13 mm
thingiverse
This is a personalized version of the Thing found at http://www.thingiverse.com/thing:69655, designed using Customizer (http://www.thingiverse.com/apps/customizer/run?thing_id=69655). For fabrication, set Tool Length to 10 and Nut Size to 13. Use the 'write/Letters.dxf' font and select Extruder 1 for Dual Extrusion. The kerf is set at 0.3 and the message engraved will be "13 mm".
Download Model from thingiverse
With this file you will be able to print 13 mm 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 mm.