A broken motor in an automated machine can bring a busy factory floor to a halt, costing manufacturers valuable time and money. Traditionally, replacing these specialized parts meant lengthy delays while waiting for shipments from distant distributors. But what if those parts could be created on demand, directly within the factory itself? Researchers at MIT believe they’ve taken a significant step toward that future with a new multimaterial 3D-printing platform capable of fabricating complex electric machines in a single process.
The innovation promises to democratize manufacturing, reducing reliance on global supply chains and enabling rapid customization of electronic components for a wide range of applications, from robotics to medical devices. This new approach tackles a key challenge in additive manufacturing: the ability to seamlessly integrate diverse materials – conductive, magnetic, and insulating – into a single, functional device. The team’s perform, detailed in a recent paper published in Virtual and Physical Prototyping, demonstrates the feasibility of creating a fully 3D-printed electric linear motor with performance comparable to conventionally manufactured counterparts.
Building a Multimaterial 3D-Printing Platform
The core of the MIT team’s breakthrough lies in their customized extrusion 3D-printing system. Extrusion 3D printing, a well-established technique, involves layering materials by squeezing them through a nozzle. However, most existing multimaterial systems are limited to just two materials in similar forms, like filaments or pellets. To overcome this limitation, the researchers retrofitted an existing printer with four independent extruders, each capable of handling different material types and feedstocks.
“There were significant engineering challenges,” explains Luis Fernando Velásquez-García, a principal research scientist in MIT’s Microsystems Technology Laboratories (MTL) and senior author of the paper. “We had to figure out how to marry together many different expressions of the same printing method – extrusion – seamlessly into one platform.” The team carefully designed each extruder to accommodate the specific requirements of the materials, ensuring compatibility and optimal performance. For example, electrically conductive inks, which require a pressure-based extrusion system, were integrated alongside extruders designed for heated filaments and pellets.
Precise control was paramount. The platform utilizes strategically placed sensors and a novel control framework to ensure accurate positioning of the robotic arms and nozzles, guaranteeing layer alignment and preventing performance-derailing misalignments.
From Platform to Functional Motor
To validate their system, the researchers fabricated a linear motor – a device that generates straight-line motion, commonly used in applications like pick-and-place robotics and baggage conveyers. The motor was constructed using five different materials and took approximately three hours to print. Remarkably, the only post-processing step required was the magnetization of the magnetic materials to activate the motor’s functionality.
The resulting 3D-printed motor demonstrated performance equal to, and in some cases exceeding, that of similar motors manufactured using more complex and time-consuming methods. The researchers estimate the material cost for each device to be around $0.50, a significant reduction compared to traditional manufacturing processes. This cost estimate is based on current material pricing and may vary depending on scale and supplier.
“Even though we are excited by this engine and its performance, we are equally inspired because What we have is just an example of so many other things to come that could dramatically change how electronics are manufactured,” says Velásquez-García.
The Future of On-Site Hardware Production
The MIT team’s work represents a significant step toward a future where hardware can be produced on-site, on demand. Future research will focus on integrating the magnetization step directly into the 3D-printing process, expanding the platform’s capabilities to fabricate rotary electric motors, and adding more tools to enable the creation of even more complex electronic devices. The potential impact of this technology extends beyond cost savings and reduced lead times. it could also foster greater innovation and customization in a wide range of industries.
This advancement in 3D printing in manufacturing could reshape supply chains and empower businesses to respond more quickly to changing market demands. The ability to rapidly prototype and produce customized components could accelerate product development cycles and unlock new possibilities in fields like robotics, aerospace, and healthcare. As the technology matures, we can expect to see even more sophisticated applications emerge, further blurring the lines between design and production.
What are your thoughts on the potential of on-demand hardware manufacturing? Share your comments below and let us know how you see this technology impacting your industry.
