1.18 RC1 Bed levelling



  • Hi DC42 can you expand on the line in the release notes that says:

    M557 P parameter to set probing points is no longer supported. Use a bed.g file instead


  • administrators

    It used to be possible to do 3, 4 or 5 point bed probing without using a bed.g file, by defining the probe points in M557 commands. This was replaced by the use of a bed.g file 2 or 3 years ago; but if there was no bed.g file then the old way was still supported.



  • Ok thanks, if I may ask a further maybe stupid question, I have been using 4 point as per many previous posts, but have discovered that the bed coating I use severely affects the IR Probe trigger height, is there a way to save probing results from 4 point as there is with Mesh levelling?

    Also I think the Web interface may have an issue, if I click on the down arrow for auto bed compensation and select Mesh level nothing happens, if I gcode it it runs fine.


  • administrators

    The web interface issue is known and fixed in the release that chrishamm has under development.

    There isn't a way of saving the results of 4-point probing, but you can use 4-point mesh levelling instead.



  • Thanks again, I'll give it a try.



  • Hi DC42, struggling with four point mesh, I cant seem to figure out what to put in the M557 command to get it to go to the corners of the bed. I have a 28X 28Y offset to the probe and a 200x200 bed

    If I try
    M557 X0:160 Y0:160 S159 it tries then comes back with not enough points error


  • administrators

    If the probe offset is +28X and +28Y then the point 0,0 is not accessible to the probe unless the nozzle can move to -28X -28Y. So try probing from about 30 to 190 instead of 0 to 160.



  • Sorted, thanks for your help, settled on
    M557 X40:190 Y20:170 S150



  • Question,

    I was trying to set the bed mesh manually, i changed the points in the CSV. then saved it, then i set a M375.

    but from what i could tell nothing changed.

    I'm i doing this correctly? or is there another step?

    Thanks!

    ~Russ


  • administrators

    @Russ:

    Question,

    I was trying to set the bed mesh manually, i changed the points in the CSV. then saved it, then i set a M375.

    but from what i could tell nothing changed.

    I'm i doing this correctly? or is there another step?

    Thanks!

    ~Russ

    That should work, but use the 1.18 release of at least 1.18RC2. There was a bug in earlier versions when loading large height maps files.



  • ok, Ii will give it a go when I have troubles again, Thanks!

    ~Russ



  • Hi DC42, just found an oddity, for a laugh I did mesh levelling with:
    M557 X52:204 Y20:170 S12.5

    I then printed 4 x 10mm square 1mm high at the edges of the plate, each of the squares had each layer in the Y direction slipped by about 0.2mm

    Odd?


  • administrators

    @pcsentinel:

    Hi DC42, just found an oddity, for a laugh I did mesh levelling with:
    M557 X52:204 Y20:170 S12.5

    I then printed 4 x 10mm square 1mm high at the edges of the plate, each of the squares had each layer in the Y direction slipped by about 0.2mm

    Odd?

    Is it reproducible? If so, feel free to remind me about this about a week from now, when I should have time to look into it.


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