Japanese Startup Serendix 3D Prints Blast Shelters for Defense Use

Serendix, a Japanese construction 3D printing company based in Nishinomiya, has completed high-speed projectile impact tests on 3D-printed concrete structures and will present the results at Farnborough International Airshow 2026. The company is showing blast-resistant shelters and drone base structures through Japan's Acquisition, Technology and Logistics Agency (ATLA) booth.

What the tests measured

The test program fired high-speed projectiles at reinforced concrete frames produced by Serendix's large-format 3D printing process. The company varied structural geometry, wall thickness, and concrete mix formulations to measure how each configuration responded to impact. The goal was not just to prove that 3D printed concrete can stop a projectile, but to generate data that maps specific geometries and material treatments to quantifiable blast resistance levels.

That data set matters because regulatory approval for protective structures depends on repeatable performance evidence, not theoretical strength. Serendix is positioning the Farnborough debut as a step toward qualifying its printed shelters for real defense procurement.

Why 3D printing for shelters

Conventional blast shelters are cast in steel-reinforced concrete using formwork. The formwork process is labor-intensive, requires skilled crews on site, and limits the shapes that can be produced economically. Serendix's approach deposits concrete through a robotic gantry system, building walls layer by layer without molds. Curved surfaces, variable wall thickness, and integrated structural ribs are all achievable without custom tooling.

The company argues that design freedom also produces structural benefits. Load paths in a 3D printed wall can follow the stress distribution rather than the constraints of rectangular formwork. In a blast scenario, that efficiency could allow thinner walls with the same protection level, reducing material weight and transport burden.

From houses to bunkers

Serendix built its reputation on 3D printed homes. The company completed Japan's first 3D printed train station shelter in 2025 and has a pipeline of residential and commercial construction projects. The blast shelter work extends the same robotic concrete deposition hardware into a more demanding application, and the knowledge transfer runs in both directions. Impact test data from the shelter program feeds back into improvements for residential structures.

The Farnborough showing is through ATLA's booth rather than a standalone Serendix exhibition space. That arrangement reflects the company's strategy of partnering directly with government agencies rather than selling through commercial defense primes. It also signals that ATLA sees enough potential in the technology to give it an official platform at one of the world's largest aerospace and defense trade shows.

Broader context

Japan is not the only country exploring 3D printed protective structures. The U.S. Marine Corps and Army have both funded research into additive construction for forward operating bases, and several European defense ministries are testing printed bunkers for border and airfield security. Serendix's entry into this space adds a commercial operator with real construction credentials to a field that has so far been dominated by research institutions and military engineering units.