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    Mesh compensation not working on Tevo Little Monster

    Tuning and tweaking
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    • carfnann
      carfnann last edited by

      Hi,

      I'm having some issue with Mesh Compensation.
      My bed height map is pretty good :
      Capture d’écran 2020-06-15 à 14.19.27.png

      here the height map.csv ;
      Capture d’écran 2020-06-15 à 14.25.18.png

      But when I'm printing, the result is not consistent depending on the point.
      You can see on the picture :
      global view :
      IMG_2551.jpeg

      Some spot are OK
      IMG_2552.jpeg

      Some spot are too high
      IMG_2553.jpeg

      Some spot (and skirt) are crushed...
      IMG_2554.jpeg

      I have double check, but my dashboard is showing : "Compensation in Use : Mesh"
      And my start G-code is

      G28 ; Home
      ; G32
      G29 S1
      G92 E0 ; set the extruder to 0
      G1 E8 ; prime the nozzle
      

      Any help?

      Many thanks

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

        What is the probe type? There may be a geometry error causing you issues, such as effector tilt combined with an offset probe which would give an incorrect height reading based on head position.

        In general, this should be your guide for a delta: https://duet3d.dozuki.com/Wiki/Calibrating_a_delta_printer

        carfnann 1 Reply Last reply Reply Quote 1
        • giostark
          giostark last edited by giostark

          If you have original bars probably is because of that:
          https://forum.duet3d.com/topic/6951/not-yet-solved-tevo-little-monster-duetwifi-errors/137
          look the last post. And please , if you want save your time and liver have a look there and make that check. All bars MUST stay in 0.1 of total variance. Tevo offer more than 6 times. An expectation for a precision tool is a precision hardware , but that brand disregard this.
          Unfortunately the Tevo non represent the standard of art for quality check or precision in production.
          My upper frame holes were not aligned with the holes of the 3 towers. I had to dismount everything 3 times (and drill) for reach a good result but I'm steel working on it.
          I see that still you are using an hardware bed leveling (me too with spring under each screw). My glass is not glued properly even in the aluminium frame. If you sum all the geometries issues, a decent (large) print is hard to reach.
          Also make sure those distance are equals:
          alt text
          alt text
          alt text

          crpalmer carfnann 2 Replies Last reply Reply Quote 1
          • crpalmer
            crpalmer @giostark last edited by

            @giostark The glueing of the glass is amazingly bad. I cut the glass out of the aluminum frame and that was the single best single quality improved I made.

            1 Reply Last reply Reply Quote 0
            • giostark
              giostark last edited by

              So ,do you have removed the glass in favor of a metal plate? Or did you reapplied in a better way the original glass and applied above the metal?
              Which resistor did you use? the original one?
              I have 3 glasses custom made of 34cm diameter (a little smaller than the original for let me use a sensor on the edge) , that I exchange on the original one. I use Vinavil for the adhesion part. I applied also a second circular resistor for compensate the radial dissipation.
              I have a thermo-camera and I have seen in the stock setup that when the center present 100degree in the peripheral areas the temp is even 75degree.
              Now I can compensate for reach a far even heat distribution. (looking for large print with ASA)
              Soon as possible I'll post those work in my 3d of the my conversion.
              Did you look with a thermo-camera at your bed heat?

              1 Reply Last reply Reply Quote 0
              • crpalmer
                crpalmer last edited by

                I had moved to fsr sensors and after removing the glass I did this: https://www.thingiverse.com/thing:2785213

                I don't only print large objects in pla and rarely to the edges of the bed (most get wider higher up) so I wasn't in the least bit motivated to get the edges to heat well enough to melt my mounts...

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

                  @Phaedrux said in Mesh compensation not working on Tevo Little Monster:

                  What is the probe type? There may be a geometry error causing you issues, such as effector tilt combined with an offset probe which would give an incorrect height reading based on head position.

                  In general, this should be your guide for a delta: https://duet3d.dozuki.com/Wiki/Calibrating_a_delta_printer

                  Hi

                  I'm using the BL Touch provide with the TLM.
                  i have already check this guide, but nothing help with me

                  1 Reply Last reply Reply Quote 0
                  • carfnann
                    carfnann @giostark last edited by carfnann

                    @giostark said in Mesh compensation not working on Tevo Little Monster:

                    If you have original bars probably is because of that:
                    https://forum.duet3d.com/topic/6951/not-yet-solved-tevo-little-monster-duetwifi-errors/137
                    look the last post. And please , if you want save your time and liver have a look there and make that check. All bars MUST stay in 0.1 of total variance. Tevo offer more than 6 times. An expectation for a precision tool is a precision hardware , but that brand disregard this.
                    Unfortunately the Tevo non represent the standard of art for quality check or precision in production.
                    My upper frame holes were not aligned with the holes of the 3 towers. I had to dismount everything 3 times (and drill) for reach a good result but I'm steel working on it.
                    I see that still you are using an hardware bed leveling (me too with spring under each screw). My glass is not glued properly even in the aluminium frame. If you sum all the geometries issues, a decent (large) print is hard to reach.
                    Also make sure those distance are equals:

                    Thanks dude, I have to check my original bar indeed.
                    yesterday I've order magball, maybe it will help

                    i will check as well the pillar, thx

                    1 Reply Last reply Reply Quote 0
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