 There is some evidence that using this approach of distributed recycling is better for the environment  and can be useful for creating "fair trade filament".In addition, 3D printing products themselves at the point of consumption by the consumer has also been shown to be better for the environment.The RepRap project has identified polyvinyl alcohol (PVA) as a potentially suitable support material to complement its printing process, although massive overhangs can be made by extruding thin layers of the primary printing media as support (these are mechanically removed afterwards).