19 mm tunnel
thingiverse
This is a customized version of the design found at http://www.thingiverse.com/thing:44815, created using the Customizer app (http://www.thingiverse.com/apps/customizer/run?thing_id=44815). To create your own unique spin on this model, follow these instructions: set groove to 1, increase $fn to 50 for smoother details, enable edge effects with a weight of 11, maintain a margin of 0.1, adjust cursor size to 100, and select type 1. Lastly, alter the diameter to 19 as desired.
Download Model from thingiverse
With this file you will be able to print 19 mm tunnel 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 19 mm tunnel.