This is crazy. invisible wall?

MakerWorld
1

strange.3mf (326.8 KB)
Please see attachment. I got an item that the middle supposed to be empty. but after slice, it’s solid. What’s going one?
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image

First time I see this strange issue.

2

The model is bad, you need to repair it before slicing. Then there is no problem:

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image572×537 74.2 KB

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