At first glance, the Non-Void Cube, with its plastic appearance, looks very much like an ordinary Rubiks Cube without any of the coloured stickers. In fact its a 3D printed interlocking burr designed and created by Andreas. The Cube is very nicely printed and the tolerances between the pieces sufficiently tight. Notwithstanding, the pieces move and slide smoothly and I experienced no jamming whatsoever. Size-wise, the Cube is 6cm all round, the size of a normal Rubiks Cube.
And what is unique about the Non-Void Cube is that it has got no voids (holes) within the cube, yet it has a Level 4.3.3 solution, something that is impossible to achieve with a typical burr design. Andreas managed to create this puzzle by attaching the cubes of the 4 pieces not by joining the faces of the cubes, but via their corners (see photo above). In this manner the pieces can slide in the various directions even without the voids or voxels necessary.
While it takes only 4 moves to remove the first piece (and with some effort not too difficult to figure out) and 3 moves each to remove the next two, the design is not without some trickiness. If you scramble all the pieces after disassembly, and unless you have a very good memory, you may just forget the orientation of the pieces (like I did) and find yourself in a bit of a bind trying to reassemble the thing. Again with some persistence and time, it is do-able. And Burr Tools would not help you here if you can't solve it, Haha!. Is Andreas hiding some features of the software which he is only keeping to himself?