Copyright James A. Storer 2009; U.S. patent 8,393,623 March 2013.
(Kingwood with brass hinges, 2.25 inches square assembled)

Fold the eight cubes into a larger 2x2x2 cube; there are seven hinges:



Hinge 1 joins cube 2 to cube 1, on the front faces.
Hinge 2 joins cube 3 to cube 2, on the back face of 3 and the right face of 2.
Hinge 3 joins cube 4 to cube 3, on the top faces.
Hinge 4 joins cube 5 to cube 4, on the front faces.
Hinge 5 joins cube 6 to cube 5, on the left face of 6 and the right face of 5.
Hinge 6 joins cube 7 to cube 6, on the back face of 7 and the front face of 6.
Hinge 7 joins cube 8 to cube 6, on the top faces.

Fun but not too hard; people often spend 30 minutes or so to solve. Solid hinges suggest folding one cube at a time, which can lead to a position like the one shown on the right above.

Construction has four types of hinge cutouts:

Type A: Cube 1,7,8: Top-Right
Type B: Cube 2,5: Top-Right, Left-Up
Type C: Cube 3,4: Top-Right, Back-Up
Type D: Cube 6: Top-Right, Front-Up, Left-Right

The types can be arranged in this order and then rotated appropriately to attach hinges:

1 2 3 4 5 6 7 8
A B C C B D A A

Made by J. A. Storer, 2022 (2.25" square assembled; a 2" version was also made).
Prints the 8 cubes and then attaches the same brass hinges used for the original wood version, where precise cutouts and screw holes are made for the hinges.

Made by Andrew Soshea, 2022 (2.25" square assembled).
This clever design prints a fully working puzzle. The hinge pins have a tolerance around then so that no cracking of joints is needed after printing. The box is a separate fully working 3D print; writing on the box top and bottom is via a thin initial layer before changing colors.