It's a firewall, so a fairly complicated surface. It tells me "the offset distance might be greater than the radius of curvature of the face or the offset face might intersect itself." Is there any other way for me to extrude the part? It doesn't have to be all that thick either, but I need a workable solid.
Also, "Extrude Facet Body" didn't work for me in the first place for some reason, it doesn't give me errors, previews, anything.