Use extruded, revolved, and swept surfaces to create geometry. Trim, extend, knit, and thicken the surfaces to finish the thin-walled model. Extrude a sketch to create a surface. Revolve a sketch about an axis to create a surface. Trim a surface using a sketch or another surface as the trim tool. Sweep an open profile along a path to create a surface. Combine multiple surfaces into a single body using knit surfaces. Thicken a surface body to create a solid body.