Poly6 recently developed a new biomaterial called Citrene, made from citrus rinds. Citrene resins are strong , flexible and biodegradable materials and outform other materials, offering not only safety and environmental friendliness but are also cost efficient to manufacturers. The main ingredient constitutes a natural oil making it fit for human consumption. The company is also looking to use bioprinter from Aether to explore the uses of Citrene.
Source: http://www.poly6.com/citrene/