I'm not a mechanical engineer but I attempted to build a shredder.

Links to papers:

https://iptek.its.ac.id/index.php/jps...
https://thesai.org/Downloads/Volume12...
https://www.instructables.com/Circula...
https://content.instructables.com/F5A...
https://content.instructables.com/FXF...
https://www.polytechindustrial.com/pr...

Precious Plastic Shredder:

Old:
https://www.printables.com/model/2810...

New:
https://community.preciousplastic.com...

Brands that sell gearboxes:

Boston Gear: (https://www.bostongear.com/products/e...)

Dodge Tigear: (https://p1.aprimocdn.net/dodgeindustr...)

SEW-eurodrive

Falk omnibox worm reducer: (https://www.rexnord.com/contentitems/...)

If you want to contact me:

Business Inquiries: [email protected]
Instagram:   / matttheengineerguy  
Twitter:   / sirspunk  

If you wish to support me:

Patreon:   / scicynical  
Buymeacoffee: https://www.buymeacoffee.com/scicynical