Minimal Hepta is a deep-cut twisty puzzle, similar to its siblings Minimal Hex and Minimal Octa. However, whereas the siblings are so-called "simple" deep-cut puzzles, Minimal Hepta is of the complex type, that is deep-cut-that-cannot-be-implemented-with-male/female-dovetails-without-introducing-some-additional-bandaging. In order to make the mechanism work, it has some hidden rails inside.
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.