Unless you have specifically modeled an interior surface, and your model is literally, physically a shell, the output will be solid. To clarify, a 6 polygon cube with all polys facing out will be solid when printed. A 6 polygon cube with all polys facing out that has a second smaller cube inside it with all polys facing in…
You didn't miss it, and that question brings up a great point that we always try to explain to customers. Digital sculpting can be printed at multiple sizes. You don't always need to have your scale set in your modeling software to the exact measurement for the final. When modeling a 10 inch resin statue or a 8 inch vinyl…