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Anycubic Predator printing skews in Y direction

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  • undefined
    CoolioX
    last edited by 25 Feb 2020, 20:53

    Greetings --

    Recently, my Predator was having issues where it would automatically zero out at a higher position that it should have. As a result, I attempted many things (physical tightening of belts and software autocalibration) to try and get the printer to resolve. Thanks to this forum, I got the height issue resolved, but NOW I have issues where printing a simple XYZ calibration cube finishes in some messed up ways.

    To demonstrate this, I printed out a series of calibration cubes around the print bed. I've labeled them in the photo 2.1 - 2.7.

    First how I positioned them on the bed:
    delta_bed_all_cubes.jpg

    Then, in a row:
    all_cubes_in_row.jpg

    They all seem to have some skew in the Y-direction.

    Additionally, here's a photo of my height map (which seems extremely irregular)

    Screen Shot 2020-02-25 at 3.43.40 PM.jpg

    Also attached, are my config, config-override and bed files:
    bed.g
    config.g
    config-override.g

    Any advice will be graciously accepted. Thanks so much!

    Thanks in advance!

    undefined 1 Reply Last reply 25 Feb 2020, 21:38 Reply Quote 0
    • undefined
      droftarts administrators @CoolioX
      last edited by 25 Feb 2020, 21:38

      @CoolioX I’m sure you’re already familiar with the Duet delta calibration page, but can’t hurt to go through it again: https://duet3d.dozuki.com/Wiki/Calibrating_a_delta_printer

      I also found this page useful for understanding what the bed mesh was trying to tell me: http://boim.com/DeltaUtil/CalDoc/Calibration.html

      Ian

      Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

      1 Reply Last reply Reply Quote 0
      • undefined
        CoolioX
        last edited by 25 Feb 2020, 21:52

        @droftarts -- Thanks -- I have gone through "Calibrating a Delta Printer" many times previously. I should point out that at some point, my Predator WAS working with the Duet board, so I'm still trying to work out if it's a mechanical or software issue. I'll check the second link. Much appreciated!

        1 Reply Last reply Reply Quote 0
        • undefined
          jay_s_uk
          last edited by 25 Feb 2020, 22:04

          @CoolioX

          I'm guessing its more than likely mechanical.
          I run a duet board in my predator without issue. In fact, looking at your config, you're running my version anyway.

          I've recently had to change a few mini wheels on one of the axis due to poor quality bearings. I have also had a belt snap. I would suggest removing a tower/axis at a time and stripping it to parts and inspecting.

          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 25 Feb 2020, 22:18 Reply Quote 1
          • undefined
            CoolioX @jay_s_uk
            last edited by 25 Feb 2020, 22:18

            @jay_s_uk -- and thank YOU for your repo! It was a great help to getting me started!

            1 Reply Last reply Reply Quote 0
            • undefined
              CoolioX
              last edited by 27 Feb 2020, 03:58

              Thanks to everyone for their help and suggestions! Turns out it WAS totally a mechanical issue. There was a grub screw that fell out of the stepper motor pulley on the back motor. Here are the results after adjusting!

              Original in Purple, new in BLUE:

              IMG_8324.jpeg IMG_0307.jpeg IMG_9705.jpeg

              1 Reply Last reply Reply Quote 1
              • undefined
                jay_s_uk
                last edited by 27 Feb 2020, 07:13

                Glad you got it sorted

                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

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