Setting up Z probe



  • I eventually managed to load version 1.18 but I am still getting the; Error: Failed to load height map from file heightmap.csv: invalid grid error message. I have power cycled the printer quite a few times and web page reports the correct versions of firmware. What else can I try to see the heightmap? The heightmap.csv file cannot be read from the SD card when it is placed in the PC either.


  • administrators

    @Mike_F:

    The heightmap.csv file cannot be read from the SD card when it is placed in the PC either.

    That is why its not reading in the web interface. Maybe a new G29 to generate a new file to see if that sorts it.



  • I am doing a G32 S2 which should save the heightmap to a csv file. After doing the routine and issuing an M374 the file is saved and I get a report that the file has been saved. It is when I try to read it with an M375 that I get the Error: Failed to load height map from file heightmap.csv: invalid grid

    I have tried it many times since updating the firmware with the same result. I have verified that the heightmap.csv is on the SD card. Incidentally, a csv file should be able to be read from the PC and loaded into a spreadsheet but the PC cannot open the file either.


  • administrators

    G32 uses bed.g for bed levelling - the height map is produced by G29

    See

    https://duet3d.com/wiki/Using_mesh_bed_compensation



  • Okay, thanks for that. So where does G32 store the result?


  • administrators

    @Mike_F:

    Okay, thanks for that. So where does G32 store the result?

    In memory. So it's lost when you restart the firmware.



  • lol I thought I was the only one doing FSR like this 🙂



  • Tried a G29 and got an error message saying: Error: No valid grid defined for G29 bed probing

    Where and how do I define a grid and why can't it use the G30/32 grid?


  • administrators

    Mike

    This page has all the information:
    https://duet3d.com/wiki/Using_mesh_bed_compensation#Define_the_mesh_size_and_spacing

    G32 and G29 are currently different, I recommend using G29



  • stephenc,
    I have a Sintratec SLS kit that I use for various things and while I am still sorting things out with it I thought I would make an FSR holder for my much upgraded OpenBeam Kossel Pro.

    How do I upload pictures? Tried the picture icon but it asked if I wanted to leave the page and lose any info!!



  • Thanks T3P3Tony. Reading the right instructions helps a lot!!

    I set up the M557 and M558 and ran a G29 and produced a very nice heightmap, thank you. Are these M codes remembered once the printer is switched off or do they need to be put into a config file?



  • Add them at the end of the Config.g File and they will be remembered!



  • Thanks Dougal1957 - will do.


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