Bed leveling question?



  • Ok my leveling probe cant reach the left 30mm of my bed so i was wondering what happens if i print there, does it just not compensate and if so is there anything i can do improve it short of moving the sensor?



  • it can only compensate for the area you can probe, but if the bed is reasonably flat and level then there should be a limit for how big a deviation 30mm can have.

    so make sure the bed is flat or reduce the offset. alternatively you could temporarily install the prove instead of the hotend to give yourselv zero offset to verify the whole bed is sufficiently compensated



  • @davidvh86 said in Bed leveling question?:

    Ok my leveling probe cant reach the left 30mm of my bed so i was wondering what happens if i print there, does it just not compensate and if so is there anything i can do improve it short of moving the sensor?

    Hi,

    What is preventing the probe from moving into that area?

    Thanks.

    Frederick



  • @fcwilt

    I converted a 3d systems cube pro duo and the x axis just cant go that far. The tool platform is a really goofy design, so the sensor needed to go a little further right that i wanted.


  • Moderator

    I could be remembering wrong, but I think that between the probed points the correction is interpolated, and outside of the points the correction is extrapolated. @dc42 would have to confirm or deny.

    https://duet3d.dozuki.com/Wiki/Using_mesh_bed_compensation

    If the heightmap.csv file contains a column of zeros at the start or the end, this indicates that the corresponding X coordinate was not reachable by the probe, taking account of the bed size specified in the M665 command on a delta printer or the M208 commands for other printers, and the probe offset specified by the X and Y parameters in the G31 command. Similarly, if there is a row of zeros then the corresponding Y coordinate was not reachable.

    If you are manually editing heightmap.csv note that the firmware uses 0.0 to mean zero height error and 0 to mean that the point was not probed so the height error needs to be extrapolated.



  • @Phaedrux said in Bed leveling question?:

    he correction is extrapolated. @dc42 would have to confirm or deny.
    https://duet3d.dozuki.com/Wiki/Using_mesh_bed_compensation

    If the heightmap.csv file contains a column of zeros at the start or the end, this indicates that the corresponding X coordinate was not reachable by the probe, taking account of the bed size specified in the M665 command on a delta printer or the M208 commands for other printers, and the probe offset specified by the X and Y parameters in the G31 command. Similarly, if there is a row of zeros then the corresponding Y coordinate was not reachable.

    awesome if thats true, moving the sensor would take a ton of time to redesign.


  • Moderator

    I don't know if this means that the M557 must be the entire size of the bed and therefore provoke the skipped points for it to get entered into the heightmap as 0 and cause it to extrapolate, or if it will automatically extrapolate any bed area outside of the M557 defined area.


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