Couldn't convert imported feature into stl/obj formats

[cloni]

I'm trying to convert a huge engine model into stl or obj file formats. stl conversion is getting aborted while obj converted files have no geometry inside. I noticed that these cases happens only if the part/assembly i'm converting is an imported feature/copy geometry. How to fix this

[BenLoosli]

Probably because the imported feature is not a solid body, but a surface model.

STL need the solid model to export.

Try to solidify the surfaces from the imported part, then do the STL.