Interesting process but it isn’t the answer to homelessness.
A “printed” house only creates a wall, you still need doors, windows, floors and a roof. Not to mention heating, air conditioning, electrical and plumbing. And you end up with a butt ugly building.
Many homeless aren’t going to be able to handle living in a house, the maintenance would be beyond them. Besides, they also need to be provided with jobs and training which just as important.
Multi unit housing makes more sense for many homeless.
A much better solution would be putting homeless to work (those physically able) building housing thus learning a trade and gaining a home.
Seriously, CMU goes up fast too. I haven’t run the numbers but CMU is problem as cheap, if not cheaper.