I downloaded corrupted parts.

before this assembly that I downloaded from the site when I turn now lost more than half of the cases. and half or hollow parts ballin I download. What causes this?

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2 Answers

It looks like its a surface model. Surfaces don't have any thickness and hence you are seeing it as hollow.

 
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is in addition to previous state and the current state of the component. this may have caused?

 
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