MIT's new 3D printer can create a working electric motor in one go

A 50-cent motor rolls off a 3D printer at MIT, complete with moving parts and ready to run after a single magnetization step. Researchers have cracked one of additive manufacturing's toughest puzzles by building a system that can print five different materials simultaneously, from conductive pathways to magnetic components, creating fully functional electric motors without assembly.

The breakthrough required juggling incompatible materials that typically don't play well together. Conductive inks need pressure-based dispensing while plastics require heat, and even tiny misalignments between tool changes can destroy the delicate internal architecture.

MIT's solution uses four specialized nozzles guided by sensors that ensure precise placement layer after layer. The team demonstrated their approach with linear motors, the type used in robotics where straight-line precision matters more than spinning speed.

The printed motors performed as well as traditionally manufactured versions, opening possibilities for on-site prototyping and emergency replacements without supply chain delays. Next up: integrating magnetization directly into the printing process and tackling the more complex challenge of rotary motors.