Yes, I do know that in both instances there has to be the insert made, but just curious about combining the two processes?
It's already being done. It's also kinda the point. Why make a spring this way when springs are stronger and more economically produced by current methods? You don't, you combine the elements. We don't make windows entirely of glass, we only use glass for the transparent part.
This method does not replace other materials or methods that are stronger, faster or more economical. It enables us potentially to build some parts out of some materials that could not be made economically any other way. I don't think it will be so useful in making firearms as in the medical, aerospace, defense, entertainment and other industries.