We’re Going to Need a Bigger Printer

There are times when I worry about some of the crazy ideas people get about technology. Of course, I worry about people in general, and given some of the things I have seen in my travels – people who actually believe that you could use a fax machine to send someone three-dimensional objects, for example – I’m not sure you can blame me. Technically, I suppose, it might be possible to fax 3-D objects, if you had a sufficiently powerful scanner on one end and a 3-D printer capable of working in some medium that could duplicate the original object on the other. However you still couldn’t transport an actual object, and you certainly couldn’t send someone a hot meal or a cold drink using such a method using the current printer technology. Moreover, given how expensive most of the 3-D printers are to use, there’s very little point in trying to make larger constructs using such a method. After all, as one of the designers behind the Star Trek franchise put it, if you can create starships at the push of a button, you probably don’t need to…

The same may not be true of buildings, however, if an article that turned up on the Wall Street Journal site last week is correct. According to the article, a Chinese firm called Winsun had developed what appears to be a very large version of a 3-D printer; one with nozzles that spray concrete instead of ink or sugars (or whatever), and which uses glass fibers for reinforcement. Using this giant printer, the company was able to pre-assemble enough parts to build 10 houses of 200 square meters each (about 1,460 square feet, if I’ve done my math correctly) in only 24 hours. The company is working on other applications for the system, including commercial properties, office buildings and so on. So far there is no word on how long it will take them to generate larger prefab elements, or how large a structure can get before this method will lack the structural strength to stand on its own…

Now, we should probably note that Winsun isn’t exactly putting a template for a house into a three-D printer and just pressing the “go” button. What they are assembling are effectively prefabricated sections for a building made entirely out of reinforced concrete, and there are definite limitations to how useful an all-concrete structure is going to be for residential/non-industrial applications. It’s also worth noting that anything you could actually call a “house” will also require glass for the windows, wiring for the outlets, doors that you could actually open (as opposed to ones made exclusively out of reinforced concrete), plumbing and fixtures made out of porcelain (or the equivalent), lighting, kitchen appliances, and a host of furnishings. Having the structure spring up in matter of hours – or however long it takes the concrete in the prefab sections to cure, anyway – would speed up the process, but it is debatable how much it would lower the cost. Despite what the article would have us believe, this is more “advanced prefab building technique” than it is “super high-technology magic…”

On the other hand, it is hard to deny that there are lots of useful things you can build out of reinforced concrete – and that if Winsun is actually successful in adapting the printer to use whatever salvaged materials come to hand in building its prefab sections, they might be able to overcome the cost issue. You’d still need the rest of a construction company to finish off the buildings, but there is some real potential here. And if someone applies the same technology to other building materials (there are already smaller printers that work with composite laminates, for example) there doesn’t appear to be any reason why you couldn’t fabricate all of your building components this way. Maybe we should keep an eye on this story going forward…