MIT's Bifur-Circuits Are Printable Blocks That Change Shape

Most furniture stays the shape it ships in. A chair is a chair until you throw it out. Researchers at MIT's Computer Science and Artificial Intelligence Laboratory want something more flexible, and their latest project shows how close they are getting.

Print, Snap, Sense

Bifur-circuits are small 3D-printed blocks built around auxetic lattice structures. Auxetic materials widen when you stretch them instead of thinning like a rubber band. Each unit can sit in three stable positions. Push it hard enough and it snaps into the next one, a bit like a ruler that suddenly bends when you press the middle.

The clever part is not the snapping. It is the sensing. The blocks are printed with flexible TPU hinges, stronger PLA connectors, and conductive filament traces. When two blocks meet in a particular orientation, tiny contact pads close and create a unique electrical signature. A controller at the base scans the network and figures out the current shape, all without extra wires.

From Table to Chair

That matters for reconfigurable furniture. The team printed a 24-unit demo that turns from a flat panel into a tea table, then folds into a chair with a storage hole. They also built a game controller that changes which game it launches based on how it is folded.

The project uses a Fusion 360 design tool to set joint size, thickness, and stiffness, then exports files for multi-material printers. You can even drop small magnets into pockets during printing to lock preferred poses more firmly. After more than 10,000 compression cycles the contacts still worked.

Not Flat-Pack Yet

Bifur-circuits will not show up at IKEA next year. Multi-material printing with conductive filament is still finicky, and scanning a large assembly takes a few seconds. But the idea of printable parts that know their own shape is a useful step past the usual rigid assemblies that dominate 3D printing.