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Solved Z scraping the print

Discussion in 'Troubleshooting' started by Robert T Loewen, Nov 14, 2016.

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  1. Robert T Loewen

    Robert T Loewen Member

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    Not quite sure what's going on here but my z offset is 1 [​IMG] this is the LCD case for the rip rap xxl screen with Sd card reader


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    #1 Robert T Loewen, Nov 14, 2016
    Last edited: Nov 14, 2016
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Assuming that the print was on the bed that same way (X axis is left to right) then you do not have the X level.
    "Autoleveling" you say "Nope" I say -- autoleveling requires the X to already be darn near flat* :)





    *probably missed that in the manual (along with the entire manual being missing)
     
    #2 mark tomlinson, Nov 14, 2016
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  3. danzca6

    danzca6 Well-Known Member

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    z offset is 1? What slicer are you using and how exactly are you setting it? you should be seeing M565 Z-1.0 in the top of the gcode if you were to save it off and view. Shouldn't be positive.
     
    #3 danzca6, Nov 14, 2016
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  4. Robert T Loewen

    Robert T Loewen Member

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    I will re measure the x rods from the print bed and report the difference


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    #4 Robert T Loewen, Nov 14, 2016
  5. Robert T Loewen

    Robert T Loewen Member

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    Matter control[​IMG]. There are my settings

    Height difference is 2.49 mm from left side of bed to right with the print head in the home position of x120 y127 and z-1

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    #5 Robert T Loewen, Nov 14, 2016
    Last edited: Nov 14, 2016
  6. danzca6

    danzca6 Well-Known Member

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    ok, so that could be wrong since you really want a negative number like -1. Try this, export the gcode of the model to a file and open it with a text editor. Search for M565 and see if you find that line to make sure it is there and that it is set to a negative value. I just have mine hard coded in the startup script and ignore the built in settings.
     
    #6 danzca6, Nov 14, 2016
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  7. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Yes, it needs to be negative, but you are spot on that MatterControl may already be translating that to negative. Or, it may not even be using the M565 (other slicers do it in funny ways also)
    Sorry, don't know either :( Your approach to testing it is the best one.

    The M565 is the best approach
     
    #7 mark tomlinson, Nov 14, 2016
  8. Robert T Loewen

    Robert T Loewen Member

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    M565 is not showing in the g code but I have added it to the starting gcode


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    #8 Robert T Loewen, Nov 14, 2016
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  9. danzca6

    danzca6 Well-Known Member

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    And it now shows in the gcode right? you put it after the G28 and before the G29 command?
     
    #9 danzca6, Nov 14, 2016
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  10. Robert T Loewen

    Robert T Loewen Member

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    Yup re exported a couple items and opened them in notepad to be sure and now it's there


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    #10 Robert T Loewen, Nov 14, 2016
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  11. danzca6

    danzca6 Well-Known Member

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    awesome...I think that will help you a lot. Try a print using that. You may need to adjust down or up depending on the first layer and adhesion.
     
    #11 danzca6, Nov 14, 2016
  12. Robert T Loewen

    Robert T Loewen Member

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    Sending a print now. Still plenty of material left


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    #12 Robert T Loewen, Nov 14, 2016
  13. Robert T Loewen

    Robert T Loewen Member

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    Little too high. Dropping the nozzle down to z-0.9

    Still a bit high adjusting to z-0.8
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    #13 Robert T Loewen, Nov 14, 2016
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  14. Geof

    Geof Volunteer Moderator
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    Keep tweaking and youll get there.
     
    #14 Geof, Nov 14, 2016
  15. danzca6

    danzca6 Well-Known Member

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    Get too close to 0 and you might have an extrusion problem or need an oiler for the PLA if that is what you are printing with.
     
    #15 danzca6, Nov 14, 2016
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  16. Robert T Loewen

    Robert T Loewen Member

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    Yeah I plan to print one of those anyway also z is -0.7 currently and first layer is looking pretty good. And I have dropped the speed to 62% to see if that helps any


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    #16 Robert T Loewen, Nov 14, 2016
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  17. Robert T Loewen

    Robert T Loewen Member

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    So far not hearing any scraping but the print is in early stages but will conrinue to monitor it


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    #17 Robert T Loewen, Nov 14, 2016
  18. danzca6

    danzca6 Well-Known Member

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    You are on your way. You'll love the LCD. Use mine all the time.
     
    #18 danzca6, Nov 14, 2016
  19. Robert T Loewen

    Robert T Loewen Member

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    Yeah only pain is I have to re export all the items I wanted to print back to the sd card


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    #19 Robert T Loewen, Nov 14, 2016
  20. Robert T Loewen

    Robert T Loewen Member

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    And it would seem I have a firmware update pending


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    #20 Robert T Loewen, Nov 14, 2016
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