Help alternative machine for shredder

hey there first of all im german living in argentina and i love the idea of this. now since it seems its quite expensive to build the laser parts in here, theres no alternative for shredder the plastik down ? with easyer maschines ? thanks

I saw this video last week:
i have no clue if it works for plastics, but it might.

you can try with a blender or a meat mincer for starting! buy a second hand one for a fraction of the cost, and then if you need move into the Precious Shredder which is a bit more industrial grade