by Paul G Di Filippo
Here's what a Mortenson Domotica house printer looks like.
Maybe you've seen a hydraulic gantry crane at a shipyard? A quartet of enormous vertical wheeled legs forms the corner posts of an open rectangular framework. The legs are connected at their tops by four beams at right angles to those they touch. The crane can position itself over an object, send down its grapple from its cross beams, lift any cargo that fits within its footprint, and wheel it into a new location.
Well, there's no hook for lifting in the house printer; the four horizontal cross beams--actually there are sometimes six or more girders--contain the myriad printheads, and the beams themselves move vertically up and down the leg framework, from ground level to two or three stories high, depositing the hotmelt plastic according to the instructions in the house printer's brain. Add in a giant hopper holding the raw materials, and you've got the whole mechanism. Oh, yes, the beams and printheads can also adjust their relations to each other along many axes, assuming many different configurations, coming closer together or moving further apart.
A single Mortenson Domotica Model 2040-X can build a one-thousand-square foot multi-story residence with all wiring, plumbing and HVAC installed in roughly twenty-four hours. They're like house-laying hens, dropping a building and moving on.