Minimal Mixup was suggested by Jared McComb. It is a skeletal (a.k.a. minimal or void) version of Mixup Cube. People sometimes wonder hoe centers and edges of the Mixup Cube can be interchangable. The skeletal version shows the geometry of the puzzle, as well as the normally hidden pieces that keep the puzzle together.
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.