Instructions
http://web.eecs.utk.edu/~jplank/plank/origami/penultimate/intro.html https://origamiusa.org/catalog/products/many-modes-origami-models-pdf
Model details: Penultimate Unit (by: Robert Neale)
See also: Menger Sponge (level 1½), Rhombicuboctahedron, Spiked Icosahedron, Steinhaus Puzzle, Truncated Icosahedron, Truncated Octahedron, Dodecahedron with prisms on all faces, Octahedral Lattice, Decorated Icosidodecahedron, Icosahedron, Modified Buckyball (120 edges), Decorated Dodecahedron, Golden Ball, Pentagonal Snowflake, Decorated rhombicuboctahedron, Snub Cube, Cube (Penultimate Unit), Dodecahedron (Penultimate Unit)
Model types: single unit
Location: on this page, on other website, in print media
Type: Phototutorial, Step-by-step diagram

108° variant (for edges of pentagonal faces), side view 108° variant (for edges of pentagonal faces), back 90° variant (for edges of square faces), side view 90° variant (for edges of square faces), back 120° variant (for edges of hexagonal faces), side view 120° variant (for edges of hexagonal faces), back Usage example: Dodecahedron Usage example: Cube Usage example: Truncated Icosahedron Usage example: Menger Sponge Usage example: Decorated Icosidodecahedron Usage example: Decorated Rhombicuboctahedron
Images are licensed under the Creative Commons Attribution-NonCommercial 4.0 International License

Online and in print

Instructions for the Penultimate System can be found online on Jim Plank’s page as well in Robert Neale’s own e-book, Many Modes of Origami Models.

Phototutorials of basic module and variations

These phototutorials for selected variants of the unit were made with permission from Robert Neale. They are split into several series:

Note that the most interesting solids can be made by combining units with different angles, units that have different angles at each end, sometimes even combining Penultimate Units with completely different kinds of units.

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