1. Got a question or need help troubleshooting? Post to the troubleshooting forum or Search the forums!

Unresolved holes in the Gherkin

Discussion in 'Troubleshooting' started by Monder, Sep 22, 2016.

  1. Monder

    Monder New Member

    Joined:
    Jun 8, 2014
    Messages:
    23
    Likes Received:
    2
    hello,
    i download it the Gherkin from thingiverse.com the file looks good, but when I print it i get holes between the Xs and that cause week structure and collapse.
    PS. i saw picture of others the print were great!

    nozzle - 0.25
    layer height - 0.15
    fill density - i tried everything
    support off

    Thanks in advance :)
     

    Attached Files:

    #1 Monder, Sep 22, 2016
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    23,914
    Likes Received:
    7,338
    Were the others printed at that nozzle size and layer height?

    Not sure which slicer you are using, but this is likely their fault.
    You may be hitting some 'impossibles'* when you slice due to the resolution.

    I would experiment with slicing it at different resolutions to see if the slicer output improves.
    But first I would try just a totally different slicer to see if it misbehaves the same way.

    Also, make sure you run the model through a repair facility and be sure there are no artifacts in there.


    *these are places where the slicer drops the ball and essentially 'divides by zero' -- you get the idea. It can't generate the output correctly given the input parameters.
     
    #2 mark tomlinson, Sep 22, 2016
    Geof likes this.
  3. Monder

    Monder New Member

    Joined:
    Jun 8, 2014
    Messages:
    23
    Likes Received:
    2
    thanks for answering @mark tomlinson
    yes and i get great result,

    I tried Slic3r, cura, matterslice and Simplify3D

    I tried different resolutions but the same result or even worse

    and about the repair part the Simplify3D and 3d builder (win10) did not found any

    in the website there is some who Succeed, I attached pic of their work
     

    Attached Files:

    #3 Monder, Sep 22, 2016
  4. Geof

    Geof Volunteer Moderator
    Staff Member

    Joined:
    Nov 9, 2015
    Messages:
    6,757
    Likes Received:
    2,339
    I would run it through netfabb or azure and see if has errors.
     
    #4 Geof, Sep 22, 2016
    Monder likes this.
  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    23,914
    Likes Received:
    7,338
    At least we can rule out a slicer specifically. So you might be getting an impossible geometry issue.
    One example of that would be an wall too thin for a nozzle to print (probably not your case, just an example, but that is an example of an impossible geometry for a slicer.)

    So play with layer heights and nozzle sizes to see a what point you can get the slicer to generate correctly. I would focus on using S3D (mostly because it is a generally better slicer and faster). [You could also ping their support line and see what they suggest.]

    I think you will find a point where the model does get sliced correctly fairly quickly. If you knew what settings the others used that would be a good start.
     
    #5 mark tomlinson, Sep 22, 2016
    Monder likes this.
  6. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    23,914
    Likes Received:
    7,338
    Most slicers will simply 'discard' any impossible data points during the slice which then leaves you with a gap in the model
     
    #6 mark tomlinson, Sep 22, 2016
  7. Ryan TeGantvoort

    Ryan TeGantvoort Active Member

    Joined:
    Mar 11, 2016
    Messages:
    343
    Likes Received:
    172
    Just downloaded the Gherkin, since it looked like a pretty cool thing to print out. I think its the same version you have, as the others had solid walls. I tried slicing right away and received the same issues you are experiencing.

    When I used "Identify Self Intersecting Surfaces" under the "Repair" drop-down (S3D), I received multiple problem areas. See the image Untitled.png.

    Ran the STL through NetFabb and now only a few problem areas. See image Untitled2.png. But it slices just fine now. See image Untitled3.png.

    This is a very common issue I have found with other peoples STL files. I have either reverse engineered their STLs or just run through NetFabb which fixes most issues.

    Try the STL file I uploaded and I bet it fixes your issues as well.
     

    Attached Files:

    #7 Ryan TeGantvoort, Sep 22, 2016
    Geof, Monder and mark tomlinson like this.
  8. Ryan TeGantvoort

    Ryan TeGantvoort Active Member

    Joined:
    Mar 11, 2016
    Messages:
    343
    Likes Received:
    172
    It says the fixed file is too large to upload. Sorry.

    Just upload to https://netfabb.azurewebsites.net/ and it will repair the STL. You just need a Microsoft Login to use it.
     
    #8 Ryan TeGantvoort, Sep 22, 2016
    Monder likes this.
  9. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    23,914
    Likes Received:
    7,338
    I should have been more specific :)

    Thanks @Ryan TeGantvoort !
     
    #9 mark tomlinson, Sep 22, 2016
    Ryan TeGantvoort likes this.
  10. Ryan TeGantvoort

    Ryan TeGantvoort Active Member

    Joined:
    Mar 11, 2016
    Messages:
    343
    Likes Received:
    172
    #10 Ryan TeGantvoort, Sep 22, 2016
    mark tomlinson likes this.
  11. Monder

    Monder New Member

    Joined:
    Jun 8, 2014
    Messages:
    23
    Likes Received:
    2
    #11 Monder, Sep 22, 2016
    Geof and mark tomlinson like this.
  12. Ryan TeGantvoort

    Ryan TeGantvoort Active Member

    Joined:
    Mar 11, 2016
    Messages:
    343
    Likes Received:
    172
    No problem glad we could help!
     
    #12 Ryan TeGantvoort, Sep 22, 2016

Share This Page