11 mm tunnels
thingiverse
A personalized version of the model found at http://www.thingiverse.com/thing:44815 was created using the Customizer app (http://www.thingiverse.com/apps/customizer/run?thing_id=44815). Here's a guide on how to use specific parameters: cursor at 100, groove of 1, edges set to 1, margin with a value of 0.1, weight of 11, type as 1, diameter equal to 11, and $fn set to 50.
Download Model from thingiverse
With this file you will be able to print 11 mm tunnels 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 11 mm tunnels.