That looks a lot like the guts of the Hippo mill I’ve got collecting dust in the corner of my warehouse, only the edges are beveled.
We do have two of the open source plastics shredders. Works reasonably well. Requires some modifications if you want it to happily handle sticky material and not heat up/gunk up.
They’re a bit of a pain in the ass to clean.
We’ve got “release an open source shredder design” on our to-do list but it’s a very long list and I’m afraid that’s not very near the top.