Why Aerospace is Shifting to Additive Manufacturing
The market for metal 3D printing in aerospace has moved far beyond the “hype cycle.” With the metal Additive Manufacturing (AM) market surpassing $11 billion and aerospace applications accounting for roughly 34% of that activity, the technology has graduated from R&D labs to serial production lines. Major OEMs like Airbus and Honeywell aren’t just prototyping anymore; they are validating flight-critical components for airworthiness.
By 2035, industry analysts project that SLM (Selective Laser Melting) manufacturing demands will constitute nearly 30% of the market. Key leading suppliers such as EOS, SLM Solutions and 3D systems are pushing multi-laser and large format development with better process monitoring. However, for the aerospace engineer or supply chain lead in 2026, success isn’t about printing impossible shapes for the sake of novelty. It is about utilizing SLM to solve critical supply chain bottlenecks, reduce lead times, and eliminate material waste.
Cost Analysis: Reducing Buy-to-Fly Ratios with Metal AM
To understand the ROI of AM, we must look at the hidden costs of traditional subtraction.
The Hidden Cost of CNC
Traditional CNC machining of flight-critical alloys, such as Titanium (Ti-6Al-4V), is notoriously inefficient regarding raw material usage. It is not uncommon to see a “Buy-to-Fly” ratio of 10:1 or even 20:1. This means procurement must purchase 20kg of expensive billet to fly a single 1kg part, turning 95% of that aerospace-grade metal into swarf (scrap). This drives up costs not just in material, but in tool wear and machining hours.
The SLM Solution: Material Efficiency
Selective Laser Melting (SLM), a specific type of Laser Powder Bed Fusion (LPBF), fundamentally flips this equation. By building components layer-by-layer, SLM achieves near-net-shape geometries. The Buy-to-Fly ratio typically drops to around 1.5:1 (accounting for support structure removal and surface finishing).
Case Study: Liebherr-Aerospace
Challenge: A primary flight control hydraulic valve block was traditionally machined from a massive titanium forging, requiring extensive milling and cross-drilling.
SLM Application: Liebherr utilized SLM technology to print the valve block directly.
Results: They achieved a 35% weight reduction and consolidated complex assemblies into a single unit. Crucially, they eliminated the need for complex cross-drilling, which minimized potential leak paths. This proved SLM’s viability for high-pressure, flight-critical hydraulic systems.
Metal 3D Printing vs. Conventional Manufacturing for Aerospace
| Feature | CNC/ Forging | Metal Additive Manufacturing |
| Geometry Complexity | Limited by tool access and assembly requirements. | High. Enables lattices, internal cooling channels, and topology optimization. |
| Material Efficiency | Low. High waste (often 80%+ in complex aero parts). | High. Low buy-to-fly ratio (near-net-shape). |
| Lead Time (Low Vol) | Weeks or months for tooling, dies, and fixturing. | Days. Digital inventory allows on-demand production. |
| Material Properties | Proven data; standard qualification paths. | Matches or exceeds wrought properties (with proper HIP treatment). |
| Scalability | Excels in high-volume serial production. | Best for low-to-medium volume, custom, or complex parts. |
| Post-Processing | Minimal (often finished off the machine). | Moderate. Requires support removal, heat treatment, and surface machining. |
Technology Selection: LPBF, DED, and EBM Explained
Not all metal 3D printing technologies are equal. Selecting the right modality depends on the specific mechanical requirements and scale of the component.
Laser Powder Bed Fusion
This is the standard for high-precision aerospace components.
Best for: Complex internal channels (fuel nozzles, manifolds), lightweight brackets, and high-resolution features (Ra 5–15 µm).
Equipment Note: Systems like the Matrix SLM 3D Printer series are designed to handle reactive powders safely, ensuring the inert atmosphere required for aerospace-grade Titanium.
Directed Energy Deposition
Think of DED as automated welding. It blows powder into a laser path to melt it onto a surface.
Best for: Large structural components (>1 meter), MRO (Maintenance, Repair, and Operations) such as repairing worn turbine blades, or adding features to existing forged parts.
Electron Beam Melting
Uses an electron beam in a vacuum.
Best for: Brittle alloys like Titanium Aluminide (TiAl) used in low-pressure turbine blades. The vacuum environment prevents oxygen uptake, and the “hot process” (high chamber temp) significantly reduces residual stress compared to laser-based methods.
Certified Aerospace Materials: Titanium, Inconel, and Aluminum Alloys
One of the biggest hurdles for engineers is confidence in material properties. Modern SLM materials now meet rigorous AS9100D and ISO/ASTM 52900 standards.
Titanium Ti-6Al-4V: The industry workhorse. SLM-printed Titanium can achieve mechanical properties superior to casting and comparable to wrought material when subjected to Hot Isostatic Pressing (HIP) to close internal micropores.
Inconel 718: Essential for the “hot section” of engines. SLM allows engineers to print monolithic combustion chambers that handle temperatures >700°C. This eliminates the failure points found in traditional welded assemblies.
Aluminum Scandium (Scalmalloy®): An SLM-specific win. This high-performance alloy offers the specific strength of Titanium with the lightweight characteristics of Aluminum—a combination impossible to achieve with traditional casting alloys like AlSi10Mg.
Real-World Applications: Aerospace Case Studies
Beyond Liebherr, the industry is seeing widespread adoption for various use cases:
Relativity Space (Terran R): They utilize massive DED “Stargate” printers to print primary tank structures. This reduces part counts by orders of magnitude compared to traditional riveted aluminum structures.
F-35 Lightning II: The US Marines have successfully utilized field-deployable printing to produce landing gear door bumpers. This bypassed long OEM supply chain lead times, saving approximately $70,000 per assembly and keeping aircraft mission-ready.
Next Steps
Metal 3D printing in aerospace is no longer about prototyping—it is about industrialization. It is the “scalpel” of modern manufacturing: precise, efficient, and capable of cutting massive material waste from your production line.
Whether you are looking to consolidate assemblies or reduce the weight of flight-critical components, the technology is mature and ready for certification.
Ready to reduce your program’s buy-to-fly ratio? Speak to our Matrix Technology technical engineering team today. Request a Part Assessment to see if your components are ready for industrialization.
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