3D printed gear from PA12 nylon for paper shredder 
Fellowes P70CM
Material: Nylon  with carbon fiber 

Number of teeth on big side: 50 Diameter: 37,8 mm
Number of teeth on small side: 12 Diameter: 13,1 mm: 

Total height: 21 mm
We can also make any gear for paper shreadder

 All gears was tested.