Mesh compensation not working on Tevo Little Monster



  • 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


  • Moderator

    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



  • 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



  • @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.



  • 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?



  • 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...



  • @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



  • @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


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