About this 3D model

I am the author of this puzzle. Http://www.twistypuzzles.com/forum/viewtopic.php?f=9&t=31380 A puzzle created on the mechanism of the Rubik's cube 3х3х3. The uniqueness of this puzzle is that it is not collected in colors, as in the classic Rubik's cube, but in the shape of a cutout on the edge. Gets like a Rubik's cube 2x2x2.