Hollow 2x2x2 is a 2x2x2 Rubik's Cube that has been hollowed out. The puzzle has a rails mechanism that keeps the parts together. One corner acts like a core surrounded by seven corners. There are nine hidden edge rails and three hidden centers.
Watch the YouTube video
Read at the Shapeways Forum
Read more at the 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.