Cone Four is an exploration of an idea by Hunter Craighill. Hunter's idea was to have a puzzle ring that is in between a regular ring and a coaster, that is, a cone shape like a vulcano. This puzzle is based on the classic "Turkish" four-band puzzle-ring design, turned into a cone. The puzzle is not too hard to solve, but it is not trivial either.
Watch the YouTube video.
Please order a 3D-printed do-it-yourself puzzle kit from Shapeways at this page (check with Oskar about screws and stickers), or
contact Oskar directly if you are interested in obtaining a fully colored, stickered and assembled sample of this puzzle.