The term "rapid" arouse because — unlike conventional manufacturing, in which, say, an injection molding machine makes plastic parts, or a lathe cuts parts from metal bar stock — rapid machines "build" parts directly (i.e., rapidly) from 3D CAD data. Different technologies fall under this moniker, but their underlying principle is similar.
Slicing CAD models
First, special software "slices" a 3D CAD model of a product into thin layers. A build machine imports this data and fabricates the part from proprietary plastics, resins, or metals, layer-by-layer, as dictated by the corresponding CAD slice.
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