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    PID Issues 3.4 RC1

    Scheduled Pinned Locked Moved Unsolved
    Beta Firmware
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    • Phaedruxundefined
      Phaedrux Moderator
      last edited by

      It means it's taking 10 seconds for the sensor to register a change in temp between the time heat was requested and when it's detected. For my V6 it's closer to 2 seconds. So I wonder if there is something off with assembly causing that.

      Hence the request for photos to see what is happening or if it's an unusual design etc.

      Is the hot block in direct contact with the cold end heatsink or something? Or the heater cartridge or sensor not firmly secured?

      Z-Bot CoreXY Build | Thingiverse Profile

      Reefwarriorundefined OwenDundefined 2 Replies Last reply Reply Quote 0
      • Reefwarriorundefined
        Reefwarrior @Phaedrux
        last edited by

        @phaedrux Everything is firmly secured - did double check it 🙂

        The only thing that may be a little weird is the gap between the nozzle and the heat block, may be a tad big.... but that should not be an issue, should it?

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        • Phaedruxundefined
          Phaedrux Moderator
          last edited by

          Maybe? We're looking for anything non-standard, so...

          Z-Bot CoreXY Build | Thingiverse Profile

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          • OwenDundefined
            OwenD @Phaedrux
            last edited by OwenD

            @phaedrux
            Have you done a PID autotune with 2.4rc1 3.4rc1?
            I'm getting D values in the 10 second range with my E3D V6 as well.
            As you probably know I've been experiencing issues with wild temperature fluctuations with later releases.

            Reefwarriorundefined 1 Reply Last reply Reply Quote 1
            • Reefwarriorundefined
              Reefwarrior @OwenD
              last edited by

              @owend you mean 3.4rc1?

              OwenDundefined 1 Reply Last reply Reply Quote 0
              • OwenDundefined
                OwenD @Reefwarrior
                last edited by

                @reefwarrior Yes. My fingers are dyslexic 🙄

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                • OwenDundefined
                  OwenD
                  last edited by

                  Not wanting to hijack this thread......
                  A search reveals that in November 2021 in V3.4.0b6 , I was getting PID results of

                  M307 H1 B0 R1.594 C358.1:217.5 D6.05 S1.00 V24.3
                  

                  With same hardware in 3.4rc1

                  M307 H1 R2.848 K0.325:0.197 D10.51 E1.35 S1.00 B0 V24.3
                  

                  Different algorithm of course, but I wouldn't have thought the dead time would change that much as a result and it may explain the over shoots I now get.

                  Reefwarriorundefined 1 Reply Last reply Reply Quote 1
                  • Reefwarriorundefined
                    Reefwarrior @OwenD
                    last edited by

                    @owend I will try a different firmware version tomorrow, however 3.4 is needed to keep my mini12864 up and running. My overshoot is typically 10 to 15 degrees at the moment...

                    dc42undefined 1 Reply Last reply Reply Quote 0
                    • dc42undefined
                      dc42 administrators @Reefwarrior
                      last edited by

                      @reefwarrior said in PID Issues 3.4 RC1:

                      @owend I will try a different firmware version tomorrow, however 3.4 is needed to keep my mini12864 up and running. My overshoot is typically 10 to 15 degrees at the moment...

                      Overshoot is typically caused by the R parameter being too high. It appears to have increased significantly from earlier. Try reducing 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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                      • Reefwarriorundefined
                        Reefwarrior
                        last edited by

                        @dc42

                        WhatsApp Image 2022-02-19 at 8.09.25 AM.jpeg WhatsApp Image 2022-02-19 at 8.09.25 AM (1).jpeg WhatsApp Image 2022-02-19 at 8.09.26 AM.jpeg

                        Reefwarriorundefined 1 Reply Last reply Reply Quote 0
                        • Reefwarriorundefined
                          Reefwarrior @Reefwarrior
                          last edited by

                          Also:

                          M307 H1 R2.0 K0.545:0.322 D10.96 E1.35 S0.80 B0 V24.1 ;V3.4RC1
                          M307 H1 B0 R2.788 C90.8:60.3 D10.93 S0.80 V24.1 ;V3.3

                          Reefwarriorundefined 1 Reply Last reply Reply Quote 0
                          • Reefwarriorundefined
                            Reefwarrior @Reefwarrior
                            last edited by Reefwarrior

                            My layer 1 printed perfectly. Just after beginning on layer two, temperature exceeded by 15 degrees; and cause a heater fault.

                            Phaedruxundefined 1 Reply Last reply Reply Quote 0
                            • Phaedruxundefined
                              Phaedrux Moderator @Reefwarrior
                              last edited by

                              @reefwarrior Does the part cooling fan turn on for layer two? It seems as if the firmware is anticipating a drop in temperature from the cooling and and tries to compensate.

                              Do you have a nozzle sock to test with?

                              Also it seems like your heatsink fan may be acting to cool the hot block as well.

                              Z-Bot CoreXY Build | Thingiverse Profile

                              Reefwarriorundefined 1 Reply Last reply Reply Quote 0
                              • Reefwarriorundefined
                                Reefwarrior @Phaedrux
                                last edited by Reefwarrior

                                @phaedrux Hi. Yeah tested with a sock too. Same result. Hot end fan is isolated from heat block - there is like a round 'O' of plastic (like a divider) between the heat block and the fins.

                                Also what is the approximate time of a PID cycle with defaults? I quite frequently have 30+ minutes. I even swapped out the board this morning. Same result!

                                Reefwarriorundefined dc42undefined 2 Replies Last reply Reply Quote 0
                                • Reefwarriorundefined
                                  Reefwarrior @Reefwarrior
                                  last edited by

                                  Also changed hot end fans. No difference.

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                                  • dc42undefined
                                    dc42 administrators @Reefwarrior
                                    last edited by

                                    @reefwarrior with cooling like that and no silicone sock over the heater block, you are certain to get a big temperature drop when the part cooling fan turns on. So I suggest you add a silicone sock, then re-run heater tuning for that tool. By running it for the tool (i.e. using the T parameter in the M303 command instead of the H parameter), it will tune with the fan both on and off, and help correct for the cooling effect of the fan.

                                    Heater tuning on hot ends normally finishes fairly quickly. Heater tuning on bed heaters can take a long time, especially if the bed has high thermal mass so it cools down very slowly.

                                    If the problem persists, please post a screen shot of the hot end temperature plot in DWC, from just before the first layer ends up until the heater fault.

                                    As a last resort you can increase the allowed temperature variation using the M570 command; however if you get a temperature drop exceeding 15C when the fan turns on, that is likely to cause you extrusion problems.

                                    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

                                    Exerqtorundefined 1 Reply Last reply Reply Quote 0
                                    • Exerqtorundefined
                                      Exerqtor @dc42
                                      last edited by Exerqtor

                                      I'm a little late to the party here and i'm running 3.4.0rc2, but i just hooked up my E3D Revo and also that threw "Warning: heater behaviour was not consistent during tuning".

                                      This is my tuning results (@280°C):

                                      Warning: heater behaviour was not consistent during tuning
                                      Auto tuning heater 1 completed after 4 idle and 30 tuning cycles in 631 seconds. This heater needs the following M307 command:
                                       M307 H1 R3.954 K0.588:0.169 D2.43 E1.35 S1.00 B0 V24.7
                                      Send M500 to save this command in config-override.g
                                      

                                      Running a Duet2 Wifi v1.03, 40x10mm hotend cooling and a single 5015 for partcooling.

                                      dc42undefined 1 Reply Last reply Reply Quote 0
                                      • dc42undefined
                                        dc42 administrators @Exerqtor
                                        last edited by dc42

                                        @exerqtor my Revo is a prototype so may not be quite the same as yours, however I didn't get that warning during tuning. The M307 command resulting from tuning at 225C was:

                                        M307 H1 R4.361 K0.450:0.647 D3.16 E1.35 S1.00 B0 V24.0
                                        

                                        which is not very different from yours. The second K value will depend very much on how strong your print cooling fan is and how well it directs heat to the print and not the nozzle; so you can ignore the difference. You will probably get good results with the values you obtained.

                                        Possible causes of the "inconsistent results" message are that there was a draught affecting the printer during tuning; or that the fan speed wasn't consistent while tuning with the fan on; or that the ambient temperature was not stable.

                                        I suggest you use the 3.4.0rc2+2 binary at https://www.dropbox.com/sh/amtiizdcylnuaye/AAA4hzXFvU0RMOSDtdT37HFua?dl=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

                                        Exerqtorundefined 1 Reply Last reply Reply Quote 0
                                        • Exerqtorundefined
                                          Exerqtor @dc42
                                          last edited by Exerqtor

                                          @dc42

                                          Ok, i'll try that binary out and see if it yields an different result. Regarding the last tuning i did it with the chamber doors closed so it's not likely it was a draught, neither did i hear any drop in the fan speed, but who knows 😅

                                          Also just as a side note, i see that your M307 has 24V spot on, i've adjusted my PSU to be a little bit over at 24,6v (measured with a multimeter on the output). What's the most "correct" thing to do there when it comes to adjusting the output for a 3D printer? I come from the automotive industry and i'm used to seing higher voltages due to battery charing etc.

                                          EDIT:

                                          Tuned again with 3.4.0rc2+2 at 230°C and got this (without a warning):

                                          Auto tuning heater 1 completed after 3 idle and 10 tuning cycles in 254 seconds. This heater needs the following M307 command:
                                          M307 H1 R4.716 K0.702:0.275 D2.47 E1.35 S1.00 B0 V24.7
                                          Send M500 to save this command in config-override.g
                                          

                                          Under half the time of the first tuning, and no errors. So it might be wise to tune the Revo's somewhere bellow 250°C (the first tuning that took 631 seconds was at 280°C), unless you put some special sauce in the rc2+2 @dc42 😅

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