Everyone in the DIY community and especially those who work with 3D printers, have one issue - plastic junk. It can be failed prints, project scrap leftovers, or maybe you are just looking for a way to shred and recycle your plastic at home.
There are a few projects on here:
https://www.instructables.com/id/Low-Cost-Plastic-S...
https://www.instructables.com/id/Plastic-shredder-f...
Most commercial grinders and their DIY derivates work on a simple mechanism of counter rotating wheels with grooved teeth to grab and tear. Check out some of the videos below
There are many more links on youtube if you want to build a beast. Most of my plastic waste comes from failed prints and leftover strands of filament which I want to recycle into fresh filament using Filabot.
Also, with 3D printers in the <$500 zone and filament spools in <$30 zone, the logic of spending $1000< for essentially recycling <$1 waste and all the time and labor didn't particularly entice me.
It turns out that paper shredders also use the same mechanism. Check out some of these videos:
Time to hack a paper shredder to grind up my waste plastic. From the time the shredder arrived in the mail to putting together this instructable, the entire project has taken me 48 hours. If you follow all the instructions to the T, this is what you should be capable of grinding in about 24 hours-
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