This is a 3D printed version of my Ghost Cube, a 3x3x3 mod that solves by shape instead of color, and is meant to be as confusing as possible.
This version has a newly designed core that allows the puzzle to be easily assembled from just the printed parts, without needing to use any screws or springs. The puzzle turns very well, even with nothing but printed parts. The puzzle is a bit tight to assemble, and may "squeak" a bit (due to the print lines) when turned until the parts are broken in, but very quickly turns great!
Read more about this puzzle on the Twisty Puzzles forum.