How is this possible even with abl? I dont’ get it…

  • GrayBackgroundMusic@lemm.eeMEnglish
    9·
    1 year ago

    ABL doesn’t automatically measure the right distance to your bed. It has no idea where your nozzle is. Your nozzle is somewhere between the sensor and the bed, but the sensor doesn’t know. You have to calibrate that. If your nozzle changes (swapped, comes loose) or your bed changes (moved, replaced, damaged) then you recalibrate.

    There should be an option to micro step your Z. I have a Sovol SV06+. I run the ABL routine, then print a 1 layer square. If that’s too close or too far, I adjust. My options are 0.05mm and 0.01mm steps. Adjust, reprint. Adjust reprint. See the images here, for what it should look like. https://help.prusa3d.com/article/first-layer-calibration-i3_112364

    • nosnahc@lemmy.worldOPEnglish
      2·
      1 year ago

      I’m agree! But look at my picture, how can it be good at some point, and to close at others?

      • rambos@lemmy.worldEnglish
        3·
        1 year ago

        You are too close everywhere. Im not using abl, but dont expect perfection from it. I believe if you increase offset it will be good everywhere. Machine can deal with small error, but not if its too much

      • p1mrx@lemmy.worldEnglish
        2·
        1 year ago

        When my Ender 3 S1 (not plus) had bed leveling issues, the problem was caused by backlash on the Z axis. It’s important that the Z axis be just loose enough that downward motion is driven by gravity. If instead the Z screws have to “pull down” on the gantry, then the height will be too sloppy for ABL to make fine adjustments.

  • GoldenSpamfish@lemmy.worldEnglish
    3·
    1 year ago

    This can be caused by gantry misalignment/warping, or not registering the bed mesh properly. Also, maybe the bed is warped in some way that was in the middle of the test points, so maybe a finer mesh could fix this.

  • thantik@lemmy.worldEnglish
    31·
    1 year ago

    Given that this doesn’t look uniform, it looks ‘random’ – you need to check that your hot end is actually secure against the X carriage.

    If this were uniform, like it faded out from a low spot - I’d tell you there was debris under the bed, or a mis-measure on the probe (it happens, they aren’t perfect)

    ABL isn’t a solution for leveling problems. ABL is a ‘lazy’ test for an already-well-tuned printer. If you’re having leveling issues, an ABL won’t work right because it assumes everything is working perfectly to begin with.