MIT Breakthrough: Single-Step 3D Printing Poised to Transform Electric Machine Production

Manufacturing disruptions caused by broken machine parts can lead to significant production delays. Current methods for fabricating electric machines often require specialized equipment and complex processes, limiting production to specific manufacturing centers and prolonging repair times if replacement parts are unavailable. This challenge is now being addressed by groundbreaking research from MIT.

Key Innovation: Single-Step 3D Printing for Electric Machines

MIT researchers have developed a multimaterial 3D-printing platform designed to enable the single-step fabrication of electric machines. This innovative system utilizes four extrusion tools capable of processing diverse functional materials, including electrically conductive and magnetic substances. The printer precisely layers these varied materials by switching between extruders.

This development marks a significant step towards enabling onsite production and reducing reliance on global supply chains for critical components.

Technical Deep Dive: A Multi-Material Extrusion Breakthrough

The foundation of this research is extrusion 3D printing, a method that involves depositing material through a nozzle, layer by layer. Fabricating complex electric machines necessitates the seamless switching between multiple materials, each with distinct functionalities—such as electrically conductive and hard magnetic materials.

Traditional multimaterial extrusion systems are often limited, typically supporting only two materials of the same form. To overcome this, the MIT team engineered a novel system featuring four extruders, each specifically designed to handle a different type of feedstock.

Crucially, each extruder was tailored to accommodate specific material requirements. For instance, the system can harden conductive inks without excessive heat or UV light, which could otherwise degrade sensitive dielectric materials. Furthermore, integrated sensors and a sophisticated control framework ensure precise tool handling and nozzle movement, vital for accurate material layering and ultimately, the high performance of the fabricated devices.

Demonstration and Impressive Performance

The MIT team successfully showcased their platform by fabricating a fully functional electric linear motor in approximately three hours. This type of motor, which produces straight-line motion, is commonly used in critical applications like robotics and conveyor systems.

Remarkably, the only post-printing step required for full functionality was the magnetization of the hard magnetic materials. The material costs for this complex device were estimated at a mere 50 cents per device.

The 3D-printed motor demonstrated significantly greater actuation compared to certain linear engines dependent on hydraulic amplifiers, highlighting its impressive capabilities.

The Road Ahead: Transforming Hardware Manufacturing

Luis Fernando Velásquez-García, a principal research scientist at MIT's Microsystems Technology Laboratories (MTL) and senior author of the paper published in Virtual and Physical Prototyping, underscored the profound impact of this work. He stated that this development demonstrates the feasibility of fundamentally changing hardware manufacturing by enabling onsite production and reducing reliance on global supply chains.

Lead author Jorge Cañada and Zoey Bigelow, both EECS graduate students, co-authored the groundbreaking paper.

Future research is already underway, focusing on key advancements:

• Integrating the magnetization process directly into the extrusion.
• Developing 3D-printed rotary motors.
• Expanding the platform's capabilities to fabricate even more complex electronic devices.

This research received funding support from Empiriko Corporation and the La Caixa Foundation.