prints coming out slightly too small delta printer



  • I did a test print of a 20mm cube and it was 20 mm but when I go bigger a 150 mm circle is 145mm

    I'm seeing all kinds of size problems but they are only a few mm out
    how can i sort this out

    my stepper motors are

    Product Name : Stepper Motor
    Model No. : 57HS5125A4
    Frame Size : 57 x 57mm (Nema 23)
    Step Angle : 1.8
    Rated Current : 2.5A
    [https://www.amazon.co.uk/gp/product/B074CT44Z6](link url)

    my motor config is

    ; Drives
    M569 P0 S1 ; Drive 0 goes forwards
    M569 P1 S1 ; Drive 1 goes forwards
    M569 P2 S1 ; Drive 2 goes forwards
    M569 P3 S0 ; Drive 3 goes forwards
    M350 X16 Y16 Z16 I1
    M350 E8 ; Configure microstepping with interpolation
    M92 X80 Y80 Z80 E1900 ; Set steps per mm
    M566 X1200 Y1200 Z1200 E6 ; Set maximum instantaneous speed changes (mm/min)
    M203 X18000 Y18000 Z18000 E2400 ; Set maximum speeds (mm/min)
    M201 X1000 Y1000 Z100 E100 ; Set accelerations (mm/s^2)
    M906 X1200 Y800 Z800 E400 I30 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout


  • administrators

    I suggest you print some grid lines to check whether the scaling is uniform or varies with position. Even a simple noughts-and-crosses/tic-tac-toe pattern big enough to cover the whole bed may be sufficient. If the scaling isn't uniform, the lines will be bent instead of straight. This is an indication that either the steps/mm or the configured rod length is out. You can check the steps/mm by measuring the height of a tall printed object.

    If the scaling is uniform, use M579 to correct it.



  • @dc42 said in prints coming out slightly too small delta printer:

    M579

    ok so if i am 4mm too big X and 1mm too big in Y
    how should the M579 Look


  • administrators

    @dmkmedia said in prints coming out slightly too small delta printer:

    @dc42 said in prints coming out slightly too small delta printer:

    M579

    ok so if i am 4mm too big X and 1mm too big in Y
    how should the M579 Look

    That depends on how long the print was in X and Y. If it was 100mm in both directions, you would need:

    M579 X0.96 Y0.99


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