Combination of a 2x2x2 cube with a screw mechanism. The cubic corners can be turned by max 270 degrees away from the center on each of the two screw sides. Because flips of the screw bottom/top are only possible in aligned 90 degree positions, there are three functional positions for the cubies from the start.
Cubies cannot be moved deeper than the initial position on the screw, but only to the outside.
Size: edge length: 4.8cm, height when fully extended 7.1cm
External LinksTwisty Puzzles: Screw 2x2x2 by OSKARhttp://twistypuzzles.com/forum/viewtopic.php?t=29391Shapeways: Screw 2x2x2http://www.shapeways.com/product/XUFYEA9HP/screw-2x2x2?optionId=57400813