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MIT's system,
. . . is freed of the special constraints of a more traditional 3D printer,
. . . by the long industrial robotic arm out front.
Another, more precise arm is attached to the end of that one,
. . . allowing it to be controlled with much more precision.
. . . This gives the system much a larger build space than a traditional 3D printer,
. . . which is constrained by the limited volume of its print bed.

This platform can construct in 14 hours,
. . . a 12-foot-high dome, made out of a combination of,  
. . . foam, and concrete, creating a structure that is solid,
. . . while still sporting space for things like  
. . . wires, and pipes, to be inserted in its side.

3-1-2019 Source: #MIT’s giant mobile #3D printer  Video