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Slicing problem - one layer of stringing


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Posted · Slicing problem - one layer of stringing

I have 2 cones that I need to print a large one and a small one. I have drawn both in FreeCad and they render fine.

 

I load them into Cura V4.8 and they load and slice fine.

 

With the large cone on layer 20 suddenly I get a single layer that goes across the whole of the cone and then the next layer above all is fine.

 

With the small cone I get exactly the same thing on layer 77.

 

Any suggestions as to what may be causing this issue?

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    Posted · Slicing problem - one layer of stringing

    Ok, I haven't seen something in the preview. Which layer height have you used? Maybe I can reproduce it.

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    Posted · Slicing problem - one layer of stringing
    42 minutes ago, Valkrider said:

    FreeCad says it is fine.

     

    How are these objects made in FreeCAD?

    It doesn't look good at all. Nothing more than a few thousand "flying" triangles that are not connected.

    In addition: The wall is razor-sharp at the tip. Which kind of printer can build this...?

     

     

    grafik.thumb.png.bbcb22a04096254d14ed596c23880edb.png

     

    grafik.thumb.png.09ef7a733e675b979eb7c4c3243bf318.png

     

    It should look like this:

     

    grafik.thumb.png.4a9f4fb6530f0300d2ec884279f67af9.png

     

    cone3.b.stl

     

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    Posted · Slicing problem - one layer of stringing

    My layer height is 0.2mm.

     

    The wall is not razor sharp at the tip it is flat with a wall thickness of 0.8mm and a hole in the top of 1.9mm.

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    Posted · Slicing problem - one layer of stringing
    11 hours ago, Valkrider said:

    The wall is not razor sharp at the tip it is flat with a wall thickness of 0.8mm and a hole in the top of 1.9mm.

     

    This may be valid for the larger one.

    There's a sharp edge on the tip of the smaller cone.

     

    Anyway - both models are broken and therefore results of slicers are unpredictable.

    If you don't have seen it yet - here is a comprehensive tutorial about preparing models with FreeCAD:

     

    https://yorikvanhavre.gitbooks.io/a-freecad-manual/content/working_with_freecad/preparing_models_for_3d_printing.html

     

    grafik.png.23b4048d2ca257e51793408b9492fa54.png

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    Posted · Slicing problem - one layer of stringing

    Can you explain what you mean by "both models are broken" please?

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    Posted · Slicing problem - one layer of stringing

    broken  =  not suitable for slicing...  so redesign or repair the designs to get the best result in slicing and printing!

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    Posted · Slicing problem - one layer of stringing
    7 hours ago, Valkrider said:

    Can you explain what you mean by "both models are broken" please?

     

    I quote myself:

     

    On 12/1/2020 at 9:21 PM, tinkergnome said:

    Nothing more than a few thousand "flying" triangles that are not connected.

     

    That's the opposite of a manifold geometry.

    You can load the stl files in Meshmixer (e.g.- like i did above) and it will show all mesh errors in different colors.

     

    Why is a manifold mesh important?

    https://www.sculpteo.com/en/3d-learning-hub/create-3d-file/fix-non-manifold-geometry/#Part-3

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    Posted · Slicing problem - one layer of stringing
    Quote

    You can load the stl files in Meshmixer (e.g.- like i did above) and it will show all mesh errors in different colors.

    I did this and didn't get the same result as you. All I ended up with was one red sphere

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    Posted · Slicing problem - one layer of stringing

    Vielen Dank

    ich habe im IN eine neue Variante gefunden, welche die neuen .stl dateien abschliesst!

    Bei meiner "SCHATZKiste" klappt es 1x bei 9 Versuchen!! Aber ich habe ja zeit 🙂

    Vielen Dank für die Unterstützung!

    Bleibt schön gesund 

    und ein frohes und besinnliches Weihnachtsfest!!

    fritzi

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