Jens Dyvik and Jon Nordby did some research and experimenting on recycling 3D print waste, aswell as combining plastic and wood waste.
Upper plate: Grinded PLA.
Left plate: PLA and valchromat combined.
Rigth box: the burnt and failed results of valchromat combined with PLA.
The plastic was grinded using a household mixmaster.
This block is pure PLA casted in a box, then put under pressure by the means of vices.
This however, is the result of a failed batch of PLA and valchromat: