DLR Advances Hybrid 3D Printed PEEK Structures for Lightweight Aerospace Manufacturing

Updated on May 20, 2026 • 6 min read

The German Aerospace Center, DLR, is advancing a new generation of lightweight aerospace structures by combining 3D printed PEEK, thermoplastic laminates and automated fiber placement.

The work is being carried out by the DLR Institute of Structures and Design, where researchers are developing monolithic and hybrid lightweight construction methods for aerospace, transport systems and aircraft engines.

The goal is straightforward but technically demanding:

👉 make future aircraft structures lighter, more functional and easier to manufacture.

Why 3D printed PEEK matters

PEEK, or polyether ether ketone, is one of the most important high-performance thermoplastics used in advanced engineering.

It offers:

• high heat resistance
• strong chemical resistance
• good mechanical strength
• low weight
• excellent aerospace suitability
• compatibility with complex geometry design

In additive manufacturing, PEEK allows engineers to create shapes that would be difficult or impossible using conventional molding or machining.

However, there is still a limitation.

3D printed PEEK parts alone usually do not yet reach the mechanical performance required for primary aerospace structures, especially when compared with injection-molded or fiber-reinforced composite components.

That is why DLR is not treating 3D printing as a standalone solution. Instead, it is combining it with composite laminates and fiber placement.

Hybrid manufacturing: printed PEEK + thermoplastic laminates

DLR’s approach uses in-situ bonding of 3D printed PEEK onto thermoplastic laminate structures.

This creates a hybrid part where:

• the laminate provides structural strength
• the printed PEEK creates complex geometry
• the combined system enables lightweight functional integration

The manufacturing chain combines:

• AFP — automated fiber placement
• FGF — fused granular fabrication
• scanning and digital alignment
• conformal slicing software
• robotic deposition

This combination allows engineers to add complex structural features directly onto curved composite panels.

Solving the tooling problem

One of the biggest cost drivers in aerospace composite manufacturing is tooling.

For complex parts such as curved sandwich panels, dedicated tools are often needed for lamination and assembly. These tools can be expensive, time-consuming and difficult to modify.

DLR’s approach reduces this burden by enabling direct 3D printing onto tooling or existing composite surfaces.

This can help reduce:

• tooling cost
• development time
• manual assembly
• part count
• design restrictions

For aerospace development, where designs evolve frequently, this flexibility is extremely valuable.

Printing structural features directly onto aircraft skins

One important application is the direct integration of structural elements into aircraft outer skins.

For example, stringers can be printed directly onto a wing or fuselage skin.

These printed stringers can provide:

• local reinforcement
• stiffness improvement
• geometric customization
• functional channels
• feed-throughs for media
• integrated supply lines

This means the printed structure is not only a stiffening feature. It can also become a functional element inside the aircraft architecture.

AFP adds stiffness after printing

After the base stringer geometry is printed onto the outer skin, carbon fiber tape can be applied using automated fiber placement.

This step significantly increases stiffness.

The process works in stages:

1. Print the base PEEK stringer geometry.
2. Scan the real surface geometry.
3. Align the digital model with the physical component.
4. Apply carbon fiber tape as reinforcement.
5. Print additional PEEK material in-situ onto the existing structure.

This creates a hybrid reinforced structure that combines the geometry freedom of additive manufacturing with the stiffness and strength of continuous fiber composites.

Why scanning is critical

For curved aerospace structures, the real part geometry may not perfectly match the original CAD model.

Small deviations can affect:

• layer adhesion
• toolpath accuracy
• surface conformity
• bonding quality
• final mechanical performance

DLR therefore uses scanning to capture the actual mold or component surface.

The scan data is imported into slicing software, allowing the robot path to follow the real surface normals.

This is especially important for conformal printing on curved panels.

Without this step, the first layer may not bond properly, which would compromise the entire structure.

Aibuild software supports conformal slicing

Slicing plays a central role in this process.

DLR used Aibuild software to create toolpaths for complex curved geometries.

The software enabled:

• surface scan import
• alignment of printed geometry
• conformal slicing
• path generation for curved panels
• spiralized printing of double-wall geometries
• improved control of nozzle orientation

For complex aerospace structures, this kind of digital workflow is essential.

It allows engineers to move beyond flat-layer printing and toward true robotic conformal additive manufacturing.

Why this matters for aerospace lightweighting

Aircraft manufacturers are under pressure to reduce:

• weight
• fuel consumption
• emissions
• part count
• assembly time
• production cost

Hybrid thermoplastic composite manufacturing offers a promising route.

By combining printed PEEK with AFP-reinforced laminates, DLR’s method could support:

• lighter aircraft skins
• integrated stiffeners
• fewer mechanical fasteners
• reduced tooling requirements
• faster design iteration
• functional structural parts

This is especially important for future aircraft platforms where every kilogram saved contributes to lower energy consumption.

Thermoplastic composites offer another advantage

Thermoplastic composites are increasingly attractive because they can be:

• reheated
• welded
• reshaped
• repaired
• recycled more easily than thermosets

This makes them valuable for next-generation aircraft structures, where sustainability and manufacturing efficiency are becoming as important as mechanical performance.

The ability to weld or bond printed PEEK directly onto thermoplastic laminates could help create more integrated structures with fewer secondary joining operations.

🔒 Content Transparency & Editorial Integrity

This article is developed based on real engineering experience, machine testing data, and practical production knowledge from Jota Machinery’s work in advanced composite manufacturing.

All technical explanations—including material structure, processing methods, and performance characteristics—are reviewed and verified by our engineering team to ensure accuracy and real-world relevance.

To improve clarity and structure, AI-assisted tools may have been used during content organization and language refinement. However:

• All key technical insights originate from first-hand industrial experience
• All data and claims are manually reviewed and validated
• The content is created with the primary goal of educating engineers, manufacturers, and buyers

We do not publish content solely for search ranking purposes. Every article is designed to provide practical, experience-based value to professionals in the composite materials industry.

Editorial perspective

DLR’s work is important because it does not treat additive manufacturing as a replacement for composite manufacturing.

Instead, it shows a more realistic industrial direction:

👉 additive manufacturing and continuous fiber composites working together.

3D printed PEEK provides geometry freedom.
AFP provides structural reinforcement.
Scanning provides accuracy.
Conformal slicing connects the digital model to the real part.

That is the real breakthrough.

For aerospace, the future of lightweight structures will likely depend on these hybrid workflows, where printing, fiber placement, digital scanning and thermoplastic bonding become part of one connected manufacturing system.