The 4x5x6 Cuboid is the next step up from my 3x4x5. This puzzle was made at the request of Sigurd Wedel. Just like the 3x4x5 this one shapeshifts as 90 degree turns are possible on the 4x6 faces.
In the design I've used a mechanism slightly different from that of my 3x4x5 and slightly more like a V-Cube. The result is a puzzle that rotates very smoothly, even better than the 3x4x5. This puzzle is truly very complex, having more than 40 different mechanical parts.
Read more about this puzzle on twistypuzzles.com
If you order this model, you will get a DIY kit of the plastic parts needed to make this puzzle. You will need to supply your own screws (M3), stickers and springs for assembly.