This technology single handedly has to power to disrupt the whole manufacturing and mechanical product development industry to a huge extent .
Consider the fact that you can make each and every part of a machine lighter stronger.
Consider the fact that you can design things which were not possible by traditional methods of manufacture
Consider the fact that you can customize functional designs on the go depending on various usage.
May be in the next 10 years we might see some major disruption in this field when 3D printers which come closer to compete traditional mass manufacturing processes.
As an example of what 3D printing can do consider the project of GE - 3D printing challenge in which a Jet engine bracket was redesigned by an Indonesian engineer with no connection to GE and it gave weight saving of 84 % !.