Actually I agree with you, but of all the silly things you mentioned, the one-piece "Red" cassette has some potential. Metal printing is done (one way) by laying down a layer of the metal dust and then "printing on it with a laser to fuse the dust. Then the next thin layer of dust is laid down and so on. Cassettes aren't critical parts regarding safety, and they don't require a tremendous amount of strength, just lots of abrasion resistance. A printed cassette could work, at least for a little while. I will say this: it wouldn't surprise me to learn that SRAM printed steel prototypes of the Power Dome cassette to see how it looked and worked before actually cutting any. Brilliant idea!