How researchers created a giant 3D printer capable of building an entire house in just 24 hours

3D printer that builds a house in 24 hours: Researchers at the University of Southern California developed a giant 3D concrete printer designed to build a 2,500-square-foot house in about 24 hours. Developed by Professor Behrokh Khoshnevis, the technology, known as Contour Crafting, used a computer-controlled gantry and a concrete-extruding nozzle to construct a house layer by layer.

The technology was developed from research into large-scale additive manufacturing, with Khoshnevis beginning work on contour-based extrusion methods in the mid-1990s before adapting the concept for construction by 2000. The system was designed to automate much of the construction process while reducing the time needed to build an entire home.

From research concept to large-scale construction

Contour Crafting emerged from research at the University of Southern California's Viterbi School of Engineering between 2004 and 2005. Led by Khoshnevis, the project focused on using robotic construction to improve building speed, consistency and safety, particularly for disaster recovery.


Professor Behrokh Khoshnevis described the technology as "basically scaling up 3D printing to the scale of building," as quoted by Gadgets360.

Instead of traditional construction methods, the system used a nozzle mounted on a computer-controlled gantry to deposit concrete based on a computer-generated design. The printer created walls layer by layer, first forming the outer sections before filling the hollow interior with supporting material.

The continuous printing process also allowed the system to build curved walls that would otherwise be difficult to construct using traditional concrete-pouring methods.

How Contour Crafting was designed to automate home construction

According to the project website, Contour Crafting had the potential to automatically construct a single house or even a colony of houses, each with a different design, in a single run.

The process was also designed to embed conduits for electrical wiring, plumbing and air-conditioning during construction, reducing the amount of finishing work required after the structure was completed.

Researchers said the technology could be used for emergency, low-income and commercial housing.

How Contour Crafting evolved from USC research to commercial development

Research into Contour Crafting continued to expand after its early demonstrations. In 2008, Caterpillar Inc. supported research into applying robotic fabrication techniques to building construction.

In 2009, students from Singularity University worked with Khoshnevis to launch a commercialisation initiative called ACASA, marking an effort to move the technology beyond university research, as per the company's website.

Around 2010, Contour Crafting gained public recognition for its potential to dramatically increase construction speed and reduce material waste compared with traditional construction.

Between 2010 and 2013, NASA evaluated Contour Crafting and funded studies at USC to explore using local materials to build structures on the Moon and Mars.

In 2017, Contour Crafting Corporation (CC Corp) was established with investment from Doka Ventures to industrialize the technology and bring it to market.

During the 2020s, the company focused on developing deployable gantry-based systems that prioritized transportability, reduced setup time, integrated controls and operational readiness.

Why Contour Crafting could make construction faster and more sustainable

According to the project website, the technology could reduce energy use and emissions by using a rapid-prototype, or 3D-printing, process to fabricate large building components.

Researchers also said the Contour Crafting process offered improved surface finish and significantly faster fabrication than existing construction technologies.

At the time, the project had not been commercialised, although Khoshnevis said the technology offered greater flexibility in architectural design than traditional standards.

Looking beyond Earth

Researchers also explored using Contour Crafting to build habitats on the Moon and Mars.

According to the project website, the technology could become one of the few feasible approaches for constructing buildings on other planets targeted for future human colonisation.

Researchers reportedly said, "Our research also addresses the application of Contour Crafting in building habitats on other planets. Contour Crafting will most probably be one of the very few feasible approaches for building structures on other planets, such as the Moon and Mars, which are being targeted for human colonisation before the end of the new century," as quoted by Gadgets360.