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Independently leveled Z axis Issue

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  • undefined
    mrenz999
    last edited by 8 Mar 2021, 22:47

    Measuring the bed to nozzle it appears and is without question twisted. But if you tell me how to do a 4 point height map I will do one now.

    1 Reply Last reply Reply Quote 0
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      fcwilt @mrenz999
      last edited by 8 Mar 2021, 22:50

      @mrenz999 said in Independently leveled Z axis Issue:

      @fcwilt What is the correct procedure for getting a 4 point height map ? 410x410 Bed ? lol

      On my printer where X=0 and Y=0 is at the center of the 300 x 300 bed I used something like this:

      M557 X-130:130 Y-130:130 P2:2 ; define 4 point mesh for G29

      Your values will depend on the X and Y offsets of your probe and the min/max values of your X and Y axes. Just try to keep the probe area centered on the bed.

      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 undefined 2 Replies Last reply 9 Mar 2021, 01:33 Reply Quote 0
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        mrenz999 @fcwilt
        last edited by 9 Mar 2021, 01:33

        @fcwilt 74F8FDA7-A36F-4BF5-8412-C47969D153D8.jpeg

        undefined 1 Reply Last reply 9 Mar 2021, 01:46 Reply Quote 0
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          3DPrintingWorld @fcwilt
          last edited by 9 Mar 2021, 01:36

          Thanks @fcwilt, think you finally helped me realize my issue. Only four points makes the map much easier to understand.

          When I first ran the mesh the left back corner was really low. I have a glass plate on top of a sheet magnet. I am only using glass because I wanted to verify the bed was flat.
          glass-w clips.png

          I'm clipping down the bed in the back center left and front center right. I moved both clips to center right and reran the mesh and the low corner goes away!
          glass.png

          Upon further inspection of the magnetic sheet shows small cracks where it starts to turn blue in the first map. I think these crack are causing the issue. I'll remove the magnet an put the glass directly on the bed tomorrow and give it a try.

          undefined 1 Reply Last reply 9 Mar 2021, 01:39 Reply Quote 1
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            mrenz999 @3DPrintingWorld
            last edited by 9 Mar 2021, 01:39

            @3DPrintingWorld In your bed.g do you have it do multiple probes per point ? If so how do you accomplish that ?

            undefined undefined 2 Replies Last reply 9 Mar 2021, 01:48 Reply Quote 0
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              fcwilt @mrenz999
              last edited by 9 Mar 2021, 01:46

              @mrenz999 Thanks.

              The is an extreme version of what my height map looked like.

              Is this what the frame of your printer looks like?

              BLV Printer Frame.jpg

              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
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                mrenz999
                last edited by mrenz999 3 Sept 2021, 01:48 9 Mar 2021, 01:47

                Yes thats the one 🙂 Except I have 3 z motors. 2 on the right side and 1 on the left

                undefined 1 Reply Last reply 9 Mar 2021, 01:49 Reply Quote 0
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                  fcwilt @mrenz999
                  last edited by 9 Mar 2021, 01:48

                  @mrenz999 said in Independently leveled Z axis Issue:

                  @3DPrintingWorld In your bed.g do you have it do multiple probes per point ? If so how do you accomplish that ?

                  Read up about the A and S parameters of M558.

                  If A = 10 and S=0.01 the process will probe each point up to 10 times trying to get two consecutive readings with 0.01.

                  If it fails to do that it will average all 10 readings.

                  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 9 Mar 2021, 01:49 Reply Quote 0
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                    mrenz999 @fcwilt
                    last edited by 9 Mar 2021, 01:49

                    @fcwilt Perfect. Thank you. Does it matter where in the M558 I put that ?

                    undefined 1 Reply Last reply 9 Mar 2021, 01:50 Reply Quote 0
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                      fcwilt @mrenz999
                      last edited by 9 Mar 2021, 01:49

                      @mrenz999 said in Independently leveled Z axis Issue:

                      Yes thats the one 🙂 Except I have 3 z motors. 2 on the right side and 1 on the left

                      And the linear guides are on the underside of the top most frame pieces?

                      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
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                        fcwilt @mrenz999
                        last edited by 9 Mar 2021, 01:50

                        @mrenz999 said in Independently leveled Z axis Issue:

                        @fcwilt Perfect. Thank you. Does it matter where in the M558 I put that ?

                        No just add them to your current M558 command.

                        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 9 Mar 2021, 01:51 Reply Quote 0
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                          mrenz999 @fcwilt
                          last edited by 9 Mar 2021, 01:51

                          @fcwilt 0ECE84DA-7325-4F23-B80F-F831165E2698.jpeg

                          undefined undefined 2 Replies Last reply 9 Mar 2021, 01:53 Reply Quote 0
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                            fcwilt @mrenz999
                            last edited by 9 Mar 2021, 01:53

                            @mrenz999

                            Sorry but I cannot tell where they are from that picture - I may be looking right at them and just not seeing them.

                            So where are the left and right linear guides mounted?

                            Thanks.

                            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 9 Mar 2021, 01:55 Reply Quote 0
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                              mrenz999 @fcwilt
                              last edited by 9 Mar 2021, 01:55

                              @fcwilt So the left one is in the middle of the bed on the X axis. The 2 on the right are at the corners of the bed frame. The bed frame sits on the attachment to the linear guide mounts

                              undefined 1 Reply Last reply 9 Mar 2021, 01:56 Reply Quote 0
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                                fcwilt @mrenz999
                                last edited by 9 Mar 2021, 01:56

                                @mrenz999 said in Independently leveled Z axis Issue:

                                @fcwilt So the left one is in the middle of the bed on the X axis. The 2 on the right are at the corners of the bed frame. The bed frame sits on the attachment to the linear guide mounts

                                Sorry I was not clear - I meant the Y axis guides - the ones running front to back on each side.

                                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 9 Mar 2021, 01:58 Reply Quote 0
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                                  mrenz999 @fcwilt
                                  last edited by 9 Mar 2021, 01:58

                                  @fcwilt gotcha. The are underneath
                                  BC92041E-461A-4613-B942-F6B99FE7EEC6.jpeg

                                  undefined 1 Reply Last reply 9 Mar 2021, 02:05 Reply Quote 0
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                                    3DPrintingWorld @mrenz999
                                    last edited by 9 Mar 2021, 02:04

                                    @mrenz999 said in Independently leveled Z axis Issue:

                                    @3DPrintingWorld In your bed.g do you have it do multiple probes per point ? If so how do you accomplish that ?

                                    I created a macro that heats the bed, calls out the mesh, homes, does the mesh, saves the mesh, then turns the bed off. I started at 10:10, then S= was my max travel minus 10. Plus you have to add/subtract your probe to nozzle offset.

                                    M140 S60
                                    M557 X10:365 Y10:290 S300:270
                                    G28
                                    G29 S0
                                    G29 S3
                                    M140 S0

                                    undefined 1 Reply Last reply 9 Mar 2021, 02:07 Reply Quote 0
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                                      fcwilt @mrenz999
                                      last edited by 9 Mar 2021, 02:05

                                      @mrenz999

                                      Great.

                                      Did you print out those "tools" designed to help align the frame pieces?

                                      I didn't have such tools and after seeing my 4 point height map I realized that my left and right Y axis guides were not in the same plane meaning the frame pieces were not in the same plane.

                                      I closely examined the left and right frame pieces where they joined the four vertical pieces at the top and found that they were at slightly different heights, with the left piece being low in the rear and right piece being high in the front.

                                      We are talking fractions of a mm but it was enough to generate a "twisted" height map - though not as bad as yours.

                                      Perhaps you are having the same problem.

                                      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 9 Mar 2021, 02:07 Reply Quote 0
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                                        3DPrintingWorld @mrenz999
                                        last edited by 9 Mar 2021, 02:06

                                        @mrenz999

                                        Looks like one of your bearings is not attached?

                                        ![0_1615255538626_bearing.png](Uploading 100%)

                                        undefined 1 Reply Last reply 9 Mar 2021, 02:07 Reply Quote 0
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                                          mrenz999 @fcwilt
                                          last edited by 9 Mar 2021, 02:07

                                          @fcwilt Perhaps. I did print the tool but things move so I will recheck them.
                                          Is there a way to add the a and s parameter to your bed.g when doing the leveling so it does multiple probes ?

                                          undefined 1 Reply Last reply 9 Mar 2021, 02:09 Reply Quote 0
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