Filament manufacturer 3Dom USA cares about the environment, and, with partner c2renew, they have developed a line of bio-based filaments. First was Wound Up, a filament made from coffee byproducts, and now they're releasing Buzzed, a filament made from the waste products generated from brewing beer. Read more at 3DPrint.com: http://3dprint.com/101856/3dom-buzzed-beer-filament/