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    Pressure Advance Calibration

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    Tuning and tweaking
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    • dc42undefined
      dc42 administrators
      last edited by

      Yes that's a valid approach. It's on our list to add a generator of pressure advance tests scripts to reprapfirmware.org, but it hasn't happened yet.

      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

      tmitch205undefined 1 Reply Last reply Reply Quote 4
      • deckingmanundefined
        deckingman @DigitalVision
        last edited by

        @digitalvision Did you really mean extrusion rate between 5 and 100mm/s or did you mean print speed? I suspect the latter as an extrusion rate of 100mm/sec is nowhere near attainable and would relate to a print speed in the order of 5,000 mm/sec.

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

        DigitalVisionundefined 1 Reply Last reply Reply Quote 0
        • wilrikerundefined
          wilriker @DigitalVision
          last edited by

          @digitalvision Might be relevant to other trying to test: this is python2 syntax and won't run with python3.

          Manuel
          Duet 3 6HC (v0.6) with RPi 4B on a custom Cartesian
          with probably always latest firmware/DWC (incl. betas or self-compiled)
          My Tool Collection

          1 Reply Last reply Reply Quote 2
          • OBELIKSundefined
            OBELIKS
            last edited by

            So if I want to have gcode for printer with 0,0 on the corner I need to change to this?
            curr_x = 110
            curr_y = 110

            P3Steel Toolson mk2 - Duet 2 WiFi --> RatRig V-Core with Duet WiFi 1.03
            Original Prusa i3 MK3S

            wilrikerundefined 1 Reply Last reply Reply Quote 0
            • token47undefined
              token47
              last edited by

              Very very nice approach. I helped writing the marlin test generator, and I think it is useful here also, but that test generates a bunch of side-by-side lines, and the visual results are not as pleasing as this one.

              Just for reference, the marlin test is this one:

              http://marlinfw.org/tools/lin_advance/k-factor.html

              1 Reply Last reply Reply Quote 1
              • wilrikerundefined
                wilriker @OBELIKS
                last edited by wilriker

                @obeliks said in Pressure Advance Calibration:

                So if I want to have gcode for printer with 0,0 on the corner I need to change to this?
                curr_x = 110
                curr_y = 110

                Plus the one hardcoded G1 line at line 32. Not strictly necessary but this would have better been parameterized also.

                Instead I just switched my printer to having 0,0 in the bed center. I wanted to do this for a while now. 😁 Now I need to find all places to adjust macros. 😂

                Manuel
                Duet 3 6HC (v0.6) with RPi 4B on a custom Cartesian
                with probably always latest firmware/DWC (incl. betas or self-compiled)
                My Tool Collection

                1 Reply Last reply Reply Quote 0
                • OBELIKSundefined
                  OBELIKS
                  last edited by

                  Hah. Well I'll probably do the same for this test.

                  P3Steel Toolson mk2 - Duet 2 WiFi --> RatRig V-Core with Duet WiFi 1.03
                  Original Prusa i3 MK3S

                  1 Reply Last reply Reply Quote 0
                  • brunofportoundefined
                    brunofporto
                    last edited by

                    oh thanks!!!!

                    Thet is jut great 😄

                    1 Reply Last reply Reply Quote 0
                    • wilrikerundefined
                      wilriker
                      last edited by wilriker

                      Just ran the test and found a value of 0.144 best for me. But then a question formed: is PA set for the extruder or the filament? I mean do I put it into config.g or the filament's config? I think the latter but I am not sure.

                      Manuel
                      Duet 3 6HC (v0.6) with RPi 4B on a custom Cartesian
                      with probably always latest firmware/DWC (incl. betas or self-compiled)
                      My Tool Collection

                      deckingmanundefined token47undefined 2 Replies Last reply Reply Quote 0
                      • deckingmanundefined
                        deckingman @wilriker
                        last edited by

                        @wilriker It's up to you. If you find you need different values for different filaments, put it in a macro or even the start gcode. If you always use the same value, put it in config.g.

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

                        1 Reply Last reply Reply Quote 0
                        • DigitalVisionundefined
                          DigitalVision @deckingman
                          last edited by

                          Here's another example on a different printer with a different extruder. Holding the print up to the light clearly shows the inverted color gradients showing differences in extrusion volumes.
                          0_1535998086477_IMG_6349.JPG

                          @deckingman said in Pressure Advance Calibration:

                          @digitalvision Did you really mean extrusion rate between 5 and 100mm/s or did you mean print speed? I suspect the latter as an extrusion rate of 100mm/sec is nowhere near attainable and would relate to a print speed in the order of 5,000 mm/sec.

                          Yes, I meant print speed – thanks for pointing that out. The theory being that with proper pressure advance the extrusion width should remain constant independent of print speed and acceleration/deceleration.

                          @wilriker said in Pressure Advance Calibration:

                          @digitalvision Might be relevant to other trying to test: this is python2 syntax and won't run with python3.

                          Thanks – updated the script to be python 2/3 compatible. Apologies for the messy script too – this was literally a 15 minute hack.

                          @obeliks said in Pressure Advance Calibration:

                          So if I want to have gcode for printer with 0,0 on the corner I need to change to this?
                          curr_x = 110
                          curr_y = 110

                          I updated the script to allow a bed center setting.

                          OBELIKSundefined 1 Reply Last reply Reply Quote 2
                          • OBELIKSundefined
                            OBELIKS @DigitalVision
                            last edited by

                            @digitalvision Thanks.
                            Now can someone explain my stupid ass how to output the result to a file? 😊

                            P3Steel Toolson mk2 - Duet 2 WiFi --> RatRig V-Core with Duet WiFi 1.03
                            Original Prusa i3 MK3S

                            DigitalVisionundefined 1 Reply Last reply Reply Quote 2
                            • DigitalVisionundefined
                              DigitalVision @OBELIKS
                              last edited by

                              @obeliks said in Pressure Advance Calibration:

                              @digitalvision Thanks.
                              Now can someone explain my stupid ass how to output the result to a file? 😊

                              Try:

                              python advance_cal.py > advance_cal.gcode
                              
                              1 Reply Last reply Reply Quote 2
                              • token47undefined
                                token47 @wilriker
                                last edited by

                                @wilriker said in Pressure Advance Calibration:

                                Just ran the test and found a value of 0.144 best for me. But then a question formed: is PA set for the extruder or the filament? I mean do I put it into config.g or the filament's config? I think the latter but I am not sure.

                                It will vary a lot for different materials (i.e. PLA vs ABS) and may vary between different brands of the same materials even. I consider the value valid for the specific filment the test was made on and created macros to change the value when changing the filament.

                                deckingmanundefined 1 Reply Last reply Reply Quote 0
                                • OBELIKSundefined
                                  OBELIKS
                                  last edited by

                                  I will be putting it in to the filament gcode. I will also split it per nozzle, since I have "quickchange" print head.

                                  P3Steel Toolson mk2 - Duet 2 WiFi --> RatRig V-Core with Duet WiFi 1.03
                                  Original Prusa i3 MK3S

                                  1 Reply Last reply Reply Quote 0
                                  • wilrikerundefined
                                    wilriker
                                    last edited by

                                    Thanks to everyone, I decided to put it in the filament's config. 🙂

                                    Manuel
                                    Duet 3 6HC (v0.6) with RPi 4B on a custom Cartesian
                                    with probably always latest firmware/DWC (incl. betas or self-compiled)
                                    My Tool Collection

                                    1 Reply Last reply Reply Quote 0
                                    • deckingmanundefined
                                      deckingman @token47
                                      last edited by

                                      @token47 said in Pressure Advance Calibration:

                                      It will vary a lot for different materials (i.e. PLA vs ABS) and may vary between different brands of the same materials even. I consider the value valid for the specific filment the test was made on and created macros to change the value when changing the filament.

                                      Thinking about the mechanisms at work which cause pressure to build up, it's likely to depend on the viscosity of the filament if everything else (Bowden tube length, melt chamber size and nozzle diameter) remain the same. In my own experiments, I've found that print temperature can have a small effect as it changes the viscosity but I can't say that I've noticed any difference between brands of the same filament. In fact, I can't say that I've notice any difference between PETG at 220 and PLA at 195. Maybe the difference in temperature cancels out the different viscosity characteristics of the materials. I can't print ABS so cannot say if that behaves differently.

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

                                      1 Reply Last reply Reply Quote 0
                                      • wilrikerundefined
                                        wilriker
                                        last edited by

                                        This is not completely on-topic but still fits here I hope:
                                        Linear Advance and Non-Linear Extrusion. Are they mutual exclusive or can they be used complementary? If the latter what would need to be tuned first?

                                        Manuel
                                        Duet 3 6HC (v0.6) with RPi 4B on a custom Cartesian
                                        with probably always latest firmware/DWC (incl. betas or self-compiled)
                                        My Tool Collection

                                        dc42undefined 1 Reply Last reply Reply Quote 2
                                        • dc42undefined
                                          dc42 administrators @wilriker
                                          last edited by

                                          @wilriker said in Pressure Advance Calibration:

                                          This is not completely on-topic but still fits here I hope:
                                          Linear Advance and Non-Linear Extrusion. Are they mutual exclusive or can they be used complementary? If the latter what would need to be tuned first?

                                          They can both be used together. I don't think they should interact much, but if in doubt I suggest you tune nonlinear extrusion first.

                                          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

                                          1 Reply Last reply Reply Quote 1
                                          • OBELIKSundefined
                                            OBELIKS
                                            last edited by

                                            What the? Even at S0.996 I am still seeing a step between the slow and fast part. Why?

                                            P3Steel Toolson mk2 - Duet 2 WiFi --> RatRig V-Core with Duet WiFi 1.03
                                            Original Prusa i3 MK3S

                                            wilrikerundefined sunnywilson09undefined 2 Replies Last reply Reply Quote 0
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