3D printing a house is starting to be open sourced
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Unfortunately, projects like these are where "makers" and engineers part ways. It's the boring bits of engineering that always get people: costs, safety standards, and scalability. In this case, for example, where does the foundation for the house come from? You can't 3D print it. You need an earth mover or a bunch of Mexicans with shovels to dig it out. Ok there goes one of your biggest costs. Now on to printing your house. Concrete is pricey even before you create a fancy mix design that can be extruded and not slump. Any cost savings here? probably not. Now your house needs a roof. Well, if you can't print overcuts with plastic you're not doing it with concrete, so a standard truss it is. Again, no cost savings. If you've got this far, you haven't saved any money and we don't even know if your house will pass structural/safety muster. I hate to be a downer, but a lot of these idea are just bad. If you want cheap construction, we'll have to look elsewhere.
Immigration. This is a real kicker. Folks living in large coastal cities can't see it because for better or worse they are used to the faces they see every day being multi-ethnic. If you live in a smallish American city, you can see it in real time. Without getting into any racial politics, if you live in a city that was lily white 15 years ago and today it is filled with Spanish speaking immigrants, you know that something has changed.
If you look at the housing situation in these small cities, the "poorer" parts of town that used to be a family's first option for a starter home are filled with illegals renting from boomers and yuppies. South Park's "they took our jerbs!" is a lot less funny on the housing side of economics if you're a tax paying working class American trying to find a home for your family.