Casting has owned complex metal shapes for over a century. Additive manufacturing is closing the gap fast — especially for low volumes and exotic alloys.
Investment casting (lost wax) creates parts by pouring molten metal into ceramic molds. It's been the standard for complex aerospace and industrial parts since the 1940s. Metal 3D printing builds them layer by layer from powder. Both produce near-net-shape parts with excellent material properties.
The real difference isn't quality — both methods can meet aerospace specs. It's economics. Casting requires tooling that costs $15k–$80k and takes 12–16 weeks to produce. AM requires zero tooling. That changes the math completely depending on your volume and timeline.
This is the biggest differentiator. Investment casting requires wax injection tooling ($15k–$80k depending on complexity), ceramic shell development, and gating design. That tooling takes 12–16 weeks before you see a single part. AM requires nothing — upload a file, set build parameters, and print. First article in 2–3 weeks.
The break-even point typically falls around 100–150 parts. Below that, AM is almost always cheaper when you factor in tooling amortization. Above that, casting's per-unit cost drops and the tooling investment pays back. But if you need parts before the tooling is even ready, AM is your only realistic option.
First article from casting: 14–20 weeks (tooling + first pour + inspection). First article from AM: 3–5 weeks (build + post-processing + inspection). For production runs after tooling exists, casting narrows the gap — each pour cycle is 2–4 weeks. But that initial timeline difference can make or break a program schedule.
Casting handles complex external geometry well — that's what it was designed for. But internal channels, lattice structures, and enclosed voids are difficult or impossible. Ceramic cores can create some internal passages, but they add cost and failure risk. AM has no such limitations. Internal cooling channels, conformal passages, variable wall thickness — if you can model it, you can print it.
Casting has broader alloy availability overall, especially for aluminum and copper alloys. But for superalloys like Inconel 718, Inconel 625, and Ti-6Al-4V, AM produces equivalent or better material properties with more consistent microstructure. If you're speccing exotic alloys for high-temp applications, AM is often the better path.
Casting makes sense when you need 150+ identical parts with complex external geometry, when your alloy isn't available in powder form, or when you have a stable design that won't change. It's also the right call for very large parts that exceed AM build envelopes (most DMLS machines max out around 400mm).
AM wins when you need parts fast (weeks, not months), when volumes are low (1–100 parts), when the design has internal features casting can't reach, or when you're still iterating. It's also the better path when you need to consolidate a multi-piece cast assembly into a single printed part — fewer joints, fewer failure modes, simpler supply chain.
Many programs start with AM for prototyping and low-rate initial production, then transition to casting once the design is frozen and volumes ramp up. We help customers plan for this from day one — designing parts that work in both processes so the transition is smooth.
Send us your part requirements and we'll recommend the right manufacturing approach — AM, casting, or a phased strategy that uses both.
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