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Some guys in our city are doing this on a larger scale, schools in the area collect all plastic bottles and in return they get 3d filament: https://www.greenbatch.com/

Wow that's great, I wonder how they modify the PET polymer, as I've been researching it's not an easy polymer to print with atleast not without the glycol modification which is usually sold as PETG.

Any idea how they are doing it?

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