High-density polyethylene

Joshua Pearce holds a DremelFuge chuck made from shredded plastic milk jugs.
Save Money and the Planet: Turn Your Old Milk Jugs into 3D Printer Filament
Collapsible solar pavilion charges Volvo V60, fits in its trunk
Turning Trash into Cash . . . and Saving Energy
How Method Turns Plastic Pollution in the Ocean Into Bottles