We didn’t notice [Nikita]’s post about building a concrete 3D printer, a few months ago, but the idea seems sound: build a basic CNC XY axis and then add a mortar pump and hose to deposit concrete.

If this machine had hit the shelves just a few months ago, it would have gone straight to the top of our best 3D printers list. It's absolutely superb. However, in the wings are the new multitool ...