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[Nobahamas]

RE: Flying trader, contamination

Who are we to think processes cannot be changed?
For example: A team of Northwestern University engineers has created a new way to print three-dimensional metallic objects

The process takes a very intense energy source, such as a focused laser or electron beam, that moves across a bed of metal powder, defining an object's architecture in a single layer by fusing powder particles together. New powder is placed on top on the previous layer, and these steps are repeated to create a 3-D object. Any unfused powder is subsequently removed, which prevents certain architectures, such as those that are hollow and enclosed, from being created. This method is also significantly limited by the types of compatible metals and alloys that can be used.

See:
http://phys.org/news/2016-01-d-metals-alloys.html