Which AM method uses one or more print heads to successively layer droplets of build material onto a build platform?

The method that uses one or more print heads to successively layer droplets of build material onto a build platform is material jetting. This additive manufacturing process involves ejecting material in the form of droplets from the print heads, which then solidify to form layers of the final object.

In material jetting, the print heads move over the build platform and deposit tiny droplets of photopolymer or other materials layer by layer. This technique allows for high-resolution details and the potential for multi-material printing, enabling the creation of complex geometries and varied material properties within a single build.

The other methods listed operate differently. Material extrusion involves pushing a thermoplastic filament through a heated nozzle to create layers, rather than layering droplets. Binder jetting uses a binding agent to join powder particles, while selective laser sintering employs a laser to fuse powdered material together. Each of these methods has distinct processes and applications that differentiate them from material jetting.