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Print is Cutting out one part because of supports, Maybe due to the print being hollow.


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Posted · Print is Cutting out one part because of supports, Maybe due to the print being hollow.

My Elegoo Neptune 3 Pro and in Cura is showing that this file is hollow and so the unsupported parts in the hollow sections are overwriting some other parts in order to get supports I think. Is there a way to fix this or make it not hollow? When actually printing it isnt hollow, but the supports do overwrite some parts.

image_2025-01-24_083428932.png

Screenshot 2025-01-24 083109.png

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    Posted · Print is Cutting out one part because of supports, Maybe due to the print being hollow.

    Actually I think I just found the solution, but if anyone was wondering I put it through Windows 3D Builder which automatically fixed it, but I believe made it slightly wrinkly which is odd.

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    Posted · Print is Cutting out one part because of supports, Maybe due to the print being hollow.
    1 hour ago, McDazzle said:

    Actually I think I just found the solution, but if anyone was wondering I put it through Windows 3D Builder which automatically fixed it, but I believe made it slightly wrinkly which is odd.

    That almost means your model was invalid in some way - you may need to check how it gets exported from whatever program you're using.

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    Posted · Print is Cutting out one part because of supports, Maybe due to the print being hollow.
    9 minutes ago, Slashee_the_Cow said:

    That almost means your model was invalid in some way - you may need to check how it gets exported from whatever program you're using.

    As in just a rough look to make sure that everything is up to scratch?

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    Posted · Print is Cutting out one part because of supports, Maybe due to the print being hollow.
    9 minutes ago, McDazzle said:

    As in just a rough look to make sure that everything is up to scratch?

    The most common problem is missing faces. In Cura, in Prepare mode, if you see any polka dots anywhere, that indicates a missing face.

     

    If you post your STL file I can have a look at it and see what could be a problem.

     

     Props for using 3D Builder to fix it though - that's usually in the instructions I give people 😄

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    Posted · Print is Cutting out one part because of supports, Maybe due to the print being hollow.
    38 minutes ago, Slashee_the_Cow said:

    The most common problem is missing faces. In Cura, in Prepare mode, if you see any polka dots anywhere, that indicates a missing face.

     

    If you post your STL file I can have a look at it and see what could be a problem.

     

     Props for using 3D Builder to fix it though - that's usually in the instructions I give people 😄

    Here you go! 

    helmet_front_left (1).stl

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    Posted · Print is Cutting out one part because of supports, Maybe due to the print being hollow.

    So the problem is missing faces:

    image.thumb.png.f174117f8fe88a6b5fe33aba2159021a.png

    All along that edge, you can actually see inside the model. The polka dot areas is how Cura shows the wrong side of faces (the "right" side being visible on the outside) and inside the model you can make out the back sides of the rest of it.

     

    How to fix it (I mean when turning it into an STL, not afterwards): Depends on what program you're using. SketchUp is notorious for producing broken STLs and the fix is "don't use SketchUp". Blender isn't great at it, but I think you can fix it in Blender (just don't ask me how). Ideally when designing stuff to be 3D printed you want to use a CAD program, but they make it pretty hard to do organic geometry (like it's been sculpted - like this).

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    Posted · Print is Cutting out one part because of supports, Maybe due to the print being hollow.
    46 minutes ago, Slashee_the_Cow said:

    So the problem is missing faces:

    image.thumb.png.f174117f8fe88a6b5fe33aba2159021a.png

    All along that edge, you can actually see inside the model. The polka dot areas is how Cura shows the wrong side of faces (the "right" side being visible on the outside) and inside the model you can make out the back sides of the rest of it.

     

    How to fix it (I mean when turning it into an STL, not afterwards): Depends on what program you're using. SketchUp is notorious for producing broken STLs and the fix is "don't use SketchUp". Blender isn't great at it, but I think you can fix it in Blender (just don't ask me how). Ideally when designing stuff to be 3D printed you want to use a CAD program, but they make it pretty hard to do organic geometry (like it's been sculpted - like this).

    Thank you! I didn't actually make the files, got them off Thingiverse, but wanted to have a good response to any other files I come across that shared this issue. Thank you!

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