Thank you for highlighting 3D printing.
I've been tracking large-scale 3D printing mostly of civil engineering types of structures and structure components. It's in it infancy and so different than traditional on-site and precast construction that it will initially be ignored, discredited, and opposed.
I understand the Henry Ford once said, if, before the automobile you asked people what transportation improvement they wanted, they would have said "faster horses." Knowing that, he gave them what they did not know they wanted -- the automobile -- and they loved it.
If we ask ourselves what on-site or precast concrete construction improvements we want, would we say better concrete, faster forming, more attractive surfaces, etc.? Or are we likely to say we want a completely different approach in which there are no forms, any shape is possible, waste is minimized, options to concrete appear, construction/fabrication time is reduced, portable construction machines abound, buildings are mass produced on site, initial cost per square foot declines, annual energy costs drop, one set of job skills becomes obsolete, a new set of job skills appear, ....?
I suspect we would tend to chose the first. However, we will, like the automobile and the electronic calculator and the smart phone, get the latter and love it.
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Stu Walesh PhD, PE
Consultant - Teacher - Author
219-242-1704
www.HelpingYouEngineerYourFuture.com------------------------------