MIT’s “MultiFab” 3D printer can print 10 materials at once

3-D printing is great, assuming you're printing one material for one purpose, and that you’re fine with a few do-overs. But the technology is still far behind in reliably producing a variety of useful objects, with no assembly required, at a moderate cost.
https://www.youtube.com/watch?v=xxdnFjfMiik&list=PLK2ccNIJVPpB_XqWWq_oaZGIDzmKiSkYc