Johnson Polyhedra Duals 3D Printer Model

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License: CC BY
File formats: stl,zip
Download type: zip
Size:298.1KB

The file 'Johnson Polyhedra Duals 3D Printer Model' is (stl,zip) file type, size is 298.1KB.

Summary

Here are the 92 Duals of the Johnson Polyhedra, see thing:16508. They were constructed by the method described in thing:30958, Duals of Polyhedra.

You can read about duals on Wikipedia or on the dual page at George Hart's Virtual Polyhedra Site, see

http://www.georgehart.com/virtual-polyhedra/duality.html

Simply put if object A is transformed to object B by some process and if B is tranformed back to A by the same process, A and B are duals. In this case A and B are different but related polyhedra. The vertices of A become the faces of B and vice versa.

Ninety-two are too many polyhedra to show here though all are printable. It seemed better to present a few examples of the orginal Johnson polyhedra together with their duals to show how the process works. Compounds of the duals and their polyhedra are included as they are helpful in understanding the relationships. In the compounds the vertices of the original polyhedron protrude from the faces of the dual.

Stl files are:

Example 1: J9.stl, J9_dual.stl and compound_j9.stl

Example 2: J12.stl, J12_dual.stl and compound_j12.stl

Example 3: J16.stl, J16_dual.stl and compound_j16.stl

The fortran program that produced the openSCAD programs and the openSCAD programs that generated the duals are included in johnson_duals_scad.zip. The stl files of all the duals are included in johnson_duals_stl.zip

compound_j12.stl 13.4KB
compound_j16.stl 41.0KB
compound_j9.stl 39.5KB
j12.stl 1.5KB
j12_dual.stl 2.0KB
j16.stl 5.0KB
j16_dual.stl 8.4KB
j9.stl 4.5KB
j9_dual.stl 7.4KB
johnson_duals_scad.zip 136.2KB
johnson_duals_stl.zip 160.6KB