This guy is thinking really far out man, he thinking of making giant 3D printers to make houses in 20 hours. I believe its a good idea, it give people houses however it may put people out of a job. He does put up good points in his video, not enough houses and too many slums in the world. The thing is a giant 3D printer ? how will you get the printers to those poverty areas. I find making houses at a fraction of a cost and stability sounds good. They may look different and may not be as big, but for people who don't have a house and are living in dirt, it would be a very good idea. Not to mention giant 3d printers can build anything. Hell 3D printers making cars, planes?
Also it seem it would be beneficial to mars and moon missions. Making giant prefab houses in hours. So what do you guys think? Oh it turns out you can make really curvy houses with the machien too