University of Maine Launches 30-Foot 3D-Printed Boat That Hits 40 Knots

A 30-Foot Boat Printed at 500 Pounds per Hour

The University of Maine's Advanced Structures and Composites Center launched the 3Dirigo X, a 30-foot vessel built almost entirely by large-scale additive manufacturing. In open-water trials the boat reached speeds approaching 40 knots, a figure that would look impressive for a conventionally built craft and is remarkable for something squeezed out of a giant nozzle.

This is not the ASCC's first record. The original 3Dirigo earned a Guinness World Record in 2019 as the largest 3D-printed boat. That prototype proved a massive polymer part could float. The 3Dirigo X is something else: a vessel designed from the start to survive violent dynamic loads, high speeds, and real ocean conditions.

From 20 Pounds per Hour to 500

The speed of the print itself tells the story. When the ASCC first began large-scale additive manufacturing, its printers deposited material at roughly 20 pounds per hour. Today the system runs at 500 pounds per hour. The team expects that figure to double again once the new GEM facility opens with federal backing from Senator Susan Collins. At 1,000 pounds per hour, the economics of maritime manufacturing change completely.

The printer uses a bio-based thermoplastic composite that blends polymers with wood cellulose and forest byproducts. That makes the hull recyclable and ties the supply chain to Maine's timber industry instead of overseas petrochemical suppliers. It also replaces fiberglass with a material that does not require the same toxic resins or single-use molds.

Digital Manufacturing Means No New Molds

Traditional shipyards cut aluminum or fiberglass molds for every hull shape. Change the mission profile and you must build a new mold from scratch. Digital manufacturing removes that bottleneck. Engineers tweak the CAD file, change the material formulation, and print a new hull without retooling.

For the Navy and coast guard, that flexibility is worth more than speed. A patrol craft, a logistics vessel, or an uncrewed sensor platform can each come from the same machine with minimal changeover time. The ASCC's MasterPrint system can produce structures up to 100 feet long, 20 feet wide, and 10 feet tall.

Still a Research Project, Not a Product

Keith DeVries, Manufacturing Technology Director at the Office of the Secretary of Defense, was clear about the current status: "This is not a finish line. This boat just started a new journey, being run through its paces to evaluate its suitability in the waters of the Atlantic, its ability to stand up over time, over stress."

The ASCC is using digital twin technology to feed real-world test data back into its models. Every hour the 3Dirigo X spends in rough water improves the next design. That loop is the real breakthrough.

What It Means for 3D Printing

Large-scale additive manufacturing has spent years as a technology demo. The 3Dirigo X signals that it is entering production. The combination of speed, sustainable materials, and on-demand design makes it a credible alternative to traditional composite boat building. If the GEM facility hits its 1,000-pounds-per-hour target, expect to see larger naval and commercial vessels printed rather than assembled.