[mindcrime]

There's a sort of "faux wood" material you can print with as well.[1] And there is such a thing as 3D printing with metal also[2], although that can be much more expensive and probably isn't down into the reach of DIY'ers yet.

[1]: http://www.wired.com/design/2012/11/3d-printer-wood-filament...

[2]: http://www.extremetech.com/extreme/143552-3d-printing-with-m...