Producing items additively by combining small pieces instead of starting with unshaped materials and cutting into them offers many intriguing possibilities, most notably the ability to make structures which would be implausible or impossible to make via conventional techniques and the option to customize every item produced to the dimensions and other specifications chosen.
This video from the architecture and furniture design group MX3D gives a sense of what is becoming possible:
See also: Feast Your Eyes Upon the World’s First 3D-Printed Steel Bridge