Think of
polyjet printing as a magnificent hybrid between FDM, SLA printing, and normal
2D-inkjet printers. These machines squirt out tiny droplets of photo-reactive resin onto a build surface, and then immediately cure (harden) it with ultraviolet light. This process is then repeated hundreds (if not thousands) of times to create objects layer by layer. The big difference is that unlike FDM printers, polyjet machines can deposit material from multiple nozzles (hence the name) at once — which gives them a variety of advantages.