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Print cooling fan not coming on

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  • undefined
    Cinpro
    last edited by 30 Nov 2017, 23:52

    I am able to turn the print cooling fan on manually in the DWC, but its not turning on by itself at layer 3 like it should. I'm reinstalling my slicer now. is there anything the Firmware that could contribute to this? should I reinstall it if reinstalling my slicer doesn't do the trick?The tech support from S3D just give canned answers that don't really fit the problem.

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    • undefined
      bot
      last edited by 1 Dec 2017, 00:06

      Some fans require a minimum voltage (PWM value) to start spinning. Sometimes, you can then lower the speed a bit afterwards, they just need a boost to get started spinning.

      EG, my print fans won't turn on below about 30% power.

      *not actually a robot

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      • undefined
        Cinpro
        last edited by 1 Dec 2017, 02:29

        this was working fine, now it hit or miss as to whether they will turn on or not.

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        • undefined
          dc42 administrators
          last edited by 1 Dec 2017, 08:41

          Here are some reasons why the print cooling fan might not be coming on:

          1. Bad connection in the wiring. It might be OK in some head positions and not ok in others.

          2. If the slicer is commanding the fan to turn on at less than full speed, you might need to change the PWM frequency. Lower frequency may help. Or you may need to use a longer blip time. Both of these are parameters in the M106 command. Some fans just don't like PWM.

          3. If your printer is a delta with magnetic arm joints, some fans don't work properly in the presence of the magnetic fields from the joints.

          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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          • undefined
            Cinpro
            last edited by 2 Dec 2017, 17:57

            1. all new wiring and I have already replaced the connectors
            2. I have the blip to full speed enabled, however I can still turn the fan on @ 3% manually in the DWC and it comes on. it doesn't even show that it should be on in the DWC, BOTH are at 0. its like it never got the command.
            3. CoreXY

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            • undefined
              deckingman
              last edited by 12 Feb 2017, 19:31 2 Dec 2017, 19:28

              If you can turn it "manually" through DWC then logic would dictate that the slicer isn't putting the M106 command in the file (or that it is putting M106 but with other parameters which prevent the fan from running). In your OP you state that the fan ought to come on at layer 3, so take a look at the gcode file and see if there is an M106 soon after the G1 Znnn (where nnn corresponds to the height for layer 3). If the M106 command is there, what comes after it? Full speed would be M106 S255.

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

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              • undefined
                Cinpro
                last edited by 2 Dec 2017, 22:09

                G1 E-8.1000 F3000
                G1 Z1.469 F1800
                ; layer 3, Z = 0.469
                M106 S255
                G4 P500
                M106 S71
                M105

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                • undefined
                  Cinpro
                  last edited by 3 Dec 2017, 01:16

                  just an FYI does the same thing when I use Slic3r, will check out hardware tomorrow if time allows.

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                  • undefined
                    dc42 administrators
                    last edited by 3 Dec 2017, 09:17

                    Do those same commands (M106 S255, wait half a second, then M106 S71) work when you send them manually, with the same tool selected?

                    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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                    • undefined
                      Cinpro
                      last edited by 3 Dec 2017, 14:49

                      typing those into the G-code window does not get the fan to move, the fan slider still does

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                      • undefined
                        dc42 administrators
                        last edited by 3 Dec 2017, 15:54

                        @Cinpro:

                        typing those into the G-code window does not get the fan to move, the fan slider still does

                        Are you certain that you have a tool selected (type T by itself to check), and that the fan mapping for that tool is correct (type M563 P# to check, where # is the tool number)?

                        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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                        • undefined
                          Cinpro
                          last edited by 3 Dec 2017, 16:11

                          M563 P0
                          Tool 0 - drives: 0; heaters (active/standby temps): 1 (0.0/0.0); xmap: X; ymap: Y; fans: 0; status: selected

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                          • undefined
                            dc42 administrators
                            last edited by 3 Dec 2017, 16:16

                            Which fan connector do you have the print cooling fan connected to? With that configuration, it should be fan 0.

                            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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                            • undefined
                              Cinpro
                              last edited by 3 Dec 2017, 16:19

                              I think I got it, it is mapped to fan 0, but I only had fan 2 available for PWM. I got a new board so I have have this one repaired (have to find someone, my hands shake too badly) when I swapped everything to the new board I put all the fans exactly where they were. so fan 0 got triggered, but since it wasn't there, no cooling fan. in future if I have a problem with a fan o can I map the firmware to tell it to use say fan 1 or fan 2? and one for the suggestion box, make the fans match in the firmware and the DWC having 0,1,2 and 1,2,3 is annoying.

                              going to do a test print now to verify this, but the g-code you gave me earlier seems to work. thanks 😄

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                              • undefined
                                dc42 administrators
                                last edited by 3 Dec 2017, 16:43

                                If you add parameter F2 to your M563 P0 command, then fan 0 will be mapped to fan 2 when tool 0 is selected.

                                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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                                • undefined
                                  Cinpro
                                  last edited by 3 Dec 2017, 16:49

                                  grr thats not it! 😞

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                                  • undefined
                                    Cinpro
                                    last edited by 3 Dec 2017, 16:59

                                    M106 P0 S0 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
                                    M106 P1 S0 I0 F500 H-1 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off
                                    M106 P2 S0 I0 F255 H-1 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned off

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                                    • undefined
                                      dc42 administrators
                                      last edited by 3 Dec 2017, 18:06

                                      Which fan connector do you have your print cooling fan connected to at present?

                                      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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                                      • undefined
                                        Cinpro
                                        last edited by 3 Dec 2017, 18:28

                                        fan0

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