Hollow Cube is a Rubik's Cube that has been made as hollow as possible. The pieces are held together by dovetail connections. Because the puzzle consists mainly of air, it is very affordable.
Watch the YouTube video
Read on the Shapeways Forum
Read more at the Twisty Puzzle Forum
Photos of pink version
and a video
Please contact Oskar directly if you are interested in obtaining a fully colored, stickered and assembled sample of this puzzle.