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Jerky movements, again

Scheduled Pinned Locked Moved
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  • undefined
    roboduet
    last edited by 21 Nov 2016, 11:04

    No updates? Maybe I can help testing/diagnosing this issue?

    1 Reply Last reply Reply Quote 0
    • undefined
      roboduet
      last edited by 27 Nov 2016, 09:55

      It seems that everyone (including David and Tony) ignores me, but I still continue my research.

      I just prepared test g-code that you can run without printing something. Code just moves effector around 100 mm circle:

      [[language]]
      T0
      G21 ; set units to millimeters
      G90 ; use absolute coordinates
      M83 ; use relative distances for extrusion
      G1 Z10.300 F4800.000
      G1 X-49.744 Y1.647 F960.000
      G1 X-49.771 Y-0.000
      G1 X-49.743 Y-1.672
      G1 X-49.659 Y-3.342
      G1 X-49.519 Y-5.009
      G1 X-49.323 Y-6.670
      G1 X-49.071 Y-8.323
      G1 X-48.763 Y-9.967
      G1 X-48.401 Y-11.599
      G1 X-47.984 Y-13.219
      G1 X-47.513 Y-14.824
      G1 X-46.988 Y-16.411
      G1 X-46.410 Y-17.981
      G1 X-45.780 Y-19.530
      G1 X-45.098 Y-21.057
      G1 X-44.365 Y-22.560
      G1 X-43.582 Y-24.038
      G1 X-42.750 Y-25.489
      G1 X-41.870 Y-26.910
      G1 X-40.928 Y-28.322
      G1 X-39.968 Y-29.661
      G1 X-38.949 Y-30.987
      G1 X-37.886 Y-32.279
      G1 X-36.781 Y-33.533
      G1 X-35.633 Y-34.750
      G1 X-34.446 Y-35.928
      G1 X-33.219 Y-37.065
      G1 X-31.956 Y-38.160
      G1 X-30.656 Y-39.212
      G1 X-29.321 Y-40.220
      G1 X-27.953 Y-41.182
      G1 X-26.554 Y-42.098
      G1 X-25.125 Y-42.966
      G1 X-23.667 Y-43.786
      G1 X-22.183 Y-44.557
      G1 X-20.674 Y-45.277
      G1 X-19.141 Y-45.946
      G1 X-17.587 Y-46.563
      G1 X-15.989 Y-47.136
      G1 X-14.420 Y-47.639
      G1 X-12.812 Y-48.097
      G1 X-11.189 Y-48.500
      G1 X-9.553 Y-48.849
      G1 X-7.907 Y-49.142
      G1 X-6.252 Y-49.380
      G1 X-4.589 Y-49.563
      G1 X-2.922 Y-49.689
      G1 X-1.251 Y-49.759
      G1 X0.447 Y-49.773
      G1 X2.093 Y-49.731
      G1 X3.763 Y-49.633 F960.000
      G1 X5.428 Y-49.479
      G1 X7.112 Y-49.264
      G1 X8.738 Y-49.003
      G1 X10.380 Y-48.681
      G1 X12.009 Y-48.305
      G1 X13.625 Y-47.875
      G1 X15.226 Y-47.390
      G1 X16.809 Y-46.852
      G1 X18.374 Y-46.261
      G1 X19.917 Y-45.618
      G1 X21.439 Y-44.923
      G1 X22.936 Y-44.178
      G1 X24.407 Y-43.382
      G1 X25.850 Y-42.538
      G1 X27.265 Y-41.646
      G1 X28.648 Y-40.707
      G1 X30.000 Y-39.721
      G1 X31.317 Y-38.691
      G1 X32.599 Y-37.617
      G1 X33.863 Y-36.484
      G1 X35.052 Y-35.344
      G1 X36.219 Y-34.146
      G1 X37.362 Y-32.891
      G1 X38.430 Y-31.637
      G1 X39.471 Y-30.329
      G1 X40.468 Y-28.986
      G1 X41.419 Y-27.610
      G1 X42.323 Y-26.203
      G1 X43.179 Y-24.767
      G1 X43.987 Y-23.302
      G1 X44.745 Y-21.812
      G1 X45.453 Y-20.296
      G1 X46.118 Y-18.735
      G1 X46.713 Y-17.199
      G1 X47.264 Y-15.620
      G1 X47.762 Y-14.023
      G1 X48.206 Y-12.411
      G1 X48.596 Y-10.785
      G1 X48.931 Y-9.146
      G1 X49.211 Y-7.497
      G1 X49.435 Y-5.840
      G1 X49.603 Y-4.176
      G1 X49.715 Y-2.508
      G1 X49.771 Y-0.836
      G1 X49.771 Y0.836
      G1 X49.715 Y2.508
      G1 X49.603 Y4.176
      G1 X49.435 Y5.840
      G1 X49.211 Y7.497
      G1 X48.931 Y9.146
      G1 X48.596 Y10.785
      G1 X48.206 Y12.411
      G1 X47.762 Y14.023
      G1 X47.264 Y15.620
      G1 X46.713 Y17.199
      G1 X46.109 Y18.758
      G1 X45.453 Y20.296
      G1 X44.745 Y21.812
      G1 X43.987 Y23.302
      G1 X43.179 Y24.767
      G1 X42.323 Y26.203
      G1 X41.419 Y27.610
      G1 X40.468 Y28.986
      G1 X39.471 Y30.329
      G1 X38.430 Y31.637
      G1 X37.346 Y32.911
      G1 X36.219 Y34.146
      G1 X35.052 Y35.344
      G1 X33.845 Y36.501
      G1 X32.599 Y37.617
      G1 X31.317 Y38.691
      G1 X30.000 Y39.721
      G1 X28.648 Y40.707
      G1 X27.265 Y41.646
      G1 X25.850 Y42.538
      G1 X24.407 Y43.382
      G1 X22.936 Y44.178
      G1 X21.439 Y44.923
      G1 X19.917 Y45.618
      G1 X18.374 Y46.261
      G1 X16.809 Y46.852
      G1 X15.226 Y47.390
      G1 X13.625 Y47.875
      G1 X12.009 Y48.305
      G1 X10.380 Y48.681
      G1 X8.714 Y49.007
      G1 X7.087 Y49.268
      G1 X5.428 Y49.479
      G1 X3.763 Y49.633
      G1 X2.093 Y49.731
      G1 X0.422 Y49.773
      G1 X-1.251 Y49.759
      G1 X-2.922 Y49.689
      G1 X-4.589 Y49.563
      G1 X-6.252 Y49.380
      G1 X-7.907 Y49.142
      G1 X-9.553 Y48.849
      G1 X-11.189 Y48.500
      G1 X-12.812 Y48.097
      G1 X-14.420 Y47.639
      G1 X-16.013 Y47.128
      G1 X-17.587 Y46.563
      G1 X-19.141 Y45.946
      G1 X-20.674 Y45.277
      G1 X-22.205 Y44.545
      G1 X-23.667 Y43.786
      G1 X-25.125 Y42.966
      G1 X-26.575 Y42.084
      G1 X-27.953 Y41.182
      G1 X-29.321 Y40.220
      G1 X-30.656 Y39.212
      G1 X-31.956 Y38.160
      G1 X-33.219 Y37.065
      G1 X-34.464 Y35.910
      G1 X-35.633 Y34.750
      G1 X-36.781 Y33.533
      G1 X-37.886 Y32.279
      G1 X-38.949 Y30.987
      G1 X-39.968 Y29.661
      G1 X-40.942 Y28.302
      G1 X-41.870 Y26.910
      G1 X-42.750 Y25.489
      G1 X-43.594 Y24.016
      G1 X-44.365 Y22.560
      G1 X-45.098 Y21.057
      G1 X-45.780 Y19.530
      G1 X-46.410 Y17.981
      G1 X-46.988 Y16.411
      G1 X-47.513 Y14.824
      G1 X-47.984 Y13.219
      G1 X-48.406 Y11.575
      G1 X-48.763 Y9.967
      G1 X-49.071 Y8.323
      G1 X-49.326 Y6.645
      G1 X-49.519 Y5.009
      G1 X-49.659 Y3.342
      G1 X-49.699 Y2.542

      This code produces jerky movements with [c]M350 X16 Y16 Z16 E16 I1[/c] command (1/16 microstepping with interpolation) and very smooth movements with [c]M350 X256 Y256 Z256 E16 I1[/c]

      I can record video to prove my words.

      1 Reply Last reply Reply Quote 0
      • undefined
        dc42 administrators
        last edited by 27 Nov 2016, 18:52

        Thanks for your example. My printers are out of action until my office refurbishment is complete, but I'll try it out when I can. Feel free to remind me on Wednesday if you don't get a response before then.

        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 0
        • undefined
          bot
          last edited by 27 Nov 2016, 18:55

          What happens when you do the exact same gcode with M350 X16 Y16 Z16 E16 I0 ?

          *not actually a robot

          1 Reply Last reply Reply Quote 0
          • undefined
            dc42 administrators
            last edited by 27 Nov 2016, 19:03

            One other question: what motor current have you set in your M906 command?

            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 0
            • undefined
              roboduet
              last edited by 27 Nov 2016, 21:05

              @bot:

              What happens when you do the exact same gcode with M350 X16 Y16 Z16 E16 I0 ?

              The same thing, but motors are very loud in this mode (relative to interpolated I1), so clicking noise is less audible over steppers noise.

              @dc42:

              One other question: what motor current have you set in your M906 command?

              Thank you, now I'm not alone 🙂

              I'm using [c]M906 X1500 Y1500 Z1500 E1000 I60[/c] with Wantai 42BYGHW811 motors. 200 steps/rev, 2.5A rated current, 1.8 mH phase inductance according to datasheet. Also I'm using 12V 30A LED power supply.

              I have tried also 1.9 A and 1.0 A motor current, nothing changed.

              Also I recorded both videos, my phone touches one of delta towers to amplify possible noise. I hope you can listen difference.
              UPD: click frequency on first video is about 5-10 hertz. Clicks appear while effector moves around circle. But there is no clicks while effector goes down or while straight movement (from center to start of circle).

              https://youtu.be/goGnxBhvC18
              https://youtu.be/aJOKRfh4D1c

              1 Reply Last reply Reply Quote 0
              • undefined
                roboduet
                last edited by 28 Nov 2016, 12:26

                Yet another video, I put my phone directly on moving caret to record better sound.

                https://youtu.be/ljaSBse_A9g

                1 Reply Last reply Reply Quote 0
                • undefined
                  deckingman
                  last edited by 28 Nov 2016, 13:02

                  Seems like I need to go to Specsavers. What are we supposed to be looking at? Have you actually tried printing anything and if so, is the printed object misshapen?

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

                  1 Reply Last reply Reply Quote 0
                  • undefined
                    roboduet
                    last edited by 28 Nov 2016, 13:08

                    I'm just want to say that something wrong : ) I'm not experiencing any real problems with printing using Duet WiFi, I'm happy Duet WiFi owner, but this is something abnormal.

                    Yes, this clicking pattern is slightly visible on printed objects, but I'm unable take good quality photo to show this. And this almost does not affect print quality.

                    1 Reply Last reply Reply Quote 0
                    • undefined
                      deckingman
                      last edited by 28 Nov 2016, 15:21

                      I can't see any difference in the movement between the first two videos but maybe that's because I'm an old guy who wears glasses. You seem to be trying to make videos that record the sound, so are you saying that it sounds different?

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

                      1 Reply Last reply Reply Quote 0
                      • undefined
                        lignumaqua
                        last edited by 28 Nov 2016, 15:29

                        I ran roboduet's file on my Rostock Mx V2 and can confirm that there is a different sound as he describes. You can definitely hear a tick which might line up with the interpolation point. Both 128 and 256 microstep without interpolation are smooth and don't have the tick. There is perhaps a discontinuity at some point in the interpolation. I couldn’t hear this when running the same test on my CoreXY, so perhaps it's specific to deltas?

                        However, I also ran print tests and cannot see any difference in the results! So, to me at least, this appears to be of academic interest only.

                        1 Reply Last reply Reply Quote 0
                        • undefined
                          roboduet
                          last edited by 28 Nov 2016, 15:36

                          @deckingman:

                          I can't see any difference in the movement between the first two videos but maybe that's because I'm an old guy who wears glasses. You seem to be trying to make videos that record the sound, so are you saying that it sounds different?

                          Yes, that's what I want to say. English is not my native language so sometimes I cannot say what I want in few words so other people can understand me.

                          Can you hear clicking (5-10 times per second) sound on last video with black picture? This clicks are felt, if I touch a finger to the carriage. This feels like tower caret stops moving for few milliseconds and then starts moving again.

                          But there is no any clicks or other sounds then I change microstepping to 1/256. Everything else is the same - maximum jerk settings, accelerations, speed, motor currents and so on.

                          1 Reply Last reply Reply Quote 0
                          • undefined
                            roboduet
                            last edited by 28 Nov 2016, 15:43

                            @lignumaqua:

                            I ran roboduet's file on my Rostock Mx V2 and can confirm that there is a different sound as he describes.
                            However, I also ran print tests and cannot see any difference in the results! So, to me at least, this appears to be of academic interest only.

                            Thank you very much! At least this is confirmed now by other people too.

                            As about differences in print quality - I can see slight differences in external surface, but I'm sure this is absolutely not a problem for me. I can try to find macro photo friendly plastic and right lighting to take photo with differences. Also I'm not sure what is affecting print quality - true 1/256 microstepping instead of interpolated 1/16 or this clicking issue.

                            1 Reply Last reply Reply Quote 0
                            • undefined
                              dc42 administrators
                              last edited by 28 Nov 2016, 21:30

                              The interpolation is only completely accurate when the carriages are moving at constant speed, which is rarely the case on a delta printer. So my guess is that the clicking noises are produced when the drive gets the interpolation wrong, perhaps when a carriage reverses direction in the middle of a move. Dynamically varying microstepping will solve that, when I get round to implementing 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

                              1 Reply Last reply Reply Quote 0
                              • undefined
                                roboduet
                                last edited by 28 Nov 2016, 21:53

                                I hear this clicking sounds with interpolation disabled at 1/16 microstepping.

                                Also seems like I found bug, printer completely freezes (including ESP8266 web server code) then I executing this commands: [c]G28[/c] to home printer, [c]M350 X16 Y16 Z16 I0[/c] to disable interpolation (interpolation enabled in config) and then start printing file without (!) homing after executing M350 command. This is reproducible every time I enter this commands.

                                1 Reply Last reply Reply Quote 0
                                • undefined
                                  dc42 administrators
                                  last edited by 28 Nov 2016, 22:42

                                  @roboduet:

                                  I hear this clicking sounds with interpolation disabled at 1/16 microstepping.

                                  Also seems like I found bug, printer completely freezes (including ESP8266 web server code) then I executing this commands: [c]G28[/c] to home printer, [c]M350 X16 Y16 Z16 I0[/c] to disable interpolation (interpolation enabled in config) and then start printing file without (!) homing after executing M350 command. This is reproducible every time I enter this commands.

                                  I can guess what is happening. Executing M350 flags the axes as not homed, so for every move that your file asks for there will be a error message generated. The Duet will run out of message buffers, so it will no longer process status requests. Sending a pause command via USB or possibly PanelDue may still work. Or you can wait until the file finishes"printing".

                                  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 0
                                  • undefined
                                    roboduet
                                    last edited by 28 Nov 2016, 23:06

                                    @dc42:

                                    So my guess is that the clicking noises are produced when the drive gets the interpolation wrong, perhaps when a carriage reverses direction in the middle of a move.

                                    Just small note about interpolation and this clicks - linear (straight) movement of effector does not produce this clicks with interpolation enabled. At the start of first two videos effector goes down to Z = 10.3 mm at X0 and Y0 and then goes to start of circle at X-49.744 Y1.647. This straight move is without clicks.

                                    To summarize my messages:

                                    Moves with clicks: segmented (many g-codes with short straight lines) movement around circle regardless of interpolation mode at 1/16 microstepping.

                                    Moves without clicks: straight movement with any microstepping setting or segmented movement around circle with 1/256 microstepping.

                                    I will try tomorrow to create small script that produces straight segmented moves and slightly bent (extremely large radius) segmented moves to test how angle between two straight movement g-codes affects this.

                                    1 Reply Last reply Reply Quote 0
                                    • undefined
                                      roboduet
                                      last edited by 29 Nov 2016, 06:53

                                      I'm just created simple script that produces segmented (0.5 mm) straight movement from X-50 Y-50 to X50 Y50 and then goes back to X-50 Y-50 with single g-code:

                                      [[language]]
                                      T0
                                      G21 ; set units to millimeters
                                      G90 ; use absolute coordinates
                                      M83 ; use relative distances for extrusion
                                      G1 X-50 Y-50 Z10.300 F4800
                                      G1 X-49.5 Y-49.5 F960
                                      G1 X-49 Y-49
                                      G1 X-48.5 Y-48.5
                                      G1 X-48 Y-48
                                      G1 X-47.5 Y-47.5
                                      G1 X-47 Y-47
                                      G1 X-46.5 Y-46.5
                                      G1 X-46 Y-46
                                      G1 X-45.5 Y-45.5
                                      G1 X-45 Y-45
                                      G1 X-44.5 Y-44.5
                                      G1 X-44 Y-44
                                      G1 X-43.5 Y-43.5
                                      G1 X-43 Y-43
                                      G1 X-42.5 Y-42.5
                                      G1 X-42 Y-42
                                      G1 X-41.5 Y-41.5
                                      G1 X-41 Y-41
                                      G1 X-40.5 Y-40.5
                                      G1 X-40 Y-40
                                      G1 X-39.5 Y-39.5
                                      G1 X-39 Y-39
                                      G1 X-38.5 Y-38.5
                                      G1 X-38 Y-38
                                      G1 X-37.5 Y-37.5
                                      G1 X-37 Y-37
                                      G1 X-36.5 Y-36.5
                                      G1 X-36 Y-36
                                      G1 X-35.5 Y-35.5
                                      G1 X-35 Y-35
                                      G1 X-34.5 Y-34.5
                                      G1 X-34 Y-34
                                      G1 X-33.5 Y-33.5
                                      G1 X-33 Y-33
                                      G1 X-32.5 Y-32.5
                                      G1 X-32 Y-32
                                      G1 X-31.5 Y-31.5
                                      G1 X-31 Y-31
                                      G1 X-30.5 Y-30.5
                                      G1 X-30 Y-30
                                      G1 X-29.5 Y-29.5
                                      G1 X-29 Y-29
                                      G1 X-28.5 Y-28.5
                                      G1 X-28 Y-28
                                      G1 X-27.5 Y-27.5
                                      G1 X-27 Y-27
                                      G1 X-26.5 Y-26.5
                                      G1 X-26 Y-26
                                      G1 X-25.5 Y-25.5
                                      G1 X-25 Y-25
                                      G1 X-24.5 Y-24.5
                                      G1 X-24 Y-24
                                      G1 X-23.5 Y-23.5
                                      G1 X-23 Y-23
                                      G1 X-22.5 Y-22.5
                                      G1 X-22 Y-22
                                      G1 X-21.5 Y-21.5
                                      G1 X-21 Y-21
                                      G1 X-20.5 Y-20.5
                                      G1 X-20 Y-20
                                      G1 X-19.5 Y-19.5
                                      G1 X-19 Y-19
                                      G1 X-18.5 Y-18.5
                                      G1 X-18 Y-18
                                      G1 X-17.5 Y-17.5
                                      G1 X-17 Y-17
                                      G1 X-16.5 Y-16.5
                                      G1 X-16 Y-16
                                      G1 X-15.5 Y-15.5
                                      G1 X-15 Y-15
                                      G1 X-14.5 Y-14.5
                                      G1 X-14 Y-14
                                      G1 X-13.5 Y-13.5
                                      G1 X-13 Y-13
                                      G1 X-12.5 Y-12.5
                                      G1 X-12 Y-12
                                      G1 X-11.5 Y-11.5
                                      G1 X-11 Y-11
                                      G1 X-10.5 Y-10.5
                                      G1 X-10 Y-10
                                      G1 X-9.5 Y-9.5
                                      G1 X-9 Y-9
                                      G1 X-8.5 Y-8.5
                                      G1 X-8 Y-8
                                      G1 X-7.5 Y-7.5
                                      G1 X-7 Y-7
                                      G1 X-6.5 Y-6.5
                                      G1 X-6 Y-6
                                      G1 X-5.5 Y-5.5
                                      G1 X-5 Y-5
                                      G1 X-4.5 Y-4.5
                                      G1 X-4 Y-4
                                      G1 X-3.5 Y-3.5
                                      G1 X-3 Y-3
                                      G1 X-2.5 Y-2.5
                                      G1 X-2 Y-2
                                      G1 X-1.5 Y-1.5
                                      G1 X-1 Y-1
                                      G1 X-0.5 Y-0.5
                                      G1 X0 Y0
                                      G1 X0.5 Y0.5
                                      G1 X1 Y1
                                      G1 X1.5 Y1.5
                                      G1 X2 Y2
                                      G1 X2.5 Y2.5
                                      G1 X3 Y3
                                      G1 X3.5 Y3.5
                                      G1 X4 Y4
                                      G1 X4.5 Y4.5
                                      G1 X5 Y5
                                      G1 X5.5 Y5.5
                                      G1 X6 Y6
                                      G1 X6.5 Y6.5
                                      G1 X7 Y7
                                      G1 X7.5 Y7.5
                                      G1 X8 Y8
                                      G1 X8.5 Y8.5
                                      G1 X9 Y9
                                      G1 X9.5 Y9.5
                                      G1 X10 Y10
                                      G1 X10.5 Y10.5
                                      G1 X11 Y11
                                      G1 X11.5 Y11.5
                                      G1 X12 Y12
                                      G1 X12.5 Y12.5
                                      G1 X13 Y13
                                      G1 X13.5 Y13.5
                                      G1 X14 Y14
                                      G1 X14.5 Y14.5
                                      G1 X15 Y15
                                      G1 X15.5 Y15.5
                                      G1 X16 Y16
                                      G1 X16.5 Y16.5
                                      G1 X17 Y17
                                      G1 X17.5 Y17.5
                                      G1 X18 Y18
                                      G1 X18.5 Y18.5
                                      G1 X19 Y19
                                      G1 X19.5 Y19.5
                                      G1 X20 Y20
                                      G1 X20.5 Y20.5
                                      G1 X21 Y21
                                      G1 X21.5 Y21.5
                                      G1 X22 Y22
                                      G1 X22.5 Y22.5
                                      G1 X23 Y23
                                      G1 X23.5 Y23.5
                                      G1 X24 Y24
                                      G1 X24.5 Y24.5
                                      G1 X25 Y25
                                      G1 X25.5 Y25.5
                                      G1 X26 Y26
                                      G1 X26.5 Y26.5
                                      G1 X27 Y27
                                      G1 X27.5 Y27.5
                                      G1 X28 Y28
                                      G1 X28.5 Y28.5
                                      G1 X29 Y29
                                      G1 X29.5 Y29.5
                                      G1 X30 Y30
                                      G1 X30.5 Y30.5
                                      G1 X31 Y31
                                      G1 X31.5 Y31.5
                                      G1 X32 Y32
                                      G1 X32.5 Y32.5
                                      G1 X33 Y33
                                      G1 X33.5 Y33.5
                                      G1 X34 Y34
                                      G1 X34.5 Y34.5
                                      G1 X35 Y35
                                      G1 X35.5 Y35.5
                                      G1 X36 Y36
                                      G1 X36.5 Y36.5
                                      G1 X37 Y37
                                      G1 X37.5 Y37.5
                                      G1 X38 Y38
                                      G1 X38.5 Y38.5
                                      G1 X39 Y39
                                      G1 X39.5 Y39.5
                                      G1 X40 Y40
                                      G1 X40.5 Y40.5
                                      G1 X41 Y41
                                      G1 X41.5 Y41.5
                                      G1 X42 Y42
                                      G1 X42.5 Y42.5
                                      G1 X43 Y43
                                      G1 X43.5 Y43.5
                                      G1 X44 Y44
                                      G1 X44.5 Y44.5
                                      G1 X45 Y45
                                      G1 X45.5 Y45.5
                                      G1 X46 Y46
                                      G1 X46.5 Y46.5
                                      G1 X47 Y47
                                      G1 X47.5 Y47.5
                                      G1 X48 Y48
                                      G1 X48.5 Y48.5
                                      G1 X49 Y49
                                      G1 X49.5 Y49.5
                                      G1 X-50 Y-50

                                      Update: also click frequency directly depends on frequency of g-codes, seems like this clicks going between g-code commands. Maybe something like fill of next command queue or read-ahead of g-codes freezing movements?

                                      Example of low-frequency clicks with longer segments:

                                      [[language]]
                                      T0
                                      G21 ; set units to millimeters
                                      G90 ; use absolute coordinates
                                      M83 ; use relative distances for extrusion
                                      G1 X-50 Y-50 Z10.300 F4800.000
                                      G1 X-50 Y-50 F960
                                      G1 X-45 Y-45
                                      G1 X-40 Y-40
                                      G1 X-35 Y-35
                                      G1 X-30 Y-30
                                      G1 X-25 Y-25
                                      G1 X-20 Y-20
                                      G1 X-15 Y-15
                                      G1 X-10 Y-10
                                      G1 X-5 Y-5
                                      G1 X0 Y0
                                      G1 X5 Y5
                                      G1 X10 Y10
                                      G1 X15 Y15
                                      G1 X20 Y20
                                      G1 X25 Y25
                                      G1 X30 Y30
                                      G1 X35 Y35
                                      G1 X40 Y40
                                      G1 X45 Y45

                                      Now I'm sure that this clicks are result of a lot of g-code fragments. David, I think that something wrong.

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                                      • undefined
                                        roboduet
                                        last edited by 3 Dec 2016, 18:23

                                        @dc42:

                                        Thanks for your example. My printers are out of action until my office refurbishment is complete, but I'll try it out when I can. Feel free to remind me on Wednesday if you don't get a response before then.

                                        David, did you have time to check this? It seems to me that RRF produces very small pauses after each g-code, this pauses causes jerky moves. Even linear (straight?) movement of effector on my delta produces this pauses. You can view example g-codes in my previous post. But 1-line (w/o segments) g-code does not produce this pauses.

                                        Now I can hear this pauses almost in every print with smooth curved movements 🙂

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                                        • undefined
                                          bot
                                          last edited by 5 Dec 2016, 18:49

                                          I think if I listen very carefully to my delta running a 0.8.5 I can hear similar sounds. Can you post photos of the surface defects it creates on the sides of the print? I'm sorry if you posted this already and I missed it.

                                          *not actually a robot

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