by ColinBB, published
I've taken ferret7's http://www.thingiverse.com/thing:1340 and optimized for a necklace and/or keychain. Rather than drilling a hole after printing, I put the hole in the design.
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I print with 0 extra shells and 10-20% infill. Bend your own wire for a keychain or necklace. Or just buy a key ring.