G30 Height Tuning using a calibration object



  • Edit I can definitely see immediate improvement by adding H-0.05 to the tower probe points, I'll update with a new bed.g file once I get a cleaner calibration cylinder.

    Would it make sense to adjust the sensor H values based on a calibration circle and how thick or thin the layer squish appears to be?

    I'm thinking I should add H-0.02 to the X, Y, and Z Tower and reprint to see how it looks.

    Here's an imgur album of my calibration object (a 0.2mm cylinder with a triangular grid pattern inside, 0.4mm nozzle).

    https://imgur.com/a/Dy9lw

    Just an image from the bed:

    With FSR sensors, is there a general height setting that I should start with other than zero?

    I was thinking about adjusting the H-values 0.04mm at a time until the whole calibration object looks even.

    Also, the stated Delta Radius of the Max Metal build I have is 141mm, but calibration tends to put it at 142mm. Should I reset that value to 141mm or just not worry about it?

    It looks like along the towers I am too close to the bed.

    My G30 probe points from bed.g file currently looks something like:

    ; bed.g file for RepRapFirmware, generated by Escher3D calculator
    ; 13 points, 6 factors, probing radius: 130, probe offset (0, 0)
    G30 P0 X0.00 Y130.00 Z-99999 H0
    G30 P1 X112.58 Y65.00 Z-99999 H0
    G30 P2 X112.58 Y-65.00 Z-99999 H0
    G30 P3 X0.00 Y-130.00 Z-99999 H0
    G30 P4 X-112.58 Y-65.00 Z-99999 H0
    G30 P5 X-112.58 Y65.00 Z-99999 H0
    G30 P6 X0.00 Y65.00 Z-99999 H0
    G30 P7 X56.29 Y32.50 Z-99999 H0
    G30 P8 X56.29 Y-32.50 Z-99999 H0
    G30 P9 X0.00 Y-65.00 Z-99999 H0
    G30 P10 X-56.29 Y-32.50 Z-99999 H0
    G30 P11 X-56.29 Y32.50 Z-99999 H0
    G30 P12 X0 Y0 Z-99999 S6


  • administrators

    With FSRs the trigger height will always be slightly below zero, and it may vary depending on how close to one of the FSRs the probe point is. I suggest you measure the trigger height at a few points (see https://duet3d.com/wiki/Calibrating_a_delta_printer#Measuring_the_trigger_height)) and use the results to determine what H corrections you need, if any.

    Don't worry about the delta radius being not quite what you expect, unless you have distorted prints. Print a noughts-and-crosses/tic-tac-toe pattern that goes right up to the edges of the printable area, and check that the lines are straight.



  • @dc42:

    With FSRs the trigger height will always be slightly below zero, and it may vary depending on how close to one of the FSRs the probe point is. I suggest you measure the trigger height at a few points (see https://duet3d.com/wiki/Calibrating_a_delta_printer#Measuring_the_trigger_height)) andf use the results to determine what H corrections you need, if any.

    Don't worry about the delta radius being not quite what you expect, unless you have distorted prints. Print a noughts-and-crosses/tic-tac-toe pattern that goes right up to the edges of the printable area, and check that the lines are straight.

    Thanks. I'm on a 0.1mm height calibration object right now around 130mm radius and it's looking pretty good.


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