A solar-powered robot uses sand for 3D printing.

Probably, this is the most eco-friendly robot - it carries out 3D printing from natural materials (soil and sand), using natural energy (the Sun).

Despite the fact that the creation of large structures and buildings is still beyond the control of the robot, its creators managed to print a number of sculptures (chairs, columns and arc supporting structures) of sand, earth and a special solidifying mixture.
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Under the cut - video and FAQ.

FAQ from the project site

1. What is the Stone Spray Project?

This is a revolutionary construction method that uses soil and a liquid binder as its material and technical base. For the application of a mixture of nozzles used.

2. And who created the project?

The creators of the project are Peter Novikov, Inder Shergill and Anna Kulik. The project was created at the Institute for Perspective Architecture, Catalonia, under the direction of Martha Mal-Alemany, Jordi Portella and Miguel Leoveras. Professional Consultants - Santigo Martin, Guillaume Camprodon.

3. What are the goals of your project?

First of all, this is a research project. We want to slightly push the development of this industry.

4. How does it work?

The robot mixes the soil with the fixing component, and then prints an object using nozzles.

5. It turned out to print something serious?

Yes! Already have the ability to print some large-scale architectural projects.

6. Is it really so environmentally friendly?

Yes. The robot requires very little energy to work. It can only use solar energy, without external power sources.
Well, all the components of the fixative are made up of LEED certified components.