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hithis is an old thread, but I think I have a pretty easy way to do it at home - it is a 2 step process and this will only work with bottles - like the water bottles that are everywhere...firstcut the bottles into string here is a possible methodhttps://www.instructables.com/id/DIY-Plastic-String...Then grind up the string with something like this- it is a filiment pellitizer.http://www.thingiverse.com/thing:288465If you want to throw a whole bottle into the grinder - it will cost lots of $$ - but if you reduce the size of the material to only a few mm wide, then it gets much easier. This should get you to a pelletized PET bottle plastic you can then use to make filiment from pretty cheaply and close the loop between plastic junk and filiment
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