Students at Victoria University of Wellington have been assigned the task of designing a functioning 3D printer with a “green” solution within a four week timeframe. Ouch….

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One of the solutions is RecycleBot,
which chews up plastic milk bottles (probably High-density polyethylene
(HDPE)) then extrudes it as a cable suitable for feeding into a
standard MakerBot.

Sure the hardware is a little on the brutal side but this is a great idea to get more sustainable materials into DIY 3D printing. Also I am not sure how this affects the extruder head temperature and we do not yet see any products coming out of this experiment but four weeks work.. well done team.

Found via Ponoko