This is a gear that's next to the motor drive in the shredder. My unit is the Bonsaii C156-D Dec 20 2018 made in China but will fit many China models that are home use with a 12 sheet max.
Print Settings
Creality
Ender 3 Pro
No
No
.16
15
Creality
PLA
I put 4 walls the help make the teeth strong so they don't shear off and 7 top layers and 5 bottom layers so where the little gear attaches to the larger has some strength.
The author marked this model as their own original creation.