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Bed levelling - just z probe, or 2 indep. motors with G32?

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  • undefined
    Reefwarrior @fcwilt
    last edited by 21 Mar 2021, 20:25

    @fcwilt The P is for the thread pitch ....

    I got this: Error: Number of calibration factors (4) not equal to number of leadscrews (3)

    undefined 1 Reply Last reply 21 Mar 2021, 20:27 Reply Quote 0
    • undefined
      fcwilt @Reefwarrior
      last edited by fcwilt 21 Mar 2021, 20:27

      @Reefwarrior said in Bed levelling - just z probe, or 2 indep. motors with G32?:

      @fcwilt The P is for the thread pitch ....

      I got this: Error: Number of calibration factors (4) not equal to number of leadscrews (3)

      Arggggg.....

      My bad - I confused the S and P parameters.

      When am I going to learn to not trust to memory....

      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

      undefined 1 Reply Last reply 21 Mar 2021, 20:31 Reply Quote 0
      • undefined
        Reefwarrior @fcwilt
        last edited by 21 Mar 2021, 20:31

        @fcwilt hahahaha no stress 🙂

        1 Reply Last reply Reply Quote 1
        • undefined
          Reefwarrior
          last edited by 21 Mar 2021, 20:35

          Can't seem to sort out the 'Number of calibration factors....' error.....

          1 Reply Last reply Reply Quote 0
          • undefined
            Reefwarrior
            last edited by 21 Mar 2021, 20:47

            Eureka!

            G32
            Manual corrections required: 0.00 turn up (0.00mm) 0.00 turn down (0.00mm) 0.76 turn up (-0.38mm) 0.81 turn up (-0.41mm)

            The M671 I used to define the springs positions was not correct.

            undefined 1 Reply Last reply 21 Mar 2021, 21:27 Reply Quote 1
            • undefined
              fcwilt @Reefwarrior
              last edited by 21 Mar 2021, 21:27

              @Reefwarrior said in Bed levelling - just z probe, or 2 indep. motors with G32?:

              Eureka!

              G32
              Manual corrections required: 0.00 turn up (0.00mm) 0.00 turn down (0.00mm) 0.76 turn up (-0.38mm) 0.81 turn up (-0.41mm)

              The M671 I used to define the springs positions was not correct.

              The : character after the X and Y?

              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
              • undefined
                Phaedrux Moderator @Reefwarrior
                last edited by 22 Mar 2021, 03:55

                @Reefwarrior said in Bed levelling - just z probe, or 2 indep. motors with G32?:

                This setup is basically on an Ender3 with a DuetWifi.

                I wouldn't bother changing the Ender3 to a dual Z axis setup. It's not necessary. When assembled properly the design is adequate for keeping the X gantry level. The bed can be manually leveled pretty easily, and mesh compensation can take care of the rest.

                There's something to be said for simplicity. Once you add a second Z axis motor you have to calibrate it because it won't stay in sync over time.

                Also, 2 Z motors will only give you tilt correction along a single axis. You need 3 motors to do a 3 point plane. So you'd still be using mesh compensation and manual leveling anyway.

                So I say avoid a second z axis motor if the printer design allows for it.

                Z-Bot CoreXY Build | Thingiverse Profile

                undefined 2 Replies Last reply 22 Mar 2021, 05:45 Reply Quote 0
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                  Reefwarrior @Phaedrux
                  last edited by 22 Mar 2021, 05:45

                  @Phaedrux Hi, thank you for the reply. I have extended my Z and my X axis and noticed drooping on the one side if the Z raises... hence the reason now for the second motor 🙂

                  1 Reply Last reply Reply Quote 0
                  • undefined
                    Reefwarrior @Phaedrux
                    last edited by 22 Mar 2021, 06:02

                    @Phaedrux I'm probably going too complicated now, but won't it help to have 2 indep. motors, have it correct tilt and then bed level assistant for the rest? If I read it correctly, I can not have both 2 indep and MBLA at the same time, or have I misunderstood something? 🙂

                    undefined 1 Reply Last reply 22 Mar 2021, 18:46 Reply Quote 0
                    • undefined
                      Phaedrux Moderator @Reefwarrior
                      last edited by 22 Mar 2021, 18:46

                      @Reefwarrior said in Bed levelling - just z probe, or 2 indep. motors with G32?:

                      If I read it correctly, I can not have both 2 indep and MBLA at the same time, or have I misunderstood something?

                      Yes you can use both, but there needs to be a reference somewhere. If you do the tilt correction based on the bed surface, but then change the bed surface itself with MBLA your tilt correction is now changed as well.

                      Maybe a better solution would be to correct for gantry tilt with 2 endstops at the top of the frame so that you're leveled to the frame as a reference. Then you can adjust the plane of the bed to match the frame.

                      Z-Bot CoreXY Build | Thingiverse Profile

                      undefined 1 Reply Last reply 23 Mar 2021, 03:37 Reply Quote 0
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                        Reefwarrior @Phaedrux
                        last edited by 23 Mar 2021, 03:37

                        @Phaedrux Awesome, thanx! 🙂

                        1 Reply Last reply Reply Quote 0
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