MIT Spinout 3D Prints Building Trusses From Recycled Plastic

From Water Bottles to Bridge Trusses

Atlas Building Composites, an MIT HAUS spinout, has commercialized a waterless recycling process that turns single-use plastic into 3D-printed structural trusses strong enough to replace wood or steel in building construction.

The company emerged from MIT's Home Architecture for Universal Sustainability (HAUS) lab, founded by A.J. Perez, who earned his PhD there in 2023, and Matt Pouliot, a former Maine senator. Their core process is deceptively simple: shred plastic waste, melt and fuse it with American-made fiberglass, then extrude the composite through a large-format 3D printer.

No water-intensive washing or pelletizing steps. No waiting for conventional recycling streams.

The Army Corps Bridge Is the Proof

Claims about strength are one thing. Field deployment is another. Atlas recently supplied the U.S. Army Corps of Engineers with composite trusses for a 40-foot bridge in a Massachusetts wetland. The structure went in in under a day.

Wetland sites are unforgiving. Poor access, sensitive ecosystems, moisture exposure that rots untreated wood. Handing that job to a federal engineering agency signals the trusses have cleared scrutiny beyond marketing copy.

According to MIT News and Tech Xplore, Atlas's printed trusses come off the machine in under 13 minutes and support more than 4,000 pounds. That exceeds building code standards for the application.

Scaling the Factory Stack

Atlas's commercial hardware, branded the Atlas Factory Stack, runs at 150 to 200 pounds of composite per hour. That is double to triple the 60 to 80 pounds per hour the team achieved on MIT lab-scale rigs.

The founders envision a network of local factory cells, each producing structural framing for about one small home per day. The long-term goal is to help build 1 billion homes using waste plastic instead of lumber or steel.

What It Means for Makers

This is industrial-scale large-format printing, not something you replicate on a Prusa or Bambu. But Atlas's results are a useful data point for anyone thinking about recycled and composite filaments. The project proves that waste-plastic-plus-fiberglass composites can hit structural performance numbers that matter when the process and print parameters are dialed in at scale.

It also challenges the assumption that recycled material means lower performance. With the right fiber reinforcement and process control, waste-stream plastic can outperform traditional building materials on a direct strength comparison.

The wetland bridge is standing. It is holding weight on plastic that used to be a water bottle.