Continuous Fiber Composite 3D Printing Patents 2026
Continuous Fiber Composite 3D Printing Patents
From in-nozzle impregnation to powder-coupling thermoset systems, continuous fiber composite 3D printing is maturing fast. This landscape maps 28 patent families across process hardware, path planning, and key assignees from 2015 to 2026.
How Continuous Fiber Composite 3D Printing Works
Continuous fiber composite 3D printing co-deposits uncut fiber tows — carbon, glass, aramid, or natural fibers — with a polymer matrix during layer-by-layer additive manufacturing. The dominant platform is Fused Filament Fabrication (FFF/FDM), with two hardware paradigms: in-nozzle impregnation and pre-impregnated filament extrusion.
In-nozzle impregnation merges dry fiber and thermoplastic filament inside a heated nozzle immediately before deposition, as first demonstrated at Keio University in 2016, achieving tensile strength improvements of 435% vs. unreinforced PLA. Pre-impregnated filament systems, commercialized by Markforged, feed preformed prepreg filament containing fiber already encased in matrix to a dedicated print head.
Matrix systems span thermoplastics (PLA, PA, PETG, PPS, PEEK, UHMWPE) and thermosets (epoxy resins), with bi-matrix thermoset–thermoplastic hybrids also proposed. Novel routes include continuous fiber reinforced metal matrix composites using low-melting-point alloys and scaffold composites for biomedical use.
Path planning — the algorithm controlling fiber tow deposition — is an equally active sub-domain. Stress-field-driven, topology-optimized, and curvature-aware toolpath methods appear across Chinese university patents and international literature, with Toyota Central R&D Labs applying Gray–Scott reaction-diffusion equations to generate anisotropic toolpaths for automotive applications.
Filing Activity by Jurisdiction and Technology Cluster
Among the 28 patent families retrieved, China dominates with at least 13 CN-jurisdiction patents from universities and state-linked institutes, while the US holds at least 8 active or pending patents. Activity clusters around four technology areas: in-nozzle impregnation hardware, pre-impregnated filament systems, path planning algorithms, and thermoset equipment.
Patent Filings by Jurisdiction — Continuous Fiber Composite 3D Printing Dataset
China leads with 13+ CN patents, followed by the US with 8+ active or pending patents, and Europe/International with 4 WO/EP filings from Moi Composites.
↗ Click bars to explorePatent Activity by Technology Cluster — Continuous Fiber Composite 3D Printing
Path planning and hardware (print head/nozzle) each account for significant patent clusters, while thermoset equipment and process control represent growing emerging sub-domains in the 2023–2026 period.
↗ Click bars to exploreKey Application Domains for Continuous Fiber Composite 3D Printing
Continuous fiber composite 3D printing addresses structural challenges across aerospace, automotive, robotics, and medical sectors. The following domains are explicitly cited across patents and literature in this dataset.
Aerospace Structural Components
The largest cited application domain in this dataset. The 2023 study on spatial 3D printing of continuous fiber-reinforced composite multilayer truss structures demonstrates pyramid truss structures for aerospace bearing applications, achieving equivalent compression modulus of 401.91 MPa at relative densities as low as 1.45%. The Aerospace Special Materials and Process Technology Institute (CN, 2022, active) explicitly addresses aerospace structural composites with high fiber-content continuous fiber systems.
Aerospace & DefenseAutomotive Lightweighting Applications
Multiple Chinese university patents and literature reviews cite automotive and transportation as a key growth sector for continuous fiber additive manufacturing. Toyota Central R&D Labs filed a US active patent (2021) applying Gray–Scott reaction-diffusion equations to topology-optimized stress fields for anisotropic toolpath generation, directly reflecting automotive OEM investment in fiber-reinforced structural parts to replace metal components.
AutomotiveRobotics and Industrial Equipment
The 2021 paper on combining additive manufacturing with advanced composites for highly integrated robotic structures demonstrates weight savings of 54.3% vs. aluminum for robotic arm components. A separate 2021 study on LiDAR-based multi-robot cooperation for 3D printing of continuous carbon fiber reinforced composite structures specifically targets large-scale complex spatial CFRP structures via cooperative industrial robots.
RoboticsMedical and Biomedical Scaffolds
The Kunming University of Science and Technology filed a US pending patent (2026) disclosing GO/PLA composite scaffolds produced via 3D printing for tissue engineering applications. Recyclable continuous fiber composites using UHMWPE/HDPE self-reinforced systems — studied in a 2021 literature paper on interfacial transcrystallization — also have biomedical relevance. A separate CN patent (2020) explicitly lists medical applications among targets for continuous fiber reinforced thermoplastic composite 3D printing.
Medical DevicesLeading Patent Assignees in Continuous Fiber Composite 3D Printing
Patent activity in this dataset is concentrated among Markforged (US private sector, 4 US active patents) and a cluster of Chinese universities and state-linked institutes (13+ CN patents). Moi Composites S.r.l. (Italy) is the most active European assignee, holding WO, US, and EP grants.
Top Assignees by Filing Count — Continuous Fiber Composite 3D Printing Dataset
↗ Click bars to exploreMarkforged, Inc.
Markforged holds 4 US active patents filed between 2016 and 2020, making it the most prolific single private-sector assignee in this dataset. Its patent portfolio covers multilayer 3D toolpath deposition of long fiber composite curved shells, multiaxis deposition with 100–6,000 parallel continuous axial strands in prepreg filament, and hybrid continuous/random fiber reinforcement. All four US patents are currently active.
United StatesMoi Composites S.r.l.
Moi Composites S.r.l. (Italy) holds 4 patent filings across WO (2021), US active (2022), US active (2025), and EP active (2025) for its powder-coupling continuous fiber composite equipment, which deposits matrix powder onto a filiform fiber element and uses an energy source to induce solid-to-liquid phase change for thermoset composite printing. The EP active grant received in 2025 makes Moi Composites the most visible European corporate assignee in continuous fiber composite printing equipment in this dataset.
Italy — EP / WO / USForward-Looking Signals in Continuous Fiber Composite 3D Printing (2023–2026)
The most recent filings and publications in this dataset (2023–2026) signal five forward-looking vectors: real-time process control, curved-surface deposition, thermoset equipment maturation, defect management, and recyclability.
Real-Time Intelligent Process Control
The Beihang University CN patent (filed 2026, pending) targets closed-loop, online, real-time adjustment of print parameters based on in-process sensing, moving beyond offline trial-and-error optimization. Dalian University of Technology’s US-filed patent (2023, pending) on real-time multi-parameter coordinating 3D printing auxiliary forming process reinforces this trend. Both filings indicate that intelligent forming-performance regulation is the next capability frontier for industrial-scale continuous fiber printing.
Curved-Surface and Non-Planar Fiber Deposition
The Huazhong University of Science and Technology path-planning patent (CN 2024, pending) and the earlier five-axis flax fiber printing literature (2020) converge on curved-surface deposition as the next manufacturing capability frontier. Flexural strength increased 211% and modulus 224% vs. pure PLA in the five-axis continuous flax fiber study. Non-planar deposition directly addresses the mechanical performance penalty of conventional planar slicing for curved structural components.
In-Nozzle Impregnation vs. Pre-Impregnated Filament Systems
Click any row to explore further.
| Dimension | In-Nozzle Impregnation | Pre-Impregnated Filament |
|---|---|---|
| Process Mechanism | Dry fiber tow and thermoplastic filament merged inside heated nozzle immediately before deposition | Preformed prepreg filament with fiber already encased in matrix fed to dedicated extrusion head |
| Key Example Assignee | Keio University (2016 literature); Tongji University CN patent (2019, active) | Markforged, Inc. — 4 US active patents (2016–2020) |
| Mechanical Performance | 435% tensile strength improvement vs. unreinforced PLA demonstrated (Keio University, 2016) | 100–6,000 parallel continuous axial strands per filament; curved quasi-isotropic laminates achievable |
| Primary Technical Challenge | Adequate fiber–matrix wetting within short nozzle residence time; tow breakage; nozzle clogging | Design-around constraints from Markforged IP; limited to prepreg filament geometries |
| Multi-Axis Compatibility | Compatible with five-axis and robotic 6-DOF systems (University of South Carolina, Xi’an Jiaotong University) | Demonstrated in curved-shell multilayer deposition; Markforged multiaxis US patent (2017, active) |
| Matrix Systems | PLA, PA, PETG, PEEK, thermoset epoxy (in-nozzle thermoset variants reported) | Thermoplastic prepregs (PLA, PA); thermoset hybrid approaches also proposed in literature |
| IP Landscape Risk | Lower direct IP constraint from Markforged; active CN university patents on nozzle hardware | Significant freedom-to-operate constraint from Markforged US active patents (2016–2020) |
Frequently Asked Questions: Continuous Fiber Composite 3D Printing Patents
The dominant process platform is Fused Filament Fabrication (FFF/FDM), within which two hardware paradigms are observed: in-nozzle impregnation, where dry fiber and thermoplastic are merged inside a heated nozzle before deposition, and pre-impregnated filament extrusion, where a preformed prepreg filament is fed to a dedicated print head. Both paradigms are documented across patents and literature in this dataset from 2015 to 2026.
Markforged, Inc. (US) is the most prolific single private-sector assignee in this dataset with 4 US active patents filed between 2016 and 2020, covering multilayer fiber reinforcement design, multiaxis deposition, and hybrid continuous/random reinforcement. Among institutional assignees, Chinese universities and state-linked institutes collectively account for at least 13 CN-jurisdiction patents.
The 2016 Keio University study on in-nozzle impregnation demonstrated a 435% tensile strength improvement vs. unreinforced PLA using carbon or jute fiber. A 2019 thermoset route using 3K carbon fiber impregnated with epoxy E-20 yielded tensile strength of 1,476 MPa and modulus of 106 GPa. Five-axis continuous flax fiber printing (2020) achieved flexural strength increases of 211% and modulus of 224% vs. pure PLA.
The most recent filings (2023–2026) signal five vectors: (1) real-time intelligent process control, with Beihang University’s CN 2026 pending patent targeting closed-loop online adjustment; (2) curved-surface and non-planar deposition, led by Huazhong University CN 2024 and five-axis printing literature; (3) thermoset equipment maturation, marked by Moi Composites’ US and EP active grants in 2025; (4) defect reduction and quality assurance via micro-CT and MCFA-AM; and (5) recyclability of continuous fiber composite feedstocks.
China (CN) dominates with at least 13 CN-jurisdiction patents from universities and state-linked institutes including Dalian University of Technology, Beihang University, and the Aerospace Special Materials and Process Technology Institute. The United States holds at least 8 active or pending patents from Markforged, Toyota Central R&D Labs, University of South Carolina, and Moi Composites. Europe/International has 4 WO/EP filings, led by Moi Composites S.r.l. (Italy).
Markforged’s IP position in prepreg filament deposition across multiple US active patents from 2016–2020 creates a significant freedom-to-operate constraint for competitors seeking to commercialize continuous fiber FFF printers in the US market. The dataset recommends evaluating design-around strategies, particularly for in-nozzle impregnation variants and alternative multi-axis architectures. Chinese institutional IP is also building rapidly, with over 13 CN active or pending patents covering path planning, print-head hardware, and process control.
Data and insights on this page are based on a limited patent and literature dataset and are for reference only. Figures may not represent the complete technology landscape.