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    mesh bed compensation not compensating

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    • Jaysonundefined
      Jayson @fcwilt
      last edited by

      @fcwilt
      And I should be the one thanking you.

      I'm at a loss with this machine. Hopefully someone here can figure out how to make it dance for me

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      • fcwiltundefined
        fcwilt @Jayson
        last edited by

        @jayson said in mesh bed compensation not compensating:

        @fcwilt
        It's just a little micro switch.

        This is a tool changing machine so I gave the probe 0 offset and apply an individual offset to each tool.

        It's not all configured yet. I just have one nozzle printing now.

        So the probe actually triggers at exactly Z=0?

        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

        Jaysonundefined 1 Reply Last reply Reply Quote 0
        • Jaysonundefined
          Jayson @fcwilt
          last edited by

          @fcwilt
          The machine homes and probes without a hot end attached then when it starts printing it picks up a tool from the rack and uses that tools offsets.

          The nozzle I currently have configured hangs about 11mm below the switch when mounted. So T1 has a -11 mm z offset.

          I believe that the e3d tool changer uses a similar method

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

            @jayson said in mesh bed compensation not compensating:

            about 11mm

            This is going to need to be quite exact otherwise the nozzle will never touch the bed where you expect. Same goes for the XY offset.

            Can you post a photo of your heightmap image?

            M376 H10

            You might need to eliminate that for now until you get things working and know how quickly you can actually taper off the compensation.

            Z-Bot CoreXY Build | Thingiverse Profile

            Jaysonundefined 2 Replies Last reply Reply Quote 1
            • Jaysonundefined
              Jayson @Phaedrux
              last edited by

              @phaedrux said in mesh bed compensation not compensating:

              M376 H10

              It set at 11.2 mm to make a good section of my bed useable.

              I will take out that M376 and see if that helps.

              thank you

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              • Jaysonundefined
                Jayson @Phaedrux
                last edited by

                @phaedrux
                my bed is a little warped, needs some work but nothing bed compensation should handle it for now.

                Number of points: 100
                Probe area: 2397.1 cm²
                Maximum deviations: -0.270 / 0.581 mm
                Mean error: 0.252 mm
                RMS error: 0.184 mm

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                • Phaedruxundefined
                  Phaedrux Moderator
                  last edited by

                  For such a large bed you may need to increase the point density. 441 is the max number of points and you're only using 100. That can mean a large distance between points where interpolation has to guess what the bed height actually is. Combine that with XYZ offsets that aren't quite accurate and it's going to have a very hard time keeping the nozzle where it's supposed to be.

                  Z-Bot CoreXY Build | Thingiverse Profile

                  Jaysonundefined 1 Reply Last reply Reply Quote 1
                  • Jaysonundefined
                    Jayson @Phaedrux
                    last edited by

                    @phaedrux I took out that m376 and now it's working 🎉 thank you so much!

                    Its not great but it is actually usable over my whole bed now.

                    Things are a bit temporary right now as I plan on changing most of this printer. as soon as it can print its own replacement parts I will rebuild it and maybe double my probing points.
                    I just don't want to wait that long for it to probe....

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

                      @jayson said in mesh bed compensation not compensating:

                      I just don't want to wait that long for it to probe....

                      Well if the bed is stable and things don't shift around too much you can save a detailed heightmap and load it instead of probing before each print.

                      G29 S1 to load saved map.

                      Z-Bot CoreXY Build | Thingiverse Profile

                      Jaysonundefined 1 Reply Last reply Reply Quote 1
                      • Jaysonundefined
                        Jayson @Phaedrux
                        last edited by

                        @phaedrux I might try G29 S1 but I have a removable magnetic bed. so if I have to take it off I will probably need to re-probe.

                        Phaedruxundefined fcwiltundefined 2 Replies Last reply Reply Quote 0
                        • Phaedruxundefined
                          Phaedrux Moderator @Jayson
                          last edited by

                          @jayson said in mesh bed compensation not compensating:

                          so if I have to take it off I will probably need to re-probe.

                          Maybe, maybe not. If it registers pretty much the same each time it should be ok. Only one way to find out for sure.

                          Z-Bot CoreXY Build | Thingiverse Profile

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                          • fcwiltundefined
                            fcwilt @Jayson
                            last edited by

                            @jayson said in mesh bed compensation not compensating:

                            @phaedrux I might try G29 S1 but I have a removable magnetic bed. so if I have to take it off I will probably need to re-probe.

                            I have the BuildTak system and I use the same height map.

                            I do re-create it from time to time.

                            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

                            Jaysonundefined 1 Reply Last reply Reply Quote 0
                            • Jaysonundefined
                              Jayson @fcwilt
                              last edited by

                              @fcwilt I have the buildtak system. Just have to try it

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