Navy Funds Continuous Fiber 3D Printing Inside UAV Parts

Continuous fiber 3D printing is the shop-composites story this week, not a new desktop SKU: Continuous Composites won a U.S. Navy Phase II SBIR to put electrical paths inside load-bearing UAV structure. TCT Magazine’s September 1, 2026 report says the goal is parts that carry stress and power so a harness can come out. For a shop, that is a robotic thermoset process — not a FibreSeeker slicer toggle.

What's Happening

Continuous Composites (CCI) already sells CF3D as a six-axis robotic cell. A proprietary end effector impregnates continuous dry fiber with a snap-curing thermoset resin in one pass. Toolpaths come from CF3D Studio, which the company says includes fiber-aware paths and finite-element checks. That stack is industrial. It is not a 300 mm desktop gantry.

Phase I, per TCT and a matching 3D Printing Industry write-up, co-printed copper wiring and fiber optics inside fiberglass-reinforced panels, then ran mechanical and electrical tests. CCI says those coupons showed minimal impact on mechanical integrity. Treat that as the company’s reading of its own Phase I data, not a Navy type certificate. Phase II moves from “a panel can hold a wire” to higher-capacity conductive paths in load-bearing geometry, with electrical isolation kept by controlled placement. The clock is 30 months of materials work, process validation, and coupon or sub-scale structures, then a one-year option for a functional, system-level demonstration. CEO Steve Starner called it a shift from printing structure alone to printing function into the structure. That sentence is a vendor line. The deliverable is still a demonstration, not a squadron spare.

CCI also points to field maintenance: if power lives in the laminate, a damaged panel can be swapped without fishing a harness, and connectors see less handling abuse. That is the argument. It is not a published mean-time-to-repair number. The same company has a $1.9 million Air Force simulation contract and an Army ManTech missile-component effort. Those are adjacent programs, not proof this UAV skin is flying.

Why Continuous Fiber 3D Printing Matters for Shops

A shop that already prints composite fixtures knows the cheap version of this problem: a PETG duct that holds a cable until the zip-tie chews the corner, or a harness that snags every time someone pulls a cover. CCI’s Navy pitch is the expensive version — put the conductor in the wall so the wall is the harness. That idea is useful even if you never touch a six-axis cell. It forces a split: what is structure, what is signal, and what you still run as a service loop you can replace.

Keep the process map honest. Desktop thermoplastic continuous-tow printers lay a fiber in a polymer matrix for jigs, brackets, and load paths on a bench. They do not snap-cure aerospace thermoset, they do not steer fiber around a UAV longeron on a robot, and they do not qualify an embedded copper path for flight. Phase I used fiberglass panels. Phase II still has to show that a thicker conductor does not become a crack starter. “Minimal impact” on a coupon is not a wing-skin allowable.

How Continuous Fiber 3D Printing Differs From a Desktop Tow

Job	Typical process	What you actually get
Bench fixture / clamp	Desktop thermoplastic + continuous tow	A designed load path on a shop printer
Cable held to a cover	FFF plastic + zip-ties or clips	Serviceable, ugly, and replaceable
Phase I CCI coupon	CF3D fiberglass panel + copper / fiber optic	Company test: conductor in the laminate
Phase II target part	Same robotic cell, load-bearing geometry	Not fielded; 30-month research clock
Traditional UAV harness	Hand-built wires and connectors	Heavy, inspectable, known failure modes

What the Research Says

Swaminathan, Ozutemiz, Majidi, and Hudson built FiberWire on a commercial continuous-carbon printer: they laser-etched between fiber layers and deposited silver paste so circuitry lived inside a stiff printed object. They showed a bike handlebar with embedded controls, a golf club with an IMU, and a gamepad with a multilayer carbon-fiber circuit. The paper is explicit that in-plane fiber is much stronger than the Z direction, and that the conductors are fabricated into the print — they are not a Navy harness replacement. It is the closest peer-reviewed desktop analog to “put function in the laminate” (Swaminathan et al., 2019).

Hou, Li, Ding, Zhu, and colleagues hybrid-printed continuous carbon-fiber structural layers with silver-paste microcircuits using electric-field-driven deposition plus FDM. Embedded-microcircuit coupons heated at 5.9 °C/s, which they report as a 118.5% gain versus conventional printed CFRC, while tensile modulus and stiffness rose only about 1.5%. That is electrothermal actuation for morphing parts, not UAV power distribution, and the conductors are silver paste, not Navy copper bus. It does support the same caution CCI will have to prove in Phase II: a conductive path can sit in a continuous-fiber layup without wrecking stiffness if placement is controlled (Hou et al., 2026).

Frequently Asked Questions

What is continuous fiber 3D printing with embedded conductors?

It is a process that lays continuous fiber and resin while placing a conductive path in the same laminate, so the part can carry load and power. Continuous Composites says Phase I co-printed copper wiring and fiber optics in fiberglass panels. That is a company coupon result, not a Navy flight qualification, and not a desktop thermoplastic tow job.

Can a desktop continuous fiber printer embed copper wires like the Navy project?

No. The Navy award is for Continuous Composites’ robotic CF3D platform, a six-axis thermoset cell that steers dry fiber and snap-cures resin. A desktop printer that lays a thermoplastic tow can stiffen a fixture. It does not deposit copper or fiber optics into a UAV skin, and it does not replace a wire harness on an airframe.

How long before embedded-conductor UAV parts are fielded?

Not this quarter. TCT reports a 30-month Phase II on materials, process validation, and coupon or sub-scale structures, then a one-year option for a system-level demonstration. Treat that as research time. Do not treat a press release as a spare-parts catalog or a claim that harnesses are already gone from Navy UAVs.

Fibricate's Place in This Story

A robotic thermoset cell and a desktop thermoplastic tow answer different shop questions. Companies like Fibricate, whose FibreSeeker 3 continuous carbon fiber 3D printer lays polymer with a tow from feedstock such as the continuous carbon fiber spool, are not on this SBIR and are not printing copper into a UAV skin. Use the desktop machine when a fixture, clamp, or cover needs a designed fiber path on a bench. Leave embedded power distribution, snap-cured aerospace resin, and Navy demonstration hardware to the robotic cell that won the contract. Do not treat a printed jig as a harness, and do not treat Phase I “minimal impact” as a FibreSeeker spec.

What to Watch Next

Watch the coupon work, not the slogan. The useful public signals over the next year are isolation voltage, conductor cross-section, and whether a thicker bus starts delaminations at the fiber steers. Independent mechanical data would matter more than another “function in the structure” quote. Over 12–24 months, expect more defense programs to ask for printed composites that carry signal or power, and more shops to keep a boring, inspectable harness next to the printed part until someone publishes allowables. The split that will still matter in 2027 is parts you can swap with a torque wrench versus laminates you have to requalify if the wire inside moves.

References & Further Reading

1. Swaminathan, S., Ozutemiz, K. B., Majidi, C., & Hudson, S. E. (2019). FiberWire: Embedding Electronic Function into 3D Printed Mechanically Strong, Lightweight Carbon Fiber Composite Objects. Proceedings of the 2019 CHI Conference on Human Factors in Computing Systems.
2. Hou, Z., Li, X., Ding, H., Zhu, X., Tian, X., Shi, H., Zhu, W., Guo, R., Wang, C., & Lan, H. (2026). 4D printing of continuous fiber composites with embedded microcircuits: Synergistic enhancement of electrothermal actuation and load-bearing performance. Journal of Manufacturing Processes.
3. Continuous Composites awarded US Navy Phase II research contract. TCT Magazine. Retrieved September 3, 2026.