They will be printed, not casted. I'm looking at picking up a printer for myself but for now do have access to one. The samples I have seen from it are pretty good, I have never been impressed with Shapeways fuzzy looking prints and these have been much better. After seeing them, I finished up my replacement head and will be getting it printed in a week or so. If I'm happy with it then will start working on other projects. Just wanted an idea for what pieces are needed