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Smoking Ring Large
thingiverse
I stumbled upon a prototype of a smoking ring on Thingiverse (http://www.thingiverse.com/thing:1936607) and I chose to scale it up significantly so that individuals with larger hands can comfortably use it as part of their class project.
Download Model from thingiverse
With this file you will be able to print Smoking Ring Large 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 Smoking Ring Large.