MIT researchers at the HAUS group developed 3D-printed construction-grade floor trusses made from recycled PET pellets, featuring glass-fiber reinforcement and an industrial-scale printer. The team printed four 8-foot trusses that each weighed about 13 pounds and were produced in under 13 minutes, then tested them as plywood-topped floor frames.
The printed elements carried more than 4,000 pounds and exceeded U.S. HUD load-bearing standards, demonstrating parity with traditional framing materials while reducing material mass. The researchers described using recycled pellets and aim to adapt the process to minimally cleaned plastic waste and additional structural pieces. This approach could let manufacturers fabricate lightweight, transportable components near high-waste areas, cutting demand for timber and supporting circular construction trends in affordable housing.
Recycled PET Floor Trusses
MIT HAUS Introduced 3D-Printed Trusses Using PET Pellets
Trend Themes
1. Recycled Plastic Structural Components - Printed structural elements made from recycled PET pellets demonstrate potential to replace timber in load-bearing applications while significantly lowering component mass.
2. Industrial-scale Polymer 3D Printing - High-speed, large-format printers producing four 8-foot trusses in under 13 minutes illustrate scalable fabrication of construction-grade parts with performance parity to traditional materials.
3. Circular Localized Manufacturing - Onsite or near-source production using local plastic waste creates pathways to reduce transportation emissions and decentralize supply chains for modular building components.
Industry Implications
1. Construction and Affordable Housing - Lightweight, printable trusses that meet HUD load standards could enable faster, lower-cost floor systems for mass-produced affordable housing projects.
2. Waste Management and Recycling - Processing minimally cleaned plastic waste into feedstock for structural printing opens opportunities for new recycling-to-value streams beyond packaging recovery.
3. Building Materials Manufacturing - Manufacturers of framing and composite materials could incorporate glass-fiber reinforced recycled polymers to offer competitive, lower-mass alternatives to plywood and lumber.