I'm not able to turn my shelled shape back into a solid

I shelled my shape and then saved it, but I now want to turn it back into a solid/remove the shelling (completely closed polysurface) but I don’t know how. (I had a previous problem with filleting my shape, and apparently filleting the shape as a solid will work before shelling it).

If someone could do it/tell me how to do it, I would be really grateful!

abstract rock.3dm (7.5 MB)

Hi Sara - Use ExtractSrf with the Copy option set to No and select the bottom surface. Delete that surface. Delete the inner object. Cap the remaining object.

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