@Tony_Hine_Nifty_Acce I am finishing up the numbers on a 3D printed 3,500 sq foot cement house. Here is what I have so far.
Concrete cost between $75 and $90 per Cubic yard depending on grade.
With the contour crafting machine and a 1/2 (0.5) inch wall thickness (3 walls total). Two straight walls and 45 degree cross member ends up being roughly (1 + 1 + 1.414) * 0.5 = 1.707 cubic inches of cement, per square inch of vertical wall space.
It the wall thickness is greater than I estimate just change the 0.5 above (added) and below to what ever it actually is.
editted - added >>->
- one cubic yard of cement can create 189.8 sq ft of wall.
(36 in x 36 in x 36) in / 1.707 in^3/in^2 / 144 (sq inch / sq ft)
What that means is the walls for a 20 ft x 20 ft x 10 ft (400 sq ft) room costs under $400 USD ( ~4 yrd^3 of concrete ) to print out.
400 sq feet is the floor space for a standard 2 car garage.