Topic: Volume-Independant 3D Printing Robots for Architecture
http://www.instructables.com/id/Minibui … es-with-s/
One robot drives around and prints a foundation 150cm high. The next robot continues by gripping the wall from both sides below the current layer and spirals up as it extrudes. When the wall is done, a third robot uses a vacuum to stick to the wall while it drives up and down, extruding additional threads across the layers for strength. The material is a 2-part polymer mixed with marble dust.