In the case of b), the hose whip doesn’t happen; concrete just stops emerging from the delivery system. The operator can reverse the pump to remove pressure, then find and dislodge the plug ...

"So we built a coupler form under the window where we could attach the pump hose. The concrete fills the form under the window and pushes from the bottom up into the columns." The rest of the ...

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 ...