Z Offset Issue with Pro

Discussion in 'Calibration, Help, and Troubleshooting' started by Steven Burns, Mar 27, 2016.

  1. Steven Burns

    Steven Burns Well-Known Member

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    I have an odd issue that hopefully someone can assist with.

    I just got my printer back from Livi (THANK YOU!!) and did a test print. The bed was a little high, but nothing to be concerned with.

    The print finished and I shut don the machine for a while and when I came back to do another print I had a strange z-offset issue. I did an Autohome and then a bed level and the nozzle was pushing fairly hard against the glass. I change the z-offset from -0.96 to -1.00, stored, and had the same issue. I kept making the z-offset larger and larger. It is now set to -4.00 and the auto-level is still pushing up against the bed. I would assume at this offset that the nozzle should be miles away from the bed.

    I have checked the sensor and it is wired correctly and trips as normal if I put a piece of paper or something under it.

    Any thoughts as to what might be going wrong all of a sudden?

    Thank you
     
  2. Mike Kelly

    Mike Kelly Volunteer

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    The "Autoleveling" system is a bit crap. I suggest modifying the firmware to use the Mesh leveling feature instead
     
  3. Steven Burns

    Steven Burns Well-Known Member

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    What settings do I change to do this? I am assuming I following the firmware flashing guide to download, change and then upload the new changes, but I need to know what values to change and where. Thanks
     
  4. Kick2box

    Kick2box Well-Known Member

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    in configuration.h do the following:

    //=========================== ManualBedLeveling ===========================
    //======================================================================

    #define MANUAL_BED_LEVELING remove comments here
    #define MESH_BED_LEVELING
    ...

    //======================================================================
    //============================ BedAutoLeveling ============================
    //======================================================================

    //#define AUTO_BED_LEVELING_FEATURE comment out here
     
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  5. Steven Burns

    Steven Burns Well-Known Member

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    Thank you. This was perfect. Can't wait to try this tonight and dump the darn probe as it gives me nothing but headaches.
     
  6. Steven Burns

    Steven Burns Well-Known Member

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    well I made the changes, compiled and uploaded the new changes. The new mesh bed level routines are in the menu and now I just need to go through the process and see how it works.

    Thanks for the help!!
     
  7. Steven Burns

    Steven Burns Well-Known Member

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    Last update for the night. I went through the mesh bed leveling steps and printed a 10X20 mm cube for a test. The layers are aligned perfectly with no top or bottom gaps. The cube measures 20.03mm x 20.07mm x 9.97mm high which is well within my tolerances.

    For a first print after getting the printer back from Livi I think this is a VERY good start. I need to adjust the first layer a bit as it is a little too squished for my taste, but I may switch to rafts for a bit and then it does not really matter.

    The mesh leveling is definitely the way to go and it really does not take very long. It took me about 5 minutes. The thing that it does do is get rid of the headaches of the IR sensor nonsense and move the sensor to strictly a Z-Stop, which is just fine.
     
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