Please note that the content of this book primarily consists of articles
available from Wikipedia or other free sources online. Direct digital
manufacturing is a manufacturing process which creates physical parts
directly from 3D CAD files or data using additive fabrication
techniques, also called 3D printing or Rapid Prototyping. The primary
distinction between the use of other terms to describe 3D printing is
that Additive Freeform Fabrication is solely intended to describe a 3D
printed part that is to be used as the final product with minimal
post-processing. Whereas other terms used to describe Rapid Prototpying,
Additive Freeform Fabrication and the like are simply alternative ways
of describing the 3D printing process itself.
