Cog
grabcad
Just a Cog i made for the challenge: http://grabcad.com/challenges/grabcad-3d-printing-challenge
Download Model from grabcad
With this file you will be able to print Cog 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 Cog.