Nut Stack

Nut Stack is a packing problem. The object is to fit the screw and the four nuts into the pentagonal box. The way to do this is to fit the nuts around the screw and put these together into the box. Each of the nuts is pentagonal with an elongated side. When one turns the nuts around the screw, all nuts stacked together form a pattern. Only one of all 12x16=192 possible permutations and combinations matches the pattern of the box. In order to make the puzzle more accessible, each of the nuts has two little black markers. When any two nuts are bolted together, their markers line up. This makes it easier to try and analyse the puzzle.

Watch the YouTube video.
Read at the Shapeways Forum.
Read more at the Non-Twisty Puzzles Forum.

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.