There is a new 3D printing filament about to his the market this summer, from taulman 3D, Eastman Chemical Company and Aleph Objects (LulzBot). It is called n-vent and it will have some superior properties such as lack of shrinkage and warping, as well as low odor emissions and high strength. It will be available in multiple colors sometime this summer. Read and see more on this stuff at http://3dprint.com/66670/n-vent-filament/