Possibly the top example of a demonstration project of this concept is from a company that I have some familiarity with, as I took a tour of their facility a few weeks ago.
The company is Branch Technologies, and it is HQ’ed in Chattanooga, TN.
They won some money in a NASA competition regarding 3D-printing habitats in space.
(Link to that here - https://www.nasa.gov/press-release/nasa-awards-400000-to-top… )
Here is a link to the 3D printed home project that remains in progress:
https://archpaper.com/2019/02/branch-technology-3-d-printed-…
Branch is still a private company, so no public equity is available. I am not familiar with their current funding desires/needs, but they do have a fair amount of venture funding already.
volfan84
(not employed by Branch Technologies, but from all interactions with their founder, I would be quite intrigued to work there)