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48-No Formwork, No Binders, No Limits - ImpactBuild

24 December 2025 26:59 Seth Kalkman

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About this episode

Is it possible to build a sustainable future using the very ground beneath our feet? In this episode of Constructive, we sit down with Dr. Lauren Vasey and Kunal, the minds behind the ETH Zurich spin-off impact.build. They are moving beyond traditional 3D printing to a method called "Impact Printing"—a process that shoots excavated earth at high velocities to create structural bonds without the need for cement or chemical additives.

We dive into the technical breakthroughs that allowed them to print a two-meter wall in a single session, the mission to democratize construction through automation, and why saving the world requires a profitable business model.

Key Topics Discussed:

  • What is Impact Printing? How shooting material at high velocity creates bonding without binders like cement.

  • The Problem with Extrusion: Why typical 3D printing struggles with height and how impact printing solves the "green strength" problem.

  • Circular Architecture: Using 100% recyclable materials sourced directly from construction site excavation.

  • High-Payload Robotics: Moving specialized tools from the lab to autonomous gantry machines on-site.

  • The Future of Work: Why automation isn't replacing workers, but rather taking over the "dull, dirty, and dangerous" tasks of the industry.

  • Global Scalability: Scaling micro-factories to regions like India to turn waste soil into luxury resorts.

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