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    [solved] strong vibration with pressure advance

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    Tuning and tweaking
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    • o_lampeundefined
      o_lampe @giostark
      last edited by o_lampe

      @giostark
      Looks good, but the errors on the left and right edge seem to have a regular distance, like you have Z-banding or wobble?

      giostarkundefined 1 Reply Last reply Reply Quote 1
      • giostarkundefined
        giostark @o_lampe
        last edited by

        @o_lampe
        At first I suspected it but reverting to neutral setting in Cura and disabling the pressure advance they were gone. Seems different amount of material.
        This wave artifact appear ONLY after that the nozzle turn the corner. (in this case the printer nozzle go form left to right).
        On the right the small white sign are excess of material (the light reflected them resulting in small white).
        An other strange behavior of the coasting (with the long tube and a big value of it) was that when the printer stop to extruder before applying the coasting , it leave a small blob (seems a hole but from the top view is an excess of material). This let me thing that is difficult to control the pressure so I shortened the tube.
        Now I have to play between "pressure advance", "coasting", "wall inserting" , "retraction" .
        Any your consideration is welcome!
        20210530_102459.jpg

        Hiroakiundefined 1 Reply Last reply Reply Quote 0
        • Hiroakiundefined
          Hiroaki @giostark
          last edited by

          @giostark How about the belt tension ? It seems the head goes too much due to the belt loosness.

          giostarkundefined 1 Reply Last reply Reply Quote 0
          • giostarkundefined
            giostark @Hiroaki
            last edited by

            @hiroaki
            I can try to pull them , I'll report it in the evening... now is time for prepare the climbing afternoon 😀
            tnx all of you !

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

              Generally when using pressure advance it's recommended to turn off any coasting or pre-load features of the slicer as they will fight each other.

              Also it might help to set your seam position to a fixed point to get a better idea of what the end of line is looking like. And when possible set to inside > outside perimeters to hide the atrocities that can't be tuned out.

              Z-Bot CoreXY Build | Thingiverse Profile

              giostarkundefined 1 Reply Last reply Reply Quote 1
              • giostarkundefined
                giostark @Phaedrux
                last edited by

                @phaedrux
                Other testing here. The ringing was not for the tension of the belt , at least it should not be for that, but for the speed. The belt sound as "dong". I'm not sure if are pulled enough and at the same time I don't wanna pull them to much. 30mm/s for 90degree after every corner generate that wave. 20mm/s reduce the effect a lot. Pressure advance disabled and not option enabled for the seam in Cura.
                -Top left seam at 20mm/s.
                -Top right seam at 30/mms.
                -Bottom left corner at 20mm/s (with one vertical line after every corner).
                -Bottom right corner at 30mm/s (with 6 vertical lines after every corner).
                Could be this because the head of the printer now is more heavy that in origin?
                I already have the Hayden bars , the effector seems rigid enough. The belt are chinese (the ones come with the printer). The belt with metal core were not good, them create some bad movement resulting in horrible digging on the glass. Those rubber belt can reproduce a calibration between 0.02 and 0.03 all the times but maybe are too elastic?
                I lowered the Jerk to M566 X800 Y800 Z800 E1200 and the acceleration to M201 X1000 Y1000 Z1000 E3000 , but the only thing that make a change was the final speed decreasing from 30 to 20 mm/s.
                Suggestions? 😁
                20210531_225631.jpg

                giostarkundefined 1 Reply Last reply Reply Quote 0
                • giostarkundefined
                  giostark @giostark
                  last edited by

                  o_lampe was right , it have a wobbing issue. I noticed this only now that I'm trying to speed up the machine. Are arriving new belts (hope Original Gates or at least good enough).
                  I read about removing the ringing in several guide.
                  Can someone suggest a good pancake nema 17 for the extruder? Maybe that didn't suffer of heat at ambient temp of 50 degree.
                  I should light a little the head. A direct and light drive system should be better.

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                  • Phaedruxundefined
                    Phaedrux Moderator
                    last edited by

                    Maybe an orbiter?

                    https://www.youtube.com/watch?v=qvY_dChxj0E

                    Z-Bot CoreXY Build | Thingiverse Profile

                    giostarkundefined 1 Reply Last reply Reply Quote 0
                    • giostarkundefined
                      giostark @Phaedrux
                      last edited by giostark

                      @phaedrux
                      David was intrigued by the V2 ... maybe is worth waiting for this solution.
                      I'm trying at 20mm/s , the result seems pretty good , even without pressure advance. But it is so slooooow...

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                      • Phaedruxundefined
                        Phaedrux Moderator
                        last edited by

                        Perhaps try a higher top speed but lower jerk and accel along with pressure advance.

                        Z-Bot CoreXY Build | Thingiverse Profile

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