On July 1, a Florida startup called Ampera pulled the wraps off something that sounds like science fiction: the first full-scale 3D printed nuclear reactor module. The core and pressure vessel were unveiled at the company's innovation center in Palm Beach Gardens in front of more than 100 local officials, business leaders, and employees. The star of the show is a spherical core printed in silicon carbide, shaped as a gyroid, and designed to run for up to 30 years without refueling. Even if you never plan to touch anything nuclear, this story is worth five minutes, because the reasons Ampera printed this part instead of machining it are the same reasons our customers bring us their hardest parts every week.
What Ampera actually built
Ampera is developing subcritical, thorium-based microreactors built around a proprietary TRISO fuel platform and neutron-source technology. The module unveiled this month includes the pressure vessel and what the company calls a spherical monolithic gyroid core, 3D printed in silicon carbide, a ceramic prized for extreme thermal stability. The systems are expected to deliver up to 30 MWe, with larger configurations planned, and are aimed at the markets Ampera's CEO says need power most: AI data centers, defense, industrial, and maritime.
The safety story is baked into the geometry and the physics. A subcritical core cannot sustain a chain reaction on its own. Remove the neutron source and the reaction stops, which reduces reliance on active safety systems and operator intervention. Ampera has been moving fast on the business side too: it submitted a pre-application letter to the US Nuclear Regulatory Commission in February, partnered with shipping company Scorpio Tankers in April to develop maritime microreactors, and set up an Australian subsidiary in June to secure thorium supply.
I have a part with internal channels no machine shop can touch. Can 3D printing actually make it?
Yes. Parts with complex internal channels, lattices, and gyroid-style geometry are exactly what 3D printing produces routinely and machining physically cannot, because no cutting tool can reach inside a sealed, winding network of passages. A gyroid is a continuous, curving surface that splits a volume into two interlocking networks of channels. It packs enormous surface area into a small space, which is why Ampera chose it for heat transfer inside a reactor core, and why slicers use gyroid infill to make everyday printed parts stiff and light. A printer builds the geometry layer by layer, so internal complexity is essentially free. If you have a housing, manifold, heat exchanger concept, or a discontinued part with internal features you cannot machine, that is our home turf. We can even work backwards from a physical object: our 3D scanning and reverse engineering service turns an existing part into a printable CAD model.
I need a part that survives serious heat, but machined metal is over budget. What are my options?
High-performance polymers like PEEK, ULTEM, and PPSU handle continuous service temperatures roughly in the 150 to 250 C range, and for most industrial applications that is plenty, at a fraction of the cost of machined metal. Ampera needed silicon carbide because a reactor core sees conditions almost nothing else on Earth does. Your under-hood bracket, sterilization tray, or electrical housing does not. That is where engineering thermoplastics shine: chemical resistance, flame ratings, and real mechanical strength, printed as one-off parts with no minimums. See our PEEK and ULTEM 3D printing service for what these materials can take.
Why this matters for makers and engineering buyers
The headline is not that nuclear is going additive. It is that additive keeps graduating into applications where failure is not an option. First it was jigs and prototypes, then flight hardware, then medical implants, and now a printed ceramic core intended to sit inside a pressure vessel for 30 years. Every one of those steps makes it easier to answer the question we hear most from engineering buyers: can I trust a printed part in production? Increasingly, the industry's answer is yes, when the material and process match the job.
We are a US shop in Rockville, MD, and complex one-off parts are our daily bread. If you have a project that needs unusual geometry, high-temp materials, or a replacement part nobody stocks anymore, email us at info@dcadditivepros.com and we will tell you straight whether printing is the right call. And if your company makes 3D printing hardware or materials and you would like us to put it through real shop use and review it here on the blog, reach out at the same address.
Frequently asked questions
Can a 3D printer really print parts for a nuclear reactor?
Yes. Ampera completed the first full-scale 3D printed nuclear reactor module in July 2026, printing its spherical gyroid core in silicon carbide, and unveiled it at its Palm Beach Gardens, Florida innovation center.
What is a gyroid and why does it matter for 3D printing?
A gyroid is a continuous curved surface that divides space into two interlocking channel networks. It offers huge surface area and strength for its weight, and it can only be manufactured practically by 3D printing.
Can I get a one-off part with internal channels 3D printed?
Yes. 3D printing builds parts layer by layer, so sealed internal channels, lattices, and other un-machinable features print without special tooling, even in single quantities with no minimum order.
What 3D printing material should I use for high heat?
For most high-heat applications, PEEK, ULTEM, or PPSU are the right choice, handling continuous temperatures roughly between 150 and 250 C with strong chemical and flame resistance. Extreme cases move up to ceramics like silicon carbide.