3d house printing jigs
Make a plan and set of instructions that would allow anyone to make a simple wooden frame-work that could hold up and guide concrete pourer for 3d building printing. You know, a small scale template that would make sure the concrete is poured in the right places.
Would be handy for people in disaster areas or places where they need to make buildings in a few hours. All you need is concrete mix, the pipe and the wooden jig frame.