this post was submitted on 04 Sep 2024
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Futurology
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From what I've ready, the concrete recipe is the hard part.
Yup, it needs to dry fast enough for the next layer, but not so fast it makes a clog, and it needs to flow in just the right way you can predictably extrude a layer on. And be cheap-ish.
Of course, you still have to add a lot of non-structural components, like the other user said, and if it needs to take significant loads you also need to add reinforcement somehow, since concrete is weak under tension.
You also need to add insulation and then do something to hide the ugly layer lines.