Anycubic Predator printing skews in Y direction

  • 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:

    Then, in a row:

    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:

    Any advice will be graciously accepted. Thanks so much!

    Thanks in advance!

  • Moderator

    @CoolioX I’m sure you’re already familiar with the Duet delta calibration page, but can’t hurt to go through it again:

    I also found this page useful for understanding what the bed mesh was trying to tell me:


  • @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!

  • @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.

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

  • 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

  • Glad you got it sorted

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