Parts Disappearing from Design

Need help? We are here.
1

So when I export this file - which, for some reason, is 1.33GB - as an STL so I can print it, the freaking wheels disappear!

I don’t know if it matters but most of this is not unioned. This was deliberate so I can keep the components free to make sure they will align to an existing part after printing.

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image1485×772 89 KB

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image1646×797 144 KB

2

I assume you imported the model and deleted parts you don’t want for 3d print.

Usually happens when your model is not solid or normals needs to be flipped.

3

Why would you assume that? I didn’t deliberately delete anything.

4

Imported models sometimes are not solid or normals need to be flipped?