Entering 2015, Reprapper has successfully developed a new material for FDM-based 3d printers.

If you are a 3d printing hobbyist, and you find common 3d filament (ABS, PLA, PETG, Flexible...) just cannot meet all your needs for printing, try Reprapper's Copper PLA.

This new filament actually smells and feels like copper, which people may think it's pure metal filament. In fact, it's PLA-based filament added with copper, so it prints well on common FDM-based 3d printers. Models printed with this special filament have special surface and color like copper.

If you are interested in this new copper filament, see more at http://www.reprappertech.com/blog/Copper_filament/.