custom gear
thingiverse
A personalized adaptation of http://www.thingiverse.com/thing:50908 has been crafted using the Customizer at http://www.thingiverse.com/apps/customizer/run?thing_id=50908. Key adjustments include a 100% scale, 12 teeth, a hole size of 2.55, and a height of 5, with a spur gear type and a hole feature enabled.
Download Model from thingiverse
With this file you will be able to print custom gear with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on custom gear.