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Solved Print head height

Discussion in 'General Questions' started by Folk Hero, May 25, 2017.

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  1. Folk Hero

    Folk Hero Member

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    I didn't put this in troubleshooting because I'm pretty sure it's just stupidity on my part.
    I fire up the printer, load the PLA after the temps are where they should be. load the test circle to be printed and and hit print. It goes through calibration and then begins to print. The only problem is the print head is 6" above the bed. (but it does print a nice long string)
    Any help appreciated.

    Tim
     
    #1 Folk Hero, May 25, 2017
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    One or both of the Z axis home switches is false-reporting HOME*.
    Watch the first video here for more details on how that all works:

    http://community.robo3d.com/index.php?threads/helpful-videos-novice-expert.7478/

    Actually they are all worth watching, but that one is more specific to your issue.


    *I suppose it is possible you have a silly Z offset defined somewhere, but my bet would be on the switches
     
    #2 mark tomlinson, May 25, 2017
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  3. Folk Hero

    Folk Hero Member

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    The videos nice but not really helping.
    I ran it again and noticed that each time it goes to one of the points on the bed for calibration it actually goes up a few turns after each positioning.

    Tim.
     
    #3 Folk Hero, May 25, 2017
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    One of the z switches is out of position or showing open ... That is how it knows to stop going down. When it sees that it goes up...

    Sent from my BNTV450 using Tapatalk
     
    #4 mark tomlinson, May 25, 2017
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  5. Geof

    Geof Volunteer Moderator
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    Mark is referring to the two microswitches under the x axis on the lead screws. Either one is mispositioned or unplugged, or plugged in incorrectly giving a false "home" trigger
     
    #5 Geof, May 26, 2017
  6. Folk Hero

    Folk Hero Member

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    That was the problem (figured it out about 3:15 this morning). When I had laid it on it's face to fix the power issue the switch moved just enough to not make contact.
    Thanks to all

    Tim
     
    #6 Folk Hero, May 26, 2017
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