Is anyone still using 5-point bed compensation?


  • administrators

    ...because I'm thinking of removing it from the RRF 3.01 release. The recommended replacement is 3x3 mesh bed compensation, although that doesn't allow you to set trigger height corrections (G30 H parameters) on each point.



  • @dc42 is this something like G30 S5 where its supposed to execute (at least on non-deltas) adjustments to the bed plane (live levelling)? I was planning on giving it a try (because it covers more of my large bed vs just 3 point i'm currently using) but if there's an option to use a 3x3 grid (9pts) instead of 5pts to tram my bed, no worries.


  • administrators

    @Luke-sLaboratory said in Is anyone still using 5-point bed compensation?:

    @dc42 is this something like G30 S5 where its supposed to execute (at least on non-deltas) adjustments to the bed plane (live levelling)? I was planning on giving it a try (because it covers more of my large bed vs just 3 point i'm currently using) but if there's an option to use a 3x3 grid (9pts) instead of 5pts to tram my bed, no worries.

    Yes.



  • @dc42 Neat! I have no issues with dropping 5 point if it means we can use a mesh to retilt the bed.

    Is the mesh option for live-level a current feature, or something that will be added in 3.01 under G29 (or similar)?


  • administrators

    @Luke-sLaboratory said in Is anyone still using 5-point bed compensation?:

    @dc42 Neat! I have no issues with dropping 5 point if it means we can use a mesh to retilt the bed.

    Is the mesh option for live-level a current feature, or something that will be added in 3.01 under G29 (or similar)?

    I think you are asking whether it will in future possible to load a height map, then probe a small number of points and have RRF superimpose a tilt on the height map according to the result. If so, then yes I am considering adding such a feature, which would make use of the existing code for bed compensation based on 3- and 4-point probing. But 5-point probing doesn't fit into that scheme.



  • @dc42 said in Is anyone still using 5-point bed compensation?:

    I think you are asking whether it will in future possible to load a height map, then probe a small number of points and have RRF superimpose a tilt on the height map according to the result. If so, then yes I am considering adding such a feature, which would make use of the existing code for bed compensation based on 3- and 4-point probing. But 5-point probing doesn't fit into that scheme.

    I'm not looking for a superimposed tilt on the mesh, I'm looking for using a mesh to inform the live-level feature (could be a coarse 3x3 or 5x5 mesh) before a detailed "surface map" mesh is used. Just to be clear, instead of using individual points like in the tutorials here: https://duet3d.dozuki.com/Wiki/Bed_levelling_using_multiple_independent_Z_motors I'd like to be able to specify the mesh to use for calibration like

    M557 X15:600 Y15:600 P5:5 ; Set mesh for bed auto-tilt
    G29 S0 A1 B3 ; Probe New Mesh, use for autocalibration, 3 motors,
    

    This (in theory) would use the same technique as current bed levelling w/ multiple independent z-motors to calulate the movement needed, but would greatly simplify user inputs.

    for a cherry on top, could build in similar z-probe features like results must be within XXX variation and YYY maximum amount of tries to get that, similar to what conditional scripts are doing today.


  • administrators

    We were talking about different things. It will still be possible to use 5 points when doing bed tilt correction using independent Z motors.



  • @dc42 Thanks for the explanation, sounds good.

    Would be pretty neat to be able to use a mesh for live levelling though! 😁


  • administrators

    @Luke-sLaboratory said in Is anyone still using 5-point bed compensation?:

    @dc42 Thanks for the explanation, sounds good.

    Would be pretty neat to be able to use a mesh for live levelling though! 😁

    Why?



  • Greatly would simplify setting up the bed.g macro and aid in understanding (at least for me!) - once you know how the mesh works, you know how both live-levelling and mesh compensation work.

    Purely convenience. I haven't touched my bed.g in a few months.


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