Of course they are crude today, but 3D printers are going to shake things up beyond a doubt.  MakerBot and similar companies are working on cheap, commercial versions that everyone can use.  The guys below at EADS are using much more sophisticated design tools and printers, but they were able to create an ENTIRE BICYCLE with the technology.  This is just remarkable and is a good indication of what you’ll be able to do within a decade with $5 worth of plastic powder. 

Couple things to note.  First. there are some metal parts in the clip that I’m sure they also ‘printed’ from metal powder.  Second, you won’t believe how they come up with the bearings!

Might be time to short unsophisticated Chinese factories…