12mm tunnels
thingiverse
Here's an interesting 3D printed model: this 12mm stretcher prints out neatly without the need for supports when made of pla. Just give me a shout if you want a different size. Enjoy printing!
Download Model from thingiverse
With this file you will be able to print 12mm 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 12mm tunnels.