Yep, 3D printing can make really nice custom boxes and enclosures with mounting bosses, holes, and even lettering and labels. Unfortunately nobody makes custom injection molded boxes that are appropriate unless you go with the plain Budd boxes and spend days laying out and cutting. At least with 3D printing you tell it to print and you can do other stuff. There are companies that will cut and letter faceplates of various thicknesses but that can get expensive for small runs. I’d bet 3D printing is the best solution for now if you are able to keep up with orders.