http://www.sciencealert.com/this-new-device-recycles-plastic-bottles-into-3d-printing-material Three engineering physics students at the University of British Columbia in Canada have invented the ProtoCycler, a device that can grind up all kinds of waste plastic into a beautiful clean spool of plastic filament that can be used in a 3D printer via This new device recycles plastic bottles into 3D-printing material - ScienceAlert.