The copper levels are then processed by way of a chemical Option which removes any of the “resist” layer which wasn’t hardened because of the ultraviolet light-weight. This leaves hardened “resist” materials only over the desired copper traces and pads. A “seems-like” prototype doesn't have any electronics or features, but https://beaujfikl.blogoscience.com/34064337/considerations-to-know-about-electronic-prototype-construction