I didn't see a screwless version of this cube so I decided to use emmett's screwless heart gears scad file, http://www.thingiverse.com/thing:12208, to generate one for the derived companion cube. I also slightly skewed the rotation a little so the gears wouldn't all be symetrical.Just print one of every gear (1-8), the center piece, and 4 sets of pins.I've also included a plate with the four smaller gears and another plate with the center and pins on it for convenience.