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    Blobs after changing to Duet 2

    Scheduled Pinned Locked Moved
    Tuning and tweaking
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    • Phaedruxundefined
      Phaedrux Moderator
      last edited by

      All I can suggest at the moment would be to go through the tuning described in the pressure advance documentation link again.

      Tune your retraction first. 60mm/s for speed seems reasonable. 0.4mm seems a bit low for distance maybe.

      Don't use wipe or coasting in the slicer.

      Your acceleration and jerk values are quite low. I would increase them, as a slow layer transition or delay during a retraction could allow time for some oozing.

      M201 X750.00 Y750.00 Z200.00 E500           	          ; set accelerations (mm/s^2)
      M566 X420.00 Y420.00 Z18.00 E300            	          ; set maximum instantaneous speed changes (mm/min)
      

      Try these instead

      M201 X900 Y900 Z200.00 E3000           	        
      M566 X900 Y900 Z120.00 E3000            	       
      

      Z-Bot CoreXY Build | Thingiverse Profile

      PXP11undefined 1 Reply Last reply Reply Quote 0
      • PXP11undefined
        PXP11 @Phaedrux
        last edited by

        @Phaedrux
        How do I make the python script work then? (http://www.sternwolken.de/tmpup/3dprint/pressureadvance2.py)
        I copy it out of the browser into Notepad++
        I change the required values line 4 to 30
        Save it in a folder as "pressureadvance2.py"
        Right click in the folder and open windows powershell
        Put in "python pressureadvance2.py > pressureadvance2.gcode"
        Hit enter
        It creates pressureadvance2.gcode but the file is empty.

        What am I doing wrong???

        If i copy the modified "pressureadvance2.py" and put it directly in python it spits out some gcode but like I said earlier I get "IndentationError: unexpected indent" and the X values which are bs.

        ; layer 99, pressure advance: 0.198
        M572 D0 S0.198
        G1 X17935.000 Y142.520 E0.7982 F6000
        G1 X17940.000 Y142.520 E0.1996 F300
        G1 X17960.000 Y142.520 E0.7982 F6000
        G1 X17980.000 Y142.520 E0.7982 F6000
        G1 X17985.000 Y142.520 E0.1996 F300
        G1 X18005.000 Y142.520 E0.7982 F6000
        G1 X18025.000 Y142.520 E0.7982 F6000
        G1 X18030.000 Y142.520 E0.1996 F300
        G1 X18050.000 Y142.520 E0.7982 F6000
        G1 X18070.000 Y142.520 E0.7982 F6000
        G1 X18075.000 Y142.520 E0.1996 F300
        G1 X18095.000 Y142.520 E0.7982 F6000
        G1 X18095.000 Y143.000 E0.0192 F6000
        
        Phaedruxundefined 1 Reply Last reply Reply Quote 0
        • Phaedruxundefined
          Phaedrux Moderator @PXP11
          last edited by

          @PXP11 said in Blobs after changing to Duet 2:

          What am I doing wrong???

          I'm no python expert. I would just use the manual option to change the PA value every few layers, or to use the slicer script to have it more automated.

          Z-Bot CoreXY Build | Thingiverse Profile

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          • PXP11undefined
            PXP11 @Phaedrux
            last edited by

            @Phaedrux
            Seems to me that the PA value of around 0.06 is actually ok.
            IMG_20200202_214352.jpg

            Well I'm kind of in a dead end right now. I'll do some further testing... maybe non linear extrusion could help?

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            • Phaedruxundefined
              Phaedrux Moderator
              last edited by

              You can use a narrower range of values to get it more dialed in. Maybe between 0.04 and 0.08 in 0.005 steps.

              I don't think non-linear extrusion will be a help at this point unless you're really on the edge of pushing your volumetric rate and are getting some filament slippage from back pressure.

              But otherwise, what are the remaining print issues with a PA value of 0.06?

              Z-Bot CoreXY Build | Thingiverse Profile

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              • dc42undefined
                dc42 administrators
                last edited by

                Please provide the GCode file for the cylindrical print that shows the blobs.

                What linear advance setting were you using in Marlin?

                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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                • JamesMundefined
                  JamesM
                  last edited by

                  I thought acceleration and instantaneous speed change for the extruder should be higher for pressure advance to function properly? On my printers I have the acceleration for my extruder at 2000 and the instantaneous speed change at 1200.

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

                    @JamesM said in Blobs after changing to Duet 2:

                    I thought acceleration and instantaneous speed change for the extruder should be higher for pressure advance to function properly? On my printers I have the acceleration for my extruder at 2000 and the instantaneous speed change at 1200.

                    Yes, that's true. If the E jerk and acceleration are too low, printing acceleration will be reduced so as not to exceed them when applying pressure advance.

                    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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                    • dc42undefined
                      dc42 administrators
                      last edited by dc42

                      One other thing that might be worth trying is the jerk mode, which is the M556 M566 P parameter. Using P1 makes the jerk policy more like Marlin's jerk policy, at least when Marlin is not configured to use junction deviation.

                      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

                      PXP11undefined 1 Reply Last reply Reply Quote 0
                      • PXP11undefined
                        PXP11 @dc42
                        last edited by PXP11

                        @dc42 said in Blobs after changing to Duet 2:

                        One other thing that might be worth trying is the jerk mode, which is the M556 P parameter.

                        Am I correct in the assumption that you mean M566 ... P1, because M556 is Axis skew compensation? I was actually curios and wondered if Marlin and RepRap use different acceleration profiles. But as far as I can understand this setting (M566...P1) sort of tackles the same problem. Can I understand this setting sort of a smoothing parameter which allows some deviation from the path by foreseeing of the gcode lines?

                        So my Marlin settings where as follows:
                        Acceleration: 750 /750 /100 /500
                        Jerk: (theoretically) 42 /42 /18 /30 (XY overridden by junction deviation, E by Lin advance)
                        Junction Deviation: 0.02mm
                        S-curve acceleration: enabled
                        Linear advance: K0.056

                        I tried the higher numbers for Z and E:

                        M201 X750.00 Y750.00 Z200.00 E3000
                        M566 X600.00 Y600.00 Z240.00 E3000
                        

                        The result was only marginally improved, still bad.

                        Here is the gcode from the little cylinder: test_cylinder.gcode
                        One of the problematic retractions would be at line 1708:

                        1706 G1 X73.815 Y39.038 E0.0126
                        1707 G1 X73.423 Y39.109 E0.0126
                        *1708 G1 X73.369 Y39.116 E-0.4000 F657
                        1709 G1 X73.224 Y39.134 F657
                        1710 ; feature infill
                        1711 ; tool H0.200 W0.600
                        1712 G1 X65.834 Y32.721 F15000
                        1713 G1 E0.4000 F4800
                        1714 G1 X73.147 Y25.409 E0.4902 F1642
                        1715 G1 X73.287 Y25.426 E0.0067
                        1716 G1 X73.660 Y25.493 E0.0179
                        
                        

                        This is a retraction during wipe movement. S3D calculates the resulting move between wipe and retraction distance. In conjunction with the printing speed this gives the resulting (low) feed (E speed was set @80mm/s).This was always this way and has worked for me so far.

                        @dc42
                        Is there something similar to Junction Deviation in RRF, because you mention M566P1 is like Marlin without it?

                        dc42undefined 1 Reply Last reply Reply Quote 0
                        • dc42undefined
                          dc42 administrators @PXP11
                          last edited by dc42

                          @PXP11 said in Blobs after changing to Duet 2:

                          Am I correct in the assumption that you mean M566 ... P1

                          Yes, sorry.

                          @PXP11 said in Blobs after changing to Duet 2:

                          Is there something similar to Junction Deviation in RRF, because you mention M566P1 is like Marlin without it?

                          Not yet, but it will come. The main difference with JD is how the amount of jerk allowed varies with cornering angle.

                          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

                          Phaedruxundefined 1 Reply Last reply Reply Quote 0
                          • Phaedruxundefined
                            Phaedrux Moderator @dc42
                            last edited by Phaedrux

                            @dc42 Can you describe what the difference between M566 P1 and P0 actually is? I think I get better results with P1, but maybe I'm not clear about what it's actually doing differently.

                            https://duet3d.dozuki.com/Wiki/Gcode#Section_M566_Set_allowable_instantaneous_speed_change

                            The default jerk policy is 0, which replicates the behaviour of earlier versions of RRF (jerk is only applied between two printing moves, or between two travel moves, and only if they both involve XY movement or neither does). Changing the jerk policy to 1 allows jerk to be applied between any pair of moves.

                            Does that mean that the transition between a print move to a travel move will be faster or slower? I take it to mean that P0 there is no jerk applied between a print move to a travel move, so it would come to a full stop? But with P1, the X Y jerk would be applied allowing for less of a slow down?

                            Z-Bot CoreXY Build | Thingiverse Profile

                            PXP11undefined 1 Reply Last reply Reply Quote 1
                            • PXP11undefined
                              PXP11 @Phaedrux
                              last edited by PXP11

                              After some testing with M566P1 I noticed instant differences. Firstly the extruder was snappy as f***. Actually started skipping steps because of the high jerk. Went back to 1500mm/s, worked fine after that, still might be a bit too much to the point where it is not retracting but ripping apart the filament inside the hot zone.
                              Here is the video from the small cylinder, same gcode: https://1drv.ms/v/s!Alyk1AJNCCDtlQzyyP3EWgJVEntP

                              The following cubes were done with four different slicers. As far as possible with the same settings. 0.4mm retraction @60mm/s 0.2mm wipe.

                              S3D
                              IMG_20200206_172839.jpg

                              IdeaMaker
                              IMG_20200206_172846.jpg

                              PrusaSlicer
                              IMG_20200206_172850.jpg

                              Cura
                              IMG_20200206_172853.jpg

                              Prusa looked the best as far as the z-seam (or lack there of) goes. Over all Ideamaker gives the best whole picture. I'm sure I can improove the quality even further.

                              I'll be doing some more test with different filaments and M593 DAA so I can go higher on XY acc and jerk to further reduce time spent over areas while retracting (without inducing artifacts on other areas).

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                              • dc42undefined
                                dc42 administrators
                                last edited by

                                @PXP11, thanks for that. Is it your opinion that using M566 P1 has solved the problem, and your prints are no longer worse than they were using Marlin?

                                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

                                PXP11undefined 1 Reply Last reply Reply Quote 0
                                • PXP11undefined
                                  PXP11 @dc42
                                  last edited by PXP11

                                  @dc42
                                  Well M566P1 changed the movement behaviour a lot. To the better that is. I don't know why this is not yet the standart when using the configurator tool.
                                  Quality wise I'm not quite there yet but I'm sure some further tweaking will get me the same if not better results than Marlin. Even if not, RRF has spoiled me and I'm never going to switch back.

                                  Thanks for the valuable tip.

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