A research team at MIT has developed a groundbreaking multimaterial 3D-printing system capable of producing a functional electric linear motor in approximately three hours. This innovation aims to streamline hardware production by integrating complex materials into a single printing process, addressing the limitations of traditional manufacturing methods.
Transforming Hardware Production
Most conventional 3D printers focus on creating plastic components, primarily for prototypes and decorative items. In contrast, manufacturing functional electric devices, such as motors, requires materials that serve distinct roles: some conduct electricity, while others provide insulation or support structural integrity. The new MIT platform processes five different functional materials, including conductors, magnetic structures, and flexible components, to create a fully operational electric motor.
The cost of producing the motor is remarkably low, with raw materials priced at around USD $0.50. The researchers envision this technology as a means to make hardware engineering cheaper and faster, while also minimizing vulnerabilities associated with global supply chain disruptions. Traditional electric motors are typically assembled from multiple components, which involves several fabrication steps. The MIT system simplifies this by printing functional structures in a single build, requiring only one post-printing step to magnetize the motor’s hard magnetic parts.
Innovative Multimaterial 3D Printing
3D printing has advanced significantly since its inception, yet many printers remain limited to single-material designs tailored for plastics. Even those labeled as “multi-material” often operate with similar polymers, rather than incorporating diverse materials. According to Luis Fernando Velásquez-García, the principal research scientist leading the study, “Very few applications can be satisfied with just one material. If you want to make hardware that actually does something well, it usually requires different materials.”
The MIT team’s prototype printer utilizes four specialized tools to handle feedstocks with varying properties, including a heater for curing ink, a filament extruder, a custom ink extruder, and a modified pellet extruder. The latter is particularly advantageous, as it allows for higher concentrations of magnetic particles, enhancing the performance of printed components.
Velásquez-García emphasizes the importance of using high-quality materials, stating, “You shouldn’t make any compromises in materials and performance. The goal should be to deliver hardware that does what people want.” By ensuring that only capable materials are employed, the potential for printed devices is significantly expanded.
Precision is crucial in this process. Conductive inks require specific curing conditions to prevent damage to insulating materials, and successful operation hinges on the accurate alignment of each layer. The MIT team has implemented a strategic sensor setup and control system to allow their robotic arms to interchange tools reliably.
In its demonstration, the MIT team showcased a linear motor, commonly used in high-precision applications such as robotics and medical imaging. The prototype system, which combined off-the-shelf components with custom parts, was built at a cost of “on the order of a few thousand dollars.” The printed motor not only matched but in some aspects surpassed the performance of motors created through conventional multi-step methods. It also produced more actuation compared to traditional linear systems that rely on hydraulic amplifiers.
While the current focus is on linear motors, the team aims to extend their research to more complex rotating motors used in applications like electric vehicles. Velásquez-García remains cautious, noting that significant challenges remain. “There’s a long way between what we have and a 3D-printed engine in an electric car,” he remarked. “We’re far from that because we would need to make something that rotates and can deal with the temperature, load, and other factors.”
Future objectives for the research team include incorporating magnetization directly into the printing process and expanding the system’s capabilities with additional tools. Ultimately, they aspire to demonstrate fully 3D-printed rotary motors, paving the way for more complex electronic systems to be produced rapidly and locally.
With this innovative approach, engineers could potentially fabricate specialized components in remote locations without reliance on traditional manufacturing hubs, revolutionizing the hardware production landscape.
