Research 3d metal printing powder. Also research microwave assisted sintering.
https://www.youtube.com/watch?v=N-ztpnVgO9o
Very neat video...
Hopefully one of my projects in the near future will be to build a MPCNC machine (Mostly Printed CNC). I torn between doing that or purchasing one of the inexpensive Chinese desktop CNC machines that are capable of machining aluminum. A lot of people purchase the Chinese machines and then customize them with better parts. That is one of the advantages of the Chinese 3D printer that we own... it is based on the RepRap Prusa I3 open source printer, so it can be easily customized with better parts. It came with a broken limit switch, but I was able to go to my neighborhood Radio Shack to get it up and running an hour later.
https://www.youtube.com/watch?v=l7OXGwx-O-s