Additive manufacturing may sound complicated, but the theory isn't. Instead of building
a sandcastle by subtracting sand away from a pile until the structure appears, imagine
adding sand beginning at the bottom and moving up layer by layer until a castle is
built. In the actual application of additive manufacturing, the grains of sand would
be placed one at a time in a specific order pre-determined by enhanced computer design.
Fusion-based AM (melting)
Mixed-phase AM
Solid-state AM
AM via Surface Engineering