Six to Three is a six-banded puzzle ring, designed by Bram Cohen
On Tue, Aug 23, 2011 at 2:39 PM, Bram wrote to Oskar:
"Hey Oskar, I came up with the attached puzzle ring design the other day. This one is also taking things in a different direction, in that it's six bands where each one is linked to the three which it isn't next to, and everything comes apart easily, sort of the opposite of the other new one I sent you where each band is connected specifically to the ones next to it and it only comes apart via a holistic move. I'm not sure how this one discombobulates, and have no idea how hard it might be."
As we learned from the prototype, the answer is "very hard".
Watch the YouTube video
Read at the Shapeways Forum
Read more at the Non-Twisty Puzzles Forum