Chain Cube is an old Oskar design, from 7 March 1983. The puzzle is a chain made of two types of links, namely straight and twisted. The object is to fold the puzzle into a cube. The original 1983 prototype was made in wood. The modern version is 3D-printed plastic.
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.