In relation with this post about PLA.
I STRONGLY RECOMMAND TO STOP 3D-PRINTING OTHER MATERIALS THAN PLA.
Ok to summerize : PLA has to be recycled with other plastics because, for the moment, it's not easy or *is* expensive to separate from current other plastics like ABS and PETG.
But it's not made from fossil petrol. And this is a good start.
--Luis-David Venãncio / 3DLibre.com owner.