3-D house in 1974

This blog post is another of those for which my blog is not widely seen. Tells about plans for making a house by a 3-D printer in the near future. It will involve printing interlocking sections out of plastic then putting them together.

I have mixed feelings about this. First one was to mentally say, wow, another of my ideas is coming into reality, vindicating me.

The next thoughts were a jumble of things like I described how to do that back -- about 1974, and have included another version of it in my sci fi novel "Going Past The Town Prison ( IS N 978-1450568470 ) written in 2009, copyrighted the paperback book in 2010.

Am not sure when I first thought of the idea, was early 1970's as I was being a weekend-daddy after divorce, and one of the entertainments I created for them was to make such an object, more of a 3-D art form of their own choosing. They built them in buckets, and I made one too at same time, and somehow that object has survived and sits on a shelf behind me as I type this.

But the house version was the seed idea, original intent. It would start with the erection of a large open-top cylinder of steel, surrounding the construction site. Then within that strong steel large cylinder - bigger than the building that would ultimately stand there - a computer program would simply shift the nozzle flow from two sources, one was a sand-cement mixture like concrete topping; and the other was just wet sand. The nozzle would scan back and forth across the area of the inside of the cylinder, depositing either the concrete mixture or the wet sand, according to the computer's program, each layer being built on top of the next one. Each layer would be like a horizontal slice section of the building.

When the concrete hardened, the steel cylinder sections would be unbolted, the sand flushed out by a hose, and the hardened concrete building would remain.

That was the concept in simple form, but in practice there would first need to be the placement of the tied-together steel reinforcing rods, and the placement of tubing for plumbing and electrical conduits put in place first; and the computer's program would have to arrange for the sand-cement nozzle to dodge this reinforcing and tubing, as it scans back and forth across the horizontal slice layers of the building to be.

The essence is that the wet sand couples the lateral pressure of the cement over to the surface of the surrounding steel cylinder, keeping the cement in position while it cures to a hard material, while the wet sand does not harden. Thus after hardening of the structure within the cylinder, the sand will wash out but the cement will remain in place.

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