I think that the 3d printing "Savings" as they work at this point of time are limited when it comes to housing. Current 3d printing technology is changing the building process of the framing of the house from wood framing to poured concrete (concrete is still poured whether into a mold or via machine). This does not make drastically change the amount of work or cost of finishing (basically everything interior), basements, plumbing, electrical, permitting, etc. This is where the bulk of the cost, labour and time is in house construction.
Framing costs are around 10% of a houses build cost and framing of a house can be completed in a week with a crew of around 4-6 people. Some of the panels/trusses can be factory cut significantly reducing wastage.
Just switching to 3d printing isn't going to make housing cheap on its own.
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