Tony Fisher used an Eastsheen 4x4x4 cube to make this fully functional cuboid.
Tanner Frisby also build this puzzle in 2008. It is not as exact as Tony's original, but also fully functional. Tanner's cuboid weights 169g. Size: 12.2 x 6 x 6.2 cm. The center pieces are a little bit thicker and the stickers not 100% exact. Nevertheless the puzzle turns very well.
The cubies of Tony's puzzle are closed also on all internal sides. This is not the case on all sides with Tanner's puzzle. The pictures show the differences.
Frank's 2x2x4 Cuboid:
3D printed puzzle with a design provided by Thomas Lohe. These are extensions glued onto a 2x2x2 Mini Eastsheen.