Welcome to the SeeMeCNC Community

First read this thread.
http://www.bladeforums.com/forums/showt ... ife-Blades
So if someone made a filament out of those pellets we could print in metal......after it was fired at 2500 degrees F.
Good thing it's easy to oversize something by 20% in my slicer.

Just make sure to remove the supports before you sinter it.

Looking at the two steps (ignoring the tempering) after the injection or printing, it looks like a lot of big equipment to cover your "just"

But a pretty cool technique, nonetheless!

At the hobbyist level, making plastic patterns for sand or investment casting is probably a more practical route to metal parts.

At a commercial level, 3D printing of metal end product exists, aka Additive Manufacturing. Both Nasa and SpaceX have been printing operational rocket engine parts.

Here are some specialty filaments made of metal powder: http://www.proto-pasta.com/collections/retail