have you ever seen a building construction? it's pretty much 'manual 3d printing' they form some crude walls with cheap wood, and pour lots and lots of concret

have you ever seen a building construction? it's pretty much 'manual 3d printing' they form some crude walls with cheap wood, and pour lots and lots of concrete, and the bigger challenge for bigger building is that you have to pour one level at a time in one shot. and if you pour too much it gets too hot while it dries and the concrete gets flaky.