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    Bed mesh correction and tool offsets...

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    • Phaedruxundefined
      Phaedrux Moderator
      last edited by

      If the adjustments to the z position with baby stepping are consistent based on XY location as you say, then you could potentially directly edit the heightmap.csv to alter the points to match reality.

      Z-Bot CoreXY Build | Thingiverse Profile

      Diamondbackundefined 1 Reply Last reply Reply Quote 0
      • Diamondbackundefined
        Diamondback @Phaedrux
        last edited by

        @phaedrux Yea I guess technically that would be possible, but I have really no idea how one would do that in practice (finding the offset for each recorded csv value during a print).
        I guess maybe one would have to print a grid or something very slowly and a turn at each probe point so it applies the new babystepping?

        Dunno, seems... complicated 😄

        fcwiltundefined 1 Reply Last reply Reply Quote 0
        • fcwiltundefined
          fcwilt @Diamondback
          last edited by

          @diamondback said in Bed mesh correction and tool offsets...:

          Dunno, seems... complicated 😄

          Because it is.

          Perhaps the best meaningful solution is to simply wait until you can replace the current bed with something better.

          Frederick

          Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

          Diamondbackundefined 1 Reply Last reply Reply Quote 1
          • Diamondbackundefined
            Diamondback @fcwilt
            last edited by

            @fcwilt Hm... While an option, I don't feel this is the correct option here...
            This bed worked fine, so it's not like RRF can't deal with it. I really feel like some place is using the wrong tool offsets...

            fcwiltundefined 1 Reply Last reply Reply Quote 0
            • Phaedruxundefined
              Phaedrux Moderator
              last edited by

              @diamondback said in Bed mesh correction and tool offsets...:

              M208 X-146:159 Y{global.minY}:{global.maxY} C0:250 Z0:290 ; set axis minima & maxima

              Can you check that anywhere you have variables and conditional code that it evaluated correctly?

              You can send M208 M577 etc by themselves in the gcode console and it will report what the current value is.

              Z-Bot CoreXY Build | Thingiverse Profile

              Diamondbackundefined 1 Reply Last reply Reply Quote 1
              • Diamondbackundefined
                Diamondback @Phaedrux
                last edited by

                @phaedrux Will do, however, these globals are a super recent addition and the issue way predates this specific mesh setup.

                1 Reply Last reply Reply Quote 0
                • fcwiltundefined
                  fcwilt @Diamondback
                  last edited by

                  @diamondback said in Bed mesh correction and tool offsets...:

                  @fcwilt Hm... While an option, I don't feel this is the correct option here...
                  This bed worked fine, so it's not like RRF can't deal with it. I really feel like some place is using the wrong tool offsets...

                  Do you really want to print on a Pringle? 😉

                  Frederick

                  Printers: a small Utilmaker style, a small CoreXY and a E3D MS/TC setup. Various hotends. Using Duet 3 hardware running 3.4.6

                  1 Reply Last reply Reply Quote 0
                  • Diamondbackundefined
                    Diamondback
                    last edited by

                    So, the saga continues. I managed to upgrade my bed to the new version, adjusted the frame and linear rails a bit and finally ended up with this mesh when probing the raw bed surface (no print surface attached yet)
                    unknown.png
                    unknown (1).png

                    So, as far as I am concerned, this is as flat as it's ever going to be.

                    After installing the magnetic build surface I ended up with this as my final mesh:
                    2021-07-14_16-02-20.png

                    So while a little less perfect, still good enough.

                    The fun thing now is that the behavior still exists... So it wasn't the bed afterall.

                    Here you can see a random brim from some print. As you can see the top right corner still has a massively different Z-Offset than the rest...
                    IMG_20210709_004505.jpg
                    This was printed right in the center of the bed, so where the mesh is perfectly flat.

                    Any further ideas....?

                    Egon.Netundefined 1 Reply Last reply Reply Quote 1
                    • Egon.Netundefined
                      Egon.Net @Diamondback
                      last edited by

                      I am in the very same situation. Same kind of machine, but just one Z motor moving two ballscrews.

                      1 Reply Last reply Reply Quote 1
                      • Phaedruxundefined
                        Phaedrux Moderator
                        last edited by

                        Can you try doing a higher density mesh of only the small area in the center of the bed where you will be printing and see if that helps. Or if you have the time, probe the entire bed with a higher density. You're using 100 points of a possible 441.

                        Z-Bot CoreXY Build | Thingiverse Profile

                        Egon.Netundefined Diamondbackundefined 2 Replies Last reply Reply Quote 0
                        • Egon.Netundefined
                          Egon.Net @Phaedrux
                          last edited by

                          @phaedrux said in Bed mesh correction and tool offsets...:

                          Can you try doing a higher density mesh of only the small area in the center of the bed where you will be printing and see if that helps. Or if you have the time, probe the entire bed with a higher density. You're using 100 points of a possible 441.

                          I aleady do, and I have the very same problem 😞

                          Phaedruxundefined 1 Reply Last reply Reply Quote 0
                          • Phaedruxundefined
                            Phaedrux Moderator @Egon.Net
                            last edited by

                            @egon-net You may want to start a new thread with your particular details so we can work through what's going on with your setup.

                            Z-Bot CoreXY Build | Thingiverse Profile

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                            • Diamondbackundefined
                              Diamondback @Phaedrux
                              last edited by

                              @phaedrux Here's one with 400 points:
                              2021-07-15_00-43-17.png

                              What surprises me the most is that the magnitude of the error did not change at all, these "loose brims" look exactly the same as with the old bed, despite having a much flatter bed.

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                              • Phaedruxundefined
                                Phaedrux Moderator
                                last edited by

                                Can you do a test print with this file to get a sense of the entire bed surface?

                                bedlevel_nozzle_0.4_200x200-0.3-0.8.stl

                                Z-Bot CoreXY Build | Thingiverse Profile

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