3-D printing 1 3D printers 1 3D printing 1 3D-printing 1 Additive manufacturing 1 Additives 1 Blend ratios 1 Degradation effect 1 Feasibility studies 1 Glycols 1 Mechanical testing 1 PETG 1 Pelletizing 1 Planning 1 Plastic bottles 1 Plastic pellets 1 Plastic recycling 1 Plastics recycling 1 Polyethylene terephthalates 1 Printing materials Recycling cycle 1 Tensile strength 1