Hi, I have a Subdivision object that I have removed a shape with Subtract Solid. It is now a Solid Subtraction. I need the shape to be a solid shape for 3D printing. How do I fill it in or make this edit keeping it as a solid. This is a screen shot of the area I would like to fill... There are 2 parts here (green) that i 'Add Surfaced' together but I could split them and do it in 2 x parts. Hope this all makes sense. . Thank you.