I’m not sure if you’ve been following or not but 3d printed homes are becoming a reality and one just came up for sale in Riverhead, New York for half the price of a normal house in that area.
Check this out:
https://www.goodnewsnetwork.org/us-first-3d-printed-house-for-sale-in-new-york-zillow/
What size nozzle do you figure they were using to print this?