Looks like yet another bio-degradable 3D printer filament has made it to market. Twobears has announce 2 new filaments, which are completely bio-degradable. They are Biofila Silk, and Biofila Linen

http://3dprint.com/1873/twobears-ren...ament-biofila/

Both new filaments will go on sale starting next month, and have an added hardness, above and beyond what most PLA filaments offer. here is a picture of a 3D printed Butterfly using the Biofila Silk filament: