The natural material (in the video it’s sand) is placed into the printer, which has a liquid spray system. This liquid acts as the binder in a regular 3D printer (such as a ZPrinter), and it consists of an environmentally sustainable liquid, a compound called Polypavement.
The 3D printer is hooked up to a computer to tell it what to create via software files. The printer then proceeds to create the design as would any other 3D printer would -- in layers. The Stone Spray works by having an extrusion nozzle spray the sand in the appropriate pattern and a separate extrusion nozzle spray the liquid binder to ‘harden’ the sand.