The Yoshimoto Double Cube

The Yoshimoto Cube](http://www1.ttcn.ne.jp/a-nishi/y_cube/z_y_cube.html) is a polyhedral mechanical puzzle invented in 1971 by Naoki Yoshimoto, who discovered that two star-shaped rhombic dodecahedrons could be assembled into a cube. These two dodecahedrons make it possible to split the cube equally in half.

Yoshimoto Cube Animation

The two polyhedra are articulated with hinges.

The attached stl files contain 2 elements and 2 axes of hinges. Four impressions are necessary to assemble the 8 elements of each dodecahedron, 8 impressions are necessary in all for the whole cube.

The assembly is done by inserting the narrow part of the hinge axis from the center of the edge to the end of the edge. A pair of pliers can be used to lock the hinge pin in its correct position.

Assembly

Printing does not require a raft or support. The stl files are designed for a layer thickness of 0.12 mm.

To print with another value, change the parameter "epi" in the scad file and adjust the values of the edges and hinges.

The size of the edge of one piece is calculated from the sizes of the hinge elements and clearances (must be multiple of the print layer thickness (epi): Edge = 6 hinge elements + 5 clearances).

Yoshimoto's double cube

The Yoshimoto Cube](http://www1.ttcn.ne.jp/a-nishi/y_cube/z_y_cube.html) is a polyhedral mechanical puzzle invented in 1971 by Naoki Yoshimoto, who discovered that two star-shaped rhombic dodecahedrons could be assembled into a cube. These two dodecahedrons make it possible to divide the cube into two equal parts.

Yoshimoto Cube Animation

Both polyhedrons are hinged.

The attached stl files contain 2 elements and 2 hinge pins.

Four impressions are needed to assemble the 8 elements of each dodecahedron, 8 impressions are needed in total for the whole cube.

Assembly is done by inserting the narrow part of the hinge pin from the centre of the edge to the end of the edge. Pliers can be used to lock the hinge pin in its correct position.

assembly

Printing does not require a raft or stand. The stl files are designed for a layer thickness of 0.12 mm.

To print with a different value, change the parameter "epi" in the scad file and adjust the values of the edge and hinge lengths.

The size of the side of a part is calculated from the sizes of the hinge parts and the sizes of the sets (must be a multiple of the print layer thickness (epi): Side = 6 hinge parts + 5 sets).

-