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Ongoing Mesh Level Compensation issues

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  • undefined
    ClassicStyle @droftarts
    last edited by 11 Dec 2019, 03:49

    @droftarts Thanks for the notes. I realize it's possible for my machine to need tramming, just not sure how I can get 0.5mm of accuracy on any tools I have, when I do not have a fixed frame of reference to measure against. I'll investigate though.

    @greenlee Didn't know about G29. Adding it to my print start g code in cura.

    @aidar Cool tip, I've updated this value and will report back.

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    • undefined
      ClassicStyle
      last edited by ClassicStyle 12 Nov 2019, 04:14 11 Dec 2019, 04:13

      bed is much more level, but same symptoms.
      18eb1427-2a51-4965-84ca-a587afc6e9b1-image.png

      Simplified the sample size just to be able to iterate faster. The 380 X,0 Y corner is still a bit out, but overall much better. Still no adhesion at anywhere other than the 0,0 corner.

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      • undefined
        ClassicStyle
        last edited by 11 Dec 2019, 05:13

        ugh.....
        5f8180ed-85b9-4906-86c4-b6359ad91215-image.png

        still no adhesion.

        Mirror surface with aquanet. I simply do not understand wth is going on.

        I'm trying to print in the center of the bed, but nothing sticks.

        For ref:
        known-good PLA @200C
        Mirror bed with Aquanet at room temp (works on my TronXY XY-2 no problem)
        Layer height 0.12mm
        Initial layer at 0.12mm
        0.4mm head
        print volume is 380^3

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        • undefined
          Veti
          last edited by 11 Dec 2019, 06:52

          9 points for an area of 900cm² is not enough if the area is not perfectly flat

          undefined 1 Reply Last reply 11 Dec 2019, 07:02 Reply Quote 0
          • undefined
            ClassicStyle
            last edited by 11 Dec 2019, 06:57

            buahahaha!
            Resolved with the info on the following page.
            https://duet3d.dozuki.com/Wiki/Bed_levelling_using_multiple_independent_Z_motors#Section_Example_for_2_motors

            That made everything work like butter. Yes, tramming was the major issue. I'm no longer even using mesh compensation, just the z-screw leveling. Immediate improvement and adhesion. Now I just need to make sure I'm actually at proper nozzle height, since I appear to be scraping off levels with my nozzle.

            Thanks for the tips all.

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            • undefined
              aidar
              last edited by 11 Dec 2019, 06:59

              I recommend, after you apply mesh compensation by G29 S1, move your printhead to lowest point on bed (witch is about center in your case) and do one more single probe by G30. If its still doesnt stick, increase your trigger height little by little, say 0.02 at times and try again until you find value that works for you.

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              • undefined
                ClassicStyle @Veti
                last edited by 11 Dec 2019, 07:02

                @Veti I was only using the 9 points as a quick sanity check for corners (since that's my only manual adjustment points). Not intending to stick with 9 when actually printing. But thanks for the heads up.

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                • undefined
                  Lakeman
                  last edited by 14 Dec 2019, 17:06

                  Hello,
                  On my delta I have similar issues. Recently upgraded to a duet wifi and a smart effector. All works nice, except I cannot get a decent first layer. Mesh compensation is enabled in the web interface (I do not have extra code for this in the g-code). Leveling works nice, I set it to probe each point max 3 times with a maximun error of 0.02mm (smaller fails). Bed is heated up before probing, and no homing after probing in case of any errors there.
                  The level picture looks consistent every time. also with a simple paper test it seems in the ball park.height map.JPG
                  first layer thickness is 0.15 At some points it is scraping the bed, and some points it is not sticking. This varies over a short bit of the bed.
                  The bed level is maybe not great, but even the old anycubic board dealt with it better.
                  It is an anycubic predator by the way, with smart effector and magball arms.
                  first layer.JPG
                  This is my best result so far...

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                  • undefined
                    dc42 administrators
                    last edited by dc42 15 Dec 2019, 11:32

                    The bed height map shouldn't have that tilt if your machine has been calibrated. When you run auto calibration, how many factors are you using (the S parameter in the final G30 command in bed.g), and what deviation is reported?

                    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
                      Lakeman
                      last edited by 15 Dec 2019, 12:42

                      S6 is the parameter in the final G30 command.
                      auto calibration.JPG
                      Not sure what it does with this and what the difference is between the mesh grid compensation. I did try both, but not to much result.

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                      • undefined
                        Lakeman
                        last edited by 15 Dec 2019, 17:31

                        Ok, RTFM. so I did an autocalibration and put those values in the config.g
                        After that this height map is the result:
                        height map.JPG
                        The tilt is still there, tried it twice with the same result. Also the printing gives the same first layer with the highs and lows in the same place...

                        undefined 1 Reply Last reply 15 Dec 2019, 18:41 Reply Quote 0
                        • undefined
                          Phaedrux Moderator @Lakeman
                          last edited by 15 Dec 2019, 18:41

                          @Lakeman Perhaps you should start a new thread with your issue. Include the details of your own machine, include you config files, etc.

                          Z-Bot CoreXY Build | Thingiverse Profile

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