3D printing housing is exciting; I'm also optimistic about the future of modular architecture, in which walls (or even room-sized units) are manufactured and tr

3D printing housing is exciting; I'm also optimistic about the future of modular architecture, in which walls (or even room-sized units) are manufactured and transported to the construction site, plumbing/electricity already included, and assembled like Legos. Nexii (https://www.nexii.com/ https://www.nexii.com/) is working on something similar. It seems there are significant construction cost reductions, faster to build, and easier to repair, although the space of possible buildings is more limited than in the 3D-printed approach