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Z Problem with Idex

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  • undefined
    stephenc
    last edited by 5 Jan 2018, 17:46

    Need help please.

    https://i.imgur.com/NhZzq6y.jpg

    My 2nd extruder in mid print appear to dig into previous layer and cause shifting problem. Had to cancel the print.

    Stephen

    Stephen
    https://github.com/stephenci/ZideX

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    • undefined
      stephenc
      last edited by 6 Jan 2018, 18:12

      here's zooming in

      [update] change the I30 to I60 seems to have solved the issue. is this related to this issue?
      M906 X950 U950 Y950 Z980 E800:800 I60 ; Set motor currents (mA) and motor idle factor in per cent

      Stephen
      https://github.com/stephenci/ZideX

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      • undefined
        dc42 administrators
        last edited by 6 Jan 2018, 20:37

        I can't see why increasing the idle current should have changed anything unless the original problem occurred after you paused and resumed the print, and 30% idle current was insufficient to maintain the position of the effector in the paused state.

        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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        • undefined
          stephenc
          last edited by 1 Jun 2018, 21:34 6 Jan 2018, 21:32

          I didn't pause and resume the print

          Agreed I also don't think what I did ( from 30 to 60) should fix the problem especially when the problem appear to happen during printing, so the active toolhead (T1) was dipping midprint. Strangely T0 actually holds its z position…

          And also more strangely I don't have this Z dipping issue if I do single head printing only. Tested with both T0 and T1 and each of them successfully complete the print

          There might be something happening during toolchange... I'm not sure

          Stephen
          https://github.com/stephenci/ZideX

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          • undefined
            stephenc
            last edited by 7 Jan 2018, 06:22

            Dc42 don't worry about this one. I'm 99% certain it is my build issue. I know what happened and will post solution here once I worked it out so as to close this post. Just want to give you heads up. It's the bowden tube pressure buildup pressing down the hotend…

            Stephen
            https://github.com/stephenci/ZideX

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            • undefined
              stephenc
              last edited by 12 Jan 2018, 18:23

              [solved]

              I have a very short ptfe betwee bondtech and e3d heatsink. Turns out I had used the wrong nozzle size.. I installed 0.25mm and when slicing I set it as though it's a 0.3mm nozzle… This result in too much pressure in the ptfe and bondtech never slips so it pushes down the e3d hence giving me false thinking that the z tower on right side appear to struggle...

              Stephen
              https://github.com/stephenci/ZideX

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