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XY step skipping

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  • undefined
    Sazabi
    last edited by 6 May 2021, 05:48

    Hi, everyone
    I have BLV cube with Duet 2 Wifi with rrf3.2, direct drive extruder, XY motors with radiators and coolers. Closed chamber(no wall near motors).
    For some reasons on long prints I'm having steps skipping.
    Motor current in config:
    M906 X1600 Y1600 Z1600 E1600 I30
    Print speed below 100.
    Is my current too high?

    undefined 1 Reply Last reply 6 May 2021, 05:55 Reply Quote 0
    • undefined
      jay_s_uk @Sazabi
      last edited by 6 May 2021, 05:55

      @sazabi what stepper motors are you using?

      Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

      undefined 1 Reply Last reply 6 May 2021, 08:25 Reply Quote 0
      • undefined
        Sazabi @jay_s_uk
        last edited by 6 May 2021, 08:25

        @jay_s_uk Blurolls 17HM19-2004S, came with my blv kit.

        undefined 1 Reply Last reply 6 May 2021, 08:28 Reply Quote 0
        • undefined
          jay_s_uk @Sazabi
          last edited by 6 May 2021, 08:28

          @sazabi said in XY step skipping:

          17HM19-2004S

          1600ma appears spot on for those drivers.
          are you cooling the duet 2 wifi at all? ideally, you should have air blowing across the back of the board behind the drivers

          Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

          undefined 1 Reply Last reply 6 May 2021, 08:32 Reply Quote 0
          • undefined
            Sazabi @jay_s_uk
            last edited by 6 May 2021, 08:32

            @jay_s_uk I have 5015 turbine blowing non-stop on radiators, glued on top of drivers

            undefined 1 Reply Last reply 6 May 2021, 10:12 Reply Quote 0
            • undefined
              dc42 administrators @Sazabi
              last edited by 6 May 2021, 10:12

              At 1600mA no cooling is needed, unless perhaps the Duet WiFi is in an airtight box or getting heated by other components.

              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

              undefined 1 Reply Last reply 7 May 2021, 03:47 Reply Quote 0
              • undefined
                Phaedrux Moderator
                last edited by 6 May 2021, 17:17

                Is there anything in common with when it skips steps? Certain model feature causing curling perhaps?

                Have you gone through the mechanical things that can lead to skips? Loose grub screws, binding?

                Z-Bot CoreXY Build | Thingiverse Profile

                undefined 1 Reply Last reply 7 May 2021, 03:52 Reply Quote 0
                • undefined
                  Sazabi @dc42
                  last edited by 7 May 2021, 03:47

                  @dc42 it doesnt have rear most wall, so duet isnt in closed box.

                  1 Reply Last reply Reply Quote 0
                  • undefined
                    Sazabi @Phaedrux
                    last edited by 7 May 2021, 03:52

                    @phaedrux Actually, I dont know. I left it print overnight. Looking at where is skipped, it's about half time,~6hours. It was thin, but high model.
                    I had another long time print and skipping happened also. It actually looked like not just skipped step, but ~100mm momentary drift on X axis. it happened ~10hours after print start.
                    First time belts were tight, last time I've loosen them a bit.

                    1 Reply Last reply Reply Quote 0
                    • undefined
                      Phaedrux Moderator
                      last edited by 7 May 2021, 03:57

                      Maybe setup stall detection?

                      https://duet3d.dozuki.com/Wiki/Stall_detection_and_sensorless_homing

                      Z-Bot CoreXY Build | Thingiverse Profile

                      undefined 1 Reply Last reply 21 May 2021, 11:00 Reply Quote 0
                      • undefined
                        Sazabi @Phaedrux
                        last edited by 21 May 2021, 11:00

                        @phaedrux thanks, will try than

                        1 Reply Last reply Reply Quote 0
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