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Solved Printing shows Z offset

Discussion in 'Troubleshooting' started by Shigemal, Sep 5, 2016.

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  1. Shigemal

    Shigemal Member

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    [​IMG]

    This printer has auto levelchecking
    Recently firmware has been updated.
    So it makes some worse.
    Any suggestion?

    Regards
     
  2. Shigemal

    Shigemal Member

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    I am trying to confirm print again with right setting that makes new gcode for it.
    Using Mattercontrol with viewing start gcode script with confirming.
     
  3. danzca6

    danzca6 Well-Known Member

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    is this a public model that you are printing? I'm trying to get an idea of what it is supposed to look like
     
  4. Shigemal

    Shigemal Member

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    Thanks Danzca6
    It is printing parts screw of http://www.thingiverse.com/thing:1551236.
    So problem is on bottom side, this screw has been created matched on horizontal placement.

    regards
     
  5. Shigemal

    Shigemal Member

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    My start gcode setting is following.

    G28 X0 Y0 Z0 ; home all axes
    G1 Z5 F5000 ; lift nozzle
    M109 S[temperature] ; set the extruder temp and wait
    G28 X0 Y0 Z0 ; Home Z again in case there was filament on nozzle
    M565 Z-0.6
    G29 ; probe the bed
     
  6. Shigemal

    Shigemal Member

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    [​IMG]
    I had cancelled print because behavior shows on bottom as before.
     
  7. danzca6

    danzca6 Well-Known Member

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    Ok so your z offset looks like it could be ok, but the model is printing several layers up on the model than what it should be. So you are loosing the bottom X layers of the model. Is that correct? What software are you using to slice and print with? You may just have the model placed in the software partially under the build surface of the bed.
     
  8. danzca6

    danzca6 Well-Known Member

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    You may also need to print that part with it standing up if you have the room. With threads, it would be difficult to get a clean print laying on its side like that. May not be as strong that way, but might make it more printable.
     
  9. Shigemal

    Shigemal Member

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    [​IMG]
    Black one was created in before printer update.
    It was printer update on extruder so titan need to update marlin firmware for extruder step rate.
    Something struggle in firmware creation at that time so firmware may have some issue.
     
  10. danzca6

    danzca6 Well-Known Member

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    oh...so did you use the correct baseline firmware to make you e-step changes to? Maybe your z-steps are incorrect.
     
  11. Shigemal

    Shigemal Member

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    Yes bottom few layers are missing
     
  12. Shigemal

    Shigemal Member

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    2016-09-06.png

    Gcode may have right layer but printer does not output in place
     
  13. Shigemal

    Shigemal Member

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    Dear danzca6
    Z-e step may not have issue because top side print layer is correct.
    You can see it on black one (past) and yellow one (current).
    Just bottom layers are missing .
    Should I make recalibration for z-offset ?
    I have forgotten about process for it.

    regards
     
  14. Shigemal

    Shigemal Member

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    Dear danzca6
    Yes original design has stood up.
    But screw style of printing at Robo3D y-axis movement factor makes worse for it.
    I have another 3D printer as Replicator2x clone that has stable heat plate no x-y axis movement just z-axis moving.
    So that type of printer may perform it correctly.
    Printing target is PCB vise and it may not require strong grip power.
    horizontal screw design is not bad choice for this case.
    regards
     
  15. Shigemal

    Shigemal Member

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    My slicer is mattercontrol set .
    And it is performed through SD card bases.
     
  16. Shigemal

    Shigemal Member

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    [​IMG]

    Try result with M565 Z-1.5 shows better result (1.7mm)

    It is propagated from Z offset setting

    But caliblation result may not shows such value.

    Sense switch z endstop until make.
    And try to increase Z axis until free.
    It shows as 0.5-0.6mm.

    Need to understand on this cause.
     
  17. danzca6

    danzca6 Well-Known Member

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    I don't see that part in the list of parts for that model. They are all full threaded. None have cut offs on the top and bottom like your pic with the matter control.

    Your z offset just changes how close the first layer is onto the plate. Won't bring back or remove layers of the model.
     
  18. Shigemal

    Shigemal Member

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    I had tried to change z offset parameter on start gcode script.
    from Z-0.6 into Z-1.5
    and result shows better
    Sorry for make confusion, I had focused on bottom layer only, mid and right are cancelled print middle of the way.
    In addition infill rate has been changed too.

    Now I am looking into firmware side, M565 Z offset issue has not been handled in right way.
    I found some thread on this forum and try to conclude with change as its.

    regards
     
  19. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Entirely possible since there was no general agreement in the Marlin development community about how it should work. This is one reason why in current versions of Marlin the M565 is not supported. Still, the version of the firmware that Robo provides does implement it.

    The thing to keep in mind is that with M565 a more negative number was further from the bed and a more positive number was closer to the bed.
     
  20. Shigemal

    Shigemal Member

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    Thanks Mark
    I have reviewed thread of M565 issue .
    And negative z-offset of Robo3D mechanism is unique.
    regards
     
    mark tomlinson likes this.
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