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Unresolved Stringy Layers

Discussion in 'Troubleshooting' started by Michael Miller, Jun 27, 2016.

  1. Michael Miller

    Michael Miller New Member

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    I test printed a cube, cube and pyramid and all printed great to the correct dimesions. See the box in the picture below. The next picture is a part that I am trying to print out and it is string and breaks apart. Have no clue why one part prints one way and bad the next time. Any help would be great!
     

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    #1 Michael Miller, Jun 27, 2016
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    That can be either a bad model or something wrong with the print settings.
    Since the others look good I'd suspect the model.

    However, that is a hollow model which means that slicer settings around wall thickness and layer size matter.
     
    #2 mark tomlinson, Jun 28, 2016
  3. Michael Miller

    Michael Miller New Member

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    I print this same model on other robo3d printers and they print perfectly.
     
    #3 Michael Miller, Jun 28, 2016
  4. Geof

    Geof Volunteer Moderator
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    Season the hotend. Also that looks like the sample blue filament? Possibly try using a different spool. I do suggest for PLA (as many others do as well!) to print and oiler from thingiverse and use it whenever running pla as it likes to jam up and clog and just not work so great :D . My vote is mode issue or micojams from not being seasoned.
     
    #4 Geof, Jun 28, 2016
  5. Michael Miller

    Michael Miller New Member

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    It seems like it is printing good but is almost skipping a layer when printing. I will try to get some video.
     
    #5 Michael Miller, Jun 28, 2016
  6. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Yes, it looks like junk... it is clearly not working as far as printing and something is off with the Z height.

    But...

    If it were the printer (hardware/firmware) You would see that on any model that is the same dimensions (at least the same height).
    Clearly that is not the case. So that rather rules out a pure mechanical failure of the Z axis.

    There are other differences though, this is not a solid model and your test ones are.
     
    #6 mark tomlinson, Jun 28, 2016
  7. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    P.S. I assumed the good test models were recent/current prints and not from, say, before you made changes?
     
    #7 mark tomlinson, Jun 28, 2016
  8. Michael Miller

    Michael Miller New Member

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    they were made back to back. I will try one with a hollow center.
     
    #8 Michael Miller, Jun 28, 2016
  9. Michael Miller

    Michael Miller New Member

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    Here is a couple pictures of first layer... looks good.
     

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    #9 Michael Miller, Jun 28, 2016
  10. Michael Miller

    Michael Miller New Member

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    Here are some pictures of it when it fails...
     

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    #10 Michael Miller, Jun 28, 2016
  11. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Well, that is inter-layer bonding failing.
    I would try slowing it down, but sanity check that your layer heights and wall thickness are sane as well.
    Lastly it might be temperature related, you could be a bit cold.
     
    #11 mark tomlinson, Jun 28, 2016
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