Involute gears
thingiverse
gears generator from http://www.thingiverse.com/thing:1427458 , just touch to make hexagonal head.
Download Model from thingiverse
With this file you will be able to print Involute gears 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 Involute gears.