Double Yoshimoto Star-Cube

cults3d

Yoshimoto's double star-cube Yoshimoto's Cube comes in the form of a cube that contains a star that can turn into a cube while the cube turns into a star. This polyhedral mechanical puzzle was invented in 1971 by Naoki Yoshimoto, who discovered that two rhombic star dodecahedra could be assembled into a cube. These two dodecahedra allow the cube to be divided into two equal parts. The two cubes are hinged with hinges. The attached stl files contain the elements and pins for the hinges to make 4 cm square cubes. Each star cube contains 8 elements of 2 cm side and 8 hinge pins. For best effect, it is recommended to print the two star-cubes in 2 different colors. Printing Printing does not require any support. The stl files are intended for a layer thickness of 0.2 mm. Printing pins may require rafting if they do not adhere sufficiently to the printing surface. Assembly Printed parts Carefully separate the male elements from the female elements. A cutter may be useful to separate the A hinges. Organization of the assembly Example of organization: Assemble 2 pairs of male and female elements in the position they are printed (FA hinges with MA). Assembly is done by inserting the narrow end of the pin into the female hinge in the center of the element. A pair of pliers can be used to lock the hinge pin in its correct position. If you make a mistake, you can use the pin punch (PinPunch.stl). Open the hinges and position them like the center pieces shown above. Assemble the other 2 pairs by joining the FB and MB hinges. Be careful, due to their printing in the prone position, the holes in the B hinges may be imperfect. File the head of the pin or use a drill bit in the hinges to avoid breaking them when inserting the pin. Once assembled, if the components do not touch back to back, deburr the hinges where they attach to the workpiece. Open the hinges and position them as the parts on the left and right in the assembly diagram above. Then assemble the 4 pairs of parts together (MA hinges with FB or MB hinges with FA). Customization In the OpenScad file, the dimensions of the parts can be changed. They are calculated according to the print thickness. These dimensions must be multiples of the print layer thicknesses (epi): Side of a part = 6 hinge parts + 5 sets). Examples: | 0.12 mm | 0.12 mm | 0.2 mm | 0.2 mm | 0.2 mm | | -------------------------------------------- | ------- | ------- | ------- | ------ | ------ | ------ | | Length of a hinge element: E_epi = | 26 | 33 | 40 | 16 | 20 | 24 | | Game: j_epi = | 2 | 2 | 1 | 1 | 1 | | 19.92 | 24.96 | 30 | 20.2 | 25 | 29.8 |