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Why does Cura fill empty space?

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Posted · Why does Cura fill empty space?

I'm new to 3D printing and Cura.

I have designed a Mobius strip shape in Blender, as in attached "Mobius_blender.PNG" screenshot and STL file.

Obviously there is a hole through the middle of this shape.

When I slice the model in Cura, the hole through the middle is filled in. See the yellow part in the middle of the attached "Cura_slice.PNG" and "Cura_slice2.PNG".

This happens with default settings and preferences, supports on or off, and several other variations in attempting to fix it.

I know I will need supports to make this print properly, but why does Cura fill in the middle section?

Thanks in advance for any help or advice.





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    Posted · Why does Cura fill empty space?

    Your model is bad.


    It has no faces on the inside:



    Also it looks like the normals are flipped where it joins:



    If you're on Windows then Microsoft's 3D Builder app is actually pretty good at fixing broken models. On other platforms you could try something like FreeCAD or MeshLab, but they're a lot more complex. There's also online tools that can fix models. I've attached a fixed version (from 3D Builder) because I can't help but help 🙂


    Blender isn't always the best at exporting STL models (CAD software is) so sometimes it works fine, sometimes you have problems. Sorry but I don't know enough about Blender to help try and avoid his happening 😞


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    Posted · Why does Cura fill empty space?

    Thank you for the tips and fixed model. I did not imagine the source STL could be wrong.

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