We hade one at work had enough going on that we needed to order a second one. They ended up shipping two, and we decided to keep both because it was easier than shipping it back. I was skeptical that we could put 3 to good use. Well, all 3 of them run pretty much all day. Mostly printing small parts for experimental apparatus or test prototypes.
We've been doing 3-d printed concrete for a few years at bench scale. We have a proposal in that would allow us to go to demonstration scale (size of a large living room with a high ceiling) 3-d printing for construction with two robotic arms coordinating with one another.
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