Size 8, 18.54 mm inner diameter. This six-part puzzle ring is a design by Bram Cohen. Bram writes: "This six-banded design is a straightforward extension to the traditional four-banded design which somehow never occurred to anybody before me".

Watch the YouTube video
Read at the Shapeways Forum


IN: 1.008 w x 0.869 d x 1.008 h
CM: 2.56 w x 2.208 d x 2.56 h


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Dear Ignakano, The concept of puzzle rings is already very old. Bram's design is special because of its specific weaving pattern, which is quite different from the classic many-band weaving. Bram Cohen design is also significantly harder than the classic designs. Oskar
July 23, 2010, 12:43 pm
Not sure when Bram Cohen had the idea, but if it was after 1997, I know for a fact that the idea was not new. Back in 1997, I bought two 7-band ring from Orb Silversmiths (we use them as wedding bands), and they had rings up to 17 bands, if I recall correctly. They seem to have gone out of business, but has quite a few designs, although not the exact 7-band models we got.
February 12, 2010, 1:32 am
See YouTube clip at More info at Shapeways Forum Oskar
July 12, 2009, 6:58 pm


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