Self Defence Ring
thingiverse
I bought a metal version of this ring on ebay. This is made to fit a finger with a diameter of 21.5 mm, I recomend to only print the first layer to see if the size is right. Link to original product: https://preview.tinyurl.com/y86h6wzk If there are any issues with this let me know, be it for the design or for copyright isues.
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