Need help with Project!

Hi everyone. I am a college student taking a basic digital fabrication class. We work with Rhino and I’m very new to it. I’m trying to extrude a curve but I want it to be a closed solid. But when I extrude it, it’s completely opened. It won’t even allow me to cap. I’m so confused.


The goal of this project is to recreate this shape.

If its not able to cap the curves are probably not planar. Use SetPT to ensure they are planar. Then run PlanarSrf and extrude, or extrude the curve with ExtrudeCrv and check Yes in the command line for the Solid option.