Scientists at Oak Ridge National Laboratory (ORNL) have unveiled a 3D printing breakthrough: a multiplexing nozzle system that overcomes scaling challenges in extrusion printing. Traditional 3D printers struggle when you increase the size or throughput; they become heavy, harder to control, and suffer unreliable flow at low speeds. The multiplexed approach addresses these issues by combining multiple extruders into a single output stream, tells Tom’s Hardware.
In the new setup, several extruders feed molten polymer to a unified nozzle. To reduce weight and maintain control, individual extruders can be temporarily shut off, or modulated, depending on the printing demand. This enables smoother flow at different speeds, while letting the system work at both high throughput and fine detail. Because the output is combined, the system can also deliver more complex material constructs, like core-and-sheath or ribbon designs, directly from the nozzle.
One of the strengths of ORNL’s method is scalability. More extruders can be added without degrading precision or control, giving designers room to grow throughput without compromising print quality. The technology is being pitched to heavy industries, especially aerospace, marine, and energy, where large, lightweight, multi-material parts are in demand.
By removing the tradeoffs between speed, size, and complexity, the multiplexed nozzle system could unlock new capabilities in additive manufacturing. Parts that once required multiple steps or tools might emerge in one pass. For sectors that rely on custom, high-performance components, this could shrink manufacturing timelines and costs.
Still, commercial adoption will need testing under industrial conditions (temperature control, material consistency, error handling). But as the printing envelope expands, multiplexing nozzles could turn from a lab curiosity into a foundational tool in large-scale, multifunctional 3D manufacturing.