Boston Model 19 Pencil Sharpener Gear Replacement - humming sound fix

How to replace the main gear in a Boston Model 19 (or 18) Pencil Sharpener.
I 3D printed a gear from here:
www.tinkercad....
(You can find models on other 3D printable sites as well, and people sell them on Ebay in the $7-10 range.)