Before-and-after stills from the video "An End-to-End Approach to Making Self-Folded 3D Surface Shapes by Uniform Heating." The left image shows the self-folding sheet for a humanoid shape, while the right image shows the completed self-folded humanoid shape. Courtesy of the researchers
Before-and-after stills from the video “An End-to-End Approach to Making Self-Folded 3D Surface Shapes by Uniform Heating.” The left image shows the self-folding sheet for a humanoid shape, while the right image shows the completed self-folded humanoid shape. Courtesy of the researchers
New algorithms and electronic components could enable printable robots that self-assemble when heated.

In two new papers, the researchers demonstrate the promise of printable robotic components that, when heated, automatically fold into prescribed three-dimensional configurations.

One paper describes a system that takes a digital specification of a 3-D shape — such as a computer-aided design, or CAD, file — and generates the 2-D patterns that would enable a piece of plastic to reproduce it through self-folding.

The other paper explains how to build electrical components from self-folding laser-cut materials. The researchers present designs for resistors, inductors, and capacitors, as well as sensors and actuators — the electromechanical “muscles” that enable robots’ movements.

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