13.1mm
thingiverse
A personalized adaptation of http://www.thingiverse.com/thing:44815 was created using the Customizer at http://www.thingiverse.com/apps/customizer/run?thing_id=44815. To print, set type to 1, margin at 0.1, enable edges and cursor at 100, choose a diameter of 13.1mm, use $fn value of 50, add a groove with depth of 1, and set weight as 11.
Download Model from thingiverse
With this file you will be able to print 13.1mm 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 13.1mm.