SpaceX Prints The Part.
Tesla Prints The Mold.
Two of the world's most disruptive companies lean heavily on 3D printing — yet they use it in almost opposite ways. One grows finished rocket engines in metal. The other prints the throwaway sand molds that cast a car. Here's the full story, and why the same logic works in a San Diego workshop.
Elon Musk's two flagship companies are both famous for tearing up the manufacturing rulebook — and both rely on additive manufacturing to do it. But if you assume they use 3D printing the same way, you'd be wrong. The contrast between them is the most instructive lesson in the entire field.
SpaceX prints the finished, flight-critical part itself — a rocket engine chamber that survives launch. Tesla, for the most part, doesn't print car parts at all. It prints the tooling — the sand molds used to cast metal car structures. One company puts the printed object on the vehicle; the other uses the printed object to make the vehicle. Understanding why each chose its path tells you almost everything about when and how 3D printing actually pays off.
SpaceX: Grow The Engine In Metal
SpaceX's relationship with 3D printing started with a part that absolutely cannot fail: the SuperDraco, the engine behind the launch-escape system on the crewed Dragon spacecraft. If something goes wrong on the pad or during ascent, these thrusters fire to pull the capsule and its crew clear.
The SuperDraco's combustion chamber is fully 3D printed using direct metal laser sintering (DMLS), built from Inconel — a nickel superalloy prized for strength and heat resistance. It was the first fully 3D-printed engine to fly. Printing the chamber instead of machining it cut lead time by roughly an order of magnitude: the path from initial concept to first hot-fire test took just over three months. Each engine produces around 16,000 pounds of thrust and was qualified through repeated starts, long burns, and deliberately extreme propellant conditions.
Why print it rather than machine it? Because additive manufacturing lets engineers do things subtractive methods can't. They can build internal cooling channels directly into a single piece, consolidate what used to be many welded components into one monolithic structure, and remove material everywhere it isn't needed — making parts lighter and eliminating weld seams that are potential leak and failure points.
SpaceX's Raptor engine — the methane-fueled, full-flow staged-combustion powerplant for Starship — pushes this even further. Its latest revision consolidates formerly separate components, internalizing secondary flow paths and cooling. Musk has stated SpaceX runs some of the most advanced metal 3D printing in the world, and reports point to a re-engineered Raptor cutting part count by roughly 30% through laser powder bed fusion and design consolidation.
The Falcon 9's engines use a printed main oxidizer valve as well. The throughline: in aerospace, where every gram costs money to launch and every joint is a risk, the printed object is the product. SpaceX isn't the only one — Relativity Space famously built its Terran 1 rocket with roughly 95% of the vehicle produced via additive manufacturing — but SpaceX showed the world the approach works at flight scale.
Tesla: Print The Tool, Not The Car
Tesla's headline manufacturing innovation is gigacasting — using some of the largest die-casting machines on Earth, the "Giga Press," to cast huge sections of a car's structure as a single piece. A front or rear section that once required hundreds of stamped-and-welded parts becomes one casting. The underbody Tesla has targeted could replace on the order of 400 separate components with a single piece.
But here's the twist: to cast metal, you need a mold — and big, complex molds are brutally expensive. This is exactly where 3D printing enters the Tesla story, not as the part, but as the tooling.
Tesla uses binder jetting to 3D print sand molds and cores. A printer lays down a thin layer of industrial sand, selectively glues it with a liquid binder, and builds the mold layer by layer straight from a digital file. A traditional metal tool for a casting this large can cost up to $1.5 million or more, with every single design tweak adding around $100,000. A printed sand mold can be produced in hours, and engineers can revise the digital file and reprint — collapsing the design-validation cycle from as long as a year to roughly two to three months.
That flexibility unlocks designs that were previously too risky to attempt. By placing 3D printed sand cores inside the molds, Tesla's engineers can cast hollow subframes — structures that cut weight while improving crashworthiness. After casting, the sand is removed, leaving precisely shaped voids behind. It's geometry conventional rigid tooling simply can't deliver affordably.
How important is this tooling? Tesla leaned on a specialist partner, Tooling & Equipment International (TEI), which had worked with it since 2017 and sourced printed sand molds to support the Model 3, Model Y, Cybertruck, and Semi. In a clear signal of the technology's strategic value, General Motors acquired TEI to close the gap on Tesla's casting capability.
Two Philosophies, One Technology
| SpaceX | Tesla | |
|---|---|---|
| What's printed | The final flight part itself | The sand mold that casts the part |
| Process | DMLS / laser powder bed fusion (metal) | Binder jetting (sand) |
| Material | Inconel & other superalloys | Industrial sand (mold), then cast alloy |
| Core payoff | Part consolidation, cooling channels, weight | Cheap, fast, revisable tooling |
| Volume logic | Low volume, ultra-high value parts | Mass volume, printed tool used many times |
| The object on the vehicle | Is the printed object | Is cast metal — the print is discarded |
One company prints what flies.
The other prints what builds.
What Both Approaches Share
Strip away the rockets and the Giga Presses and the same principles drive both companies:
Iterate at the speed of software
Whether it's a rocket chamber or a casting mold, changing a digital file and reprinting beats waiting weeks for new tooling. Both companies turned hardware development into something closer to a software release cycle.
Consolidate parts
Fewer pieces means fewer joints, fewer fasteners, less assembly, and fewer points of failure — true for a monolithic engine and a single-piece casting alike.
Design for the process, not around it
Both design parts that only additive methods make possible: internal cooling channels, hollow cores, organic load paths. The freedom of the process becomes a performance advantage.
Use printing where it fits
The smartest insight is knowing when to print the part (SpaceX) versus when to print the tool (Tesla). The right answer depends entirely on volume, cost, and what the finished object needs to do.
Both modes the giants use are available locally. We print durable end-use parts and the jigs, fixtures, patterns, and prototypes that help you build other things. Tell us what you're working on.
The Same Playbook, Your Scale
You don't need a Giga Press or an Inconel laser system to use these exact ideas. The two SpaceX/Tesla modes map cleanly onto what a local 3D printing service does every day:
Print the part (the SpaceX mode)
Need a finished, functional component? A replacement bracket, an enclosure, a custom mount, a discontinued clip, a product housing? We print it as an end-use part in a material matched to the job — the printed object is the deliverable.
Print the tool (the Tesla mode)
Making something else? We print jigs, fixtures, alignment guides, soft-jaw inserts, vacuum-forming bucks, and casting patterns — the printed object helps you build, machine, mold, or assemble faster and cheaper. This is the unsung half of 3D printing, and often the highest-value one for small businesses and makers.
We run FDM printing (Elegoo Neptune 4 Max) for tough, larger functional parts and tooling, high-resolution resin (Elegoo Saturn 4 Ultra 16K) for fine detail and patterns, and a Revopoint MetroY scanner to reverse-engineer existing parts. Same logic as the giants — rapid iteration, part consolidation, no expensive hard tooling — scaled to a single project.
And because there's no tooling cost, a one-off part or a short run of fixtures costs a fraction of traditional manufacturing — exactly the economics that made these methods attractive to SpaceX and Tesla in the first place.
Based in Carmel Valley, Dreaming3D offers FDM & resin printing on demand, 3D scanning and reverse engineering, custom design, and printer repair. From end-use parts to production tooling — let's build it.
Questions, Answered
SpaceX and Tesla are studies in the same technology pointed at opposite ends of a problem. One grows the part that flies; the other prints the mold that builds the part that drives. The shared lesson — iterate fast, consolidate parts, design for the process, and print where it actually pays — is exactly the thinking we bring to every project here in San Diego. Whether you need the part or the tool to make it, we can help.