Calibration and compensation….

  • Hi,

    i have a Tevo Little Monster, a delta printer, modded with Duet Wifi and Mini Ir Sensor. From yesterday y have calibration/Compensation issues, i try to explain:

    1- Run Calibration, my [c]bed.g[/c] file:

    ; bed.g
    ; called to perform automatic delta calibration via G32
    ; generated by RepRapFirmware Configuration Tool on Sun Jan 21 2018 07:57:47 GMT+0100 (Hora estándar romance)
    M561 ; clear any bed transform
    ; bed.g file for RepRapFirmware, generated by Escher3D calculator
    ; 16 points, 6 factors, probing radius: 140, probe offset (0, 0)
    ; bed.g file for RepRapFirmware, generated by Escher3D calculator
    ; 16 points, 6 factors, probing radius: 125, probe offset (0, 0)
    G30 P0 X0.00 Y125.00 Z-99999 H0
    G30 P1 X80.35 Y95.76 Z-99999 H0
    G30 P2 X123.10 Y21.71 Z-99999 H0
    G30 P3 X108.25 Y-62.50 Z-99999 H0
    G30 P4 X42.75 Y-117.46 Z-99999 H0
    G30 P5 X-42.75 Y-117.46 Z-99999 H0
    G30 P6 X-108.25 Y-62.50 Z-99999 H0
    G30 P7 X-123.10 Y21.71 Z-99999 H0
    G30 P8 X-80.35 Y95.76 Z-99999 H0
    G30 P9 X0.00 Y62.50 Z-99999 H0
    G30 P10 X54.13 Y31.25 Z-99999 H0
    G30 P11 X54.13 Y-31.25 Z-99999 H0
    G30 P12 X0.00 Y-62.50 Z-99999 H0
    G30 P13 X-54.13 Y-31.25 Z-99999 H0
    G30 P14 X-54.13 Y31.25 Z-99999 H0
    G30 P15 X0 Y0 Z-99999 S6
    ; Use S-1 for measurements only, without calculations. Use S4 for endstop heights and Z-height only. Use S6 for full 6 factors
    ; If your 

    2- Run [c]Compensation[/c], the line in [c]config.g[/c]:

    M557 R120 S20 

    TLM have a printable diameter of 320 mm, but use R120 why sensor is displaced from center of effector, and runs out of bed…

    3- With, this strange results...

    And…. until yesterday works fine, with small prints, of 50 mm of diameter. But today i have try a medium/big print, with some parts diameter total aprox 220 mm... and problems.

    In the center of bed, think correspond to red zone in compensation diagram, works fine.
    But the problems comes, with the nozzle closes to border, think blue zone, and the nozzle is much, 3mm of bed, and in center is ok, paper think.

    What i am doing wrong?

  • administrators

    I suspect that the effector tilt is varying as it moves in the XY plane. This causes the relative heights of the nozzle and the IR sensor to change, giving inaccurate probing results. You can mount a small circular (bulls eye) spirit level on the effector to show the tilt.

  • Hi,

    today i cant test thigns… but i have retired the steel sheet i used over default bed, for test if is curved, and when try autocalibration, i have this message of Duet: [c]Error: Z probe was not triggered during probing move[/c]

    Why can be?

  • administrators

    Probably exactly what it says. When you lower the effector, does the red LED on the sensor light up before the nozzle touches the bed? If not then you probably have the sensor mounted too high, or else you are using a transparent bed material with a highly-reflecting surface underneath it.

  • if i put a layer of Kapton. Will be enough?

  • Hi,

    SOLVED, Config mistake

    After search in Tevo Little Monster Facebook Group, i have changed the [c]M665[/c] in [c]config.g[/c], and MUCH BETTER

    Before: [c]M665 R160 L360.25 B160 H518.34[/c]

    AFTER: –> [c]M665 R157 L397.1073 B175 H518.3 [/c]<–

    The results:

    Many times the solution to a problem is in the simplest answer

  • It is possible to change the probe area for a current print?

  • administrators


    It is possible to change the probe area for a current print?

    If you mean the probe area for mesh bed compensation, you can do that by sending a different M557 command before probing with G29.

  • Hi,

    when calibrate…

    There is some limit to the test point? In the web

    • Its limited to 16 points?
    • Why 7 factors calibration its not recommened? It is not recommened… why can select?

  • How is compensation done? The height of the first layer or bed up/down?

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