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M376 (Set bed compensation taper) not working?

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  • undefined
    Yonkiman
    last edited by 18 Dec 2017, 00:16

    I have [c]M376 H0.5[/c] in my config.g, but I just noticed the Z is still continuously being adjusted despite my current print's Z having exceeded 21mm.

    Is there a minimum value (is 0.5mm too low)?

    Or is there some other way M376 could be overridden/cancelled? (I know I don't have any other M376 commands anywhere else.)

    Running 1.20RC1 (2017-12-08)

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    • undefined
      dc42 administrators
      last edited by 18 Dec 2017, 16:55

      Yes 0.5mm is too low. The minimum is 1mm.

      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
        SuperJETT
        last edited by 18 Dec 2017, 19:57

        I think you'd prefer to have the taper over a higher distance anyway. I use 10mm for mine, though with my piezo sensor leveling I only have maybe .1mm difference from high-low points.

        Custom CoreXY at home with Duet Wifi, Hemera

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        • undefined
          dc42 administrators
          last edited by 19 Dec 2017, 12:11

          @SuperJETT:

          I think you'd prefer to have the taper over a higher distance anyway. I use 10mm for mine, though with my piezo sensor leveling I only have maybe .1mm difference from high-low points.

          That's why we set a minimum. If you use e.g. 0.2mm layer height, then if the taper height is only 1mm, 20% of the correction will be removed on each of the first 5 layers. So if there are height errors of up to +/-0.1mm, there will be up to +/-0.02mm variation in layer height during the first 5 layers. The firmware doesn't yet correct for this, so this represents 10% over or under extrusion in places caused by the tapering. A higher taper distance will reduce this effect.

          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
            Yonkiman
            last edited by 19 Dec 2017, 17:56

            Thanks everyone. In my mind I'd had it set to 5mm (I must have been thinking cm when I entered it) - was surprised to see 0.5mm in my config, but I still expected it to work (maybe not work WELL) since I didn't see a minimum in the docs.

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