MIT Origami Method Builds Structures 3.5 Times Stiffer With Two-Thirds the Material

"This helps us build strong structures while minimizing the amount of material we are using," Parra Rubio said. The rigid blocks connect into interwoven beams that form a 3D structure with high stiffness at very light weight.

How does the design automation work?

Designing polygonal blocks by hand to meet a client's constraints would be, in the researchers' words, enormously challenging. So Parra Rubio partnered with CBA graduate student Erik Strand to build an automated solver that generates manufacturable unit cells for a user's desired structure.

"On the computational part, we break this big problem down into many small subproblems. Now, we solve each cell independently to make sure that it is foldable, and then we globally assemble them after that," Strand said.

The solver's output feeds directly to a CNC milling machine. That closes most of the gap between design and fabrication that normally involves separate handoffs among design, engineering, fabrication, and construction teams.

James Coleman, SM '14, MArch '14, cofounder of the installation specialty firm SumPoint, and who was not involved in the research, said the work "maintains a seamless digital thread from design through erection, enabling unprecedented customization while ensuring precise execution." In industry, he noted, each handoff between teams creates openings for miscoordination, rework, and loss of design intent.

Why is assembly foolproof?

The unit cells adjust naturally into their correct shape during assembly, so the structure can only exist in one configuration. "The connection is the same everywhere, even though each unit cell is different," Parra Rubio said. That uniformity, the researchers argue, makes the process faster, cheaper, and harder to get wrong than some conventional construction.

Stiffness figures come from simulations, a caveat worth noting; physical testing beyond the prototypes and the library sculpture has not yet been reported. Strength, in Parra Rubio's phrasing, is sufficient for "some architectural applications" — a hedged claim, not a certified building code.

Where could it be used first?

The team points to several near-term applications:

• Disaster relief shelters shipped as flat panels and erected quickly at earthquake or flood sites
• Strong, lightweight components for airplanes and modular robots
• Sound-dampening panels and building facades

Next steps include testing on larger architectural structures, exploring unit cells with more complex geometries for greater strength, and building a user-friendly design interface.

"This work shows that folding metal is a method that is ready to be used for building structures. We can do it big enough and strong enough, now that we can bring it out of the lab and to the construction site," said senior author Neil Gershenfeld, MIT professor and director of the CBA.

The paper's co-authors also include Riccardo Foschi of the University of Bologna and Rupert Maleczek of the University of Innsbruck. Funding came partly from the Center for Bits and Atoms Research Consortia, the University of Bologna, and the Austrian Research Agency.

For now, one claim stands on physical record: a room-sized aluminum lattice, folded and bolted by amateurs in days, hanging in a public library.