Clarification on delta calibration

  • The wiki says :

    Setting up the bed.g file
    The bed.g file defines the points that will be probed, and the number of factors that will be calibrated. RepRapFirmware supports the following calibration schemes:

    4-factor: Similar to traditional manual delta calibration, but much faster. Adjusts the endstop switch position corrections (M666 XYZ parameters) and the delta radius (M665 R parameter).
    6-factor: as 4-factor but also adjusts the X and Y tower position corrections.
    7-factor: as 6-factor but also adjusts the diagonal rod length (M665 L parameter).
    8-factor: as 6-factor but also adjusts the X and Y tilt angles (M666 A and B parameters).
    9-factor: as 8-factor but also adjusts the diagonal rod length (M665 L parameter).
    For typical delta printer builds, 6-factor is best. You should be able to measure the diagonal rod length accurately enough, and for auto calibration to be able to determine it accurately, you need probe points that are well outside the triangle formed by the towers. Likewise, without points well outside that triangle, auto calibration cannot accurately distinguish the effect of bed tilt from misplaced towers.

    So does 8 factor also calibrate the rod length?

    I'd like to calibrate everything except rod length (to manually adjust to get accurate x/y dimensions). What is the best way to do that?

  • administrators

    Nope from reading that you need 9 factor if you want the tilt angles and rod length else use 7 factor for the rod length

    Edit: best way to do everything except for rod length is to use 8 factor

  • Thanks Tony.

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