ORNL has developed a modular extrusion system that combines multiple 3D printers into one stream, enabling faster and lighter manufacturing.
Researchers at the Department of Energy’s Oak Ridge National Laboratory have unveiled a new extrusion system that could reshape large-scale 3D printing.The technology combines multiple smaller extruders into a single, high-output material stream using specially engineered nozzles.
The approach delivers the speed of large extruders while retaining precision, flexibility, and multi-material control.The system addresses a long-standing tradeoff in extrusion-based additive manufacturing. Large extruders push high volumes of material but add weight and reduce accuracy.Smaller extruders offer control but struggle to scale. ORNL’s solution aims to bridge that gap without forcing manufacturers to compromise.Solving scale tradeoffsLarge extrusion heads place heavy demands on gantries and robotic arms. Manufacturers often need stronger, more expensive motion systems to carry them.As output rises, flow consistency drops during low-volume printing. That inconsistency limits part quality and design flexibility.The problem becomes more severe with tapered or mixed-scale parts. Operators must slow printing speeds to prevent heat buildup, warping, or print failure.These constraints reduce throughput and increase costs.ORNL’s modular system takes a different approach. Instead of one oversized extruder, it combines multiple smaller units. Users can activate or deactivate extruders as needed.Output scales up without sacrificing control or adding excess weight.“By enabling smaller-scale extruders to match the output of larger systems without the burden of extra weight — and by achieving unprecedented multi-material extrusion within the bead — this system is poised to redefine extrusion-based additive manufacturing,” said ORNL researcher Halil Tekinalp, who led the project. He added that the technology could help strengthen U.S. manufacturing competitiveness.The system’s most distinctive feature lies in its ability to print multiple materials simultaneously. Traditional systems require tool changes or separate print passes. ORNL’s design merges materials inside a single extrusion bead.The core innovation centers on patent-pending nozzle blocks. Engineers built them from aluminum bronze to improve strength and thermal conductivity. Inside the nozzle, molten polymer streams merge from parallel extruders before deposition.A Y-shaped internal channel reduces center porosity and improves bead quality.Tests show the design consistently doubles material flow. Researchers believe future configurations could triple or quadruple output.The team also developed a proprietary nozzle that produces core-and-sheath beads. One material forms the core while another encases it. This structure allows precise control over mechanical and functional properties.Manufacturers can combine rigid and flexible polymers in a single pass.The design also improves interlayer adhesion. That directly addresses delamination, a persistent issue in polymer additive manufacturing.“This innovation opens up new manufacturing horizons, making it possible to achieve complex, efficient and creative designs with dynamic material switching, all while preventing cross contamination — meaning the distinct materials remain pure and do not mix unintentionally,” said Vipin Kumar, another technical lead on the project.Industrial impact potentialThe technology opens doors across multiple industries. Aerospace teams could print crash-resistant panels or radar-absorbing components. Energy developers could produce flame-resistant enclosures or modular housing elements.Defense applications include lightweight shelters and protective structures printed in one continuous build.Civil infrastructure could benefit from reinforced bridge decks, vehicle bumpers, or boat hulls.By combining speed, precision, and material versatility, ORNL’s system positions extrusion printing for broader industrial adoption.The lab views the approach as a step toward scalable, flexible manufacturing systems built for modern production demands.
Additive Manufacturing Extrusion System Oak Ridge National Laboratory ORNL
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