last edited by

              @kraegar:

              In s3d the "script" is:

              {REPLACE "M106" "M106 P1"}

              In S3D, if you go to Tools>Firmware Configuration>FFF you will be given some fields to alter what the fan on and off commands are. Presumably, you could add the P1 thing there, but I've never tried it.

              *not actually a robot

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              • kraegarundefined
                kraegar
                last edited by

                Ah, nice, that's even easier. Thanks!

                Co-Creator of the RailcoreII CoreXY printer
                https://www.thingiverse.com/thing:2407174

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                • elmoretundefined
                  elmoret
                  last edited by

                  @kraegar:

                  So I got this: https://amzn.com/B01J78FX9S

                  Thinking I could connect it to 12v in, and run the 12v out to the motor, and connect the fan control to the signal / ground on it.

                  Unfortunately, it's always on when connected that way. Anyone know if I can use a PWM controller like this to accomplish what I'm trying to do?

                  It looks like that expects the PWM on the high side, not the low side. The Duet switches the low side.

                  I think you could attach a ~10k resistor between the fan terminals, run - from the fan to the + input of the board you bought and - from the power supply to the - input of the board you bought, but I'd have dc42 confirm that before proceeding.

                  You'd also need to invert the PWM signal in firmware/g-code if you do that.

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                  • kraegarundefined
                    kraegar
                    last edited by

                    Yeah, I ordered a different board. I have a workable solution in place for now.

                    Co-Creator of the RailcoreII CoreXY printer
                    https://www.thingiverse.com/thing:2407174

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                    • Qdeathstarundefined
                      Qdeathstar
                      last edited by

                      Sadly, I too have lost the ablitty to turn off P0 because of the berdAir fan….. Worked fine on the RAMBO board i was using, but not on the duet. I know DC42 said that fan mapping is supported using "F parameter" on the M563 command, so would it be something like:

                      ;M563 P0 D0 H1 //default setting, P0 mosfet damaged, so:
                      M563 P2 D0 H1 //use P2 output instead

                      now, Heater one is using fan 2 as the part fan? And, would an SSR be an appropriate way to drive the fan?

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                      • T3P3Tonyundefined
                        T3P3Tony administrators
                        last edited by

                        The way to map the fan to a specific tool:

                        http://reprap.org/wiki/G-code#M563:_Define_or_remove_a_tool

                        Is with the specific "F" command.

                        So for tool 0 but with fan 2:

                        M563 P0 D0 H1 F2

                        www.duet3d.com

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                        • Qdeathstarundefined
                          Qdeathstar
                          last edited by

                          Oh, makes sense now…

                          Is there any compelling reason to fix the f0 mosfet if I'm not using than many fans?

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                          • T3P3Tonyundefined
                            T3P3Tony administrators
                            last edited by

                            As long as it's not failed in a way that means it is getting hot or causing a short on the board that makes the board misbehave then no need.

                            www.duet3d.com

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                            • kraegarundefined
                              kraegar
                              last edited by

                              FYI - it's crazy overkill for this use, but this is what I ended up using: http://a.co/hpcQl1r

                              Lets me drive the air pump with PWM, works great, and absolutely can handle the draw. A bit spendy compared to other options.

                              I may actually pick up another for my bed, though. Works great.

                              Co-Creator of the RailcoreII CoreXY printer
                              https://www.thingiverse.com/thing:2407174

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                              • Qdeathstarundefined
                                Qdeathstar
                                last edited by

                                I just got an SSR, workes fine. But, Mhackney posted that as a suggestion for me to use as well, but specifically recommended against using that for a heated bed, since they fail in the ON postion which might cause a fire.

                                He recommends this:

                                http://www.auberins.com/index.php?main_page=product_info&cPath=2_30&products_id=288

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                                • kraegarundefined
                                  kraegar
                                  last edited by

                                  Interesting note, thanks.

                                  Co-Creator of the RailcoreII CoreXY printer
                                  https://www.thingiverse.com/thing:2407174

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