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Or, in a different sourcing method, if you could somehow get 500 2 liter soda bottles, you could get approximately 21Kg of PET plastic for a very low cost, and save the environment at the same time. I don't know where I would get this many bottles, but if you could buy them at the current return rate in the US, (5 cents per bottle), it would only be 25 dollars for the 20kg. These prices never cease to amaze me, because I am spending that much for only 1kg of PLA filament.