Idk if it's related, but when I was making a designing blender, and there was a face inside the object, the entire section from the top of the face to the bottom of the face would get wiped
OP, open it in blender and see of there are doubled faces, or something clearly not right in the model
It's either a non-manifold model and/or it's got flipped normals. The slicer doesn't know which faces of the model are inside/outside so it's confused.
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It's a geometry problem. The object might be made with "surfaces" instead of "parts/pieces".
In summary, some parts are not solid and don't have volume, so the slicer can't slice it.
To fix it, I normally use Microsoft's 3D builder. It checks the object, detects the issues and tries to fix it. It's not perfect but can help with most things.
This will be a hard one to fix. Hope you get it done!! This is a masterpiece, mate. I really want this STL 😂😂
This model makes me feel uncomfortable