I Have Often Heard Of 3D,

printing machines, 

 using wax, plastic, even metal, for the finished product,

 but this is the first time I have heard of them using concrete, 

 Berlin-based designers Studio 7.5 collaborated with Parisian 3D printing experts XtreeE to create a series of continuously printed concrete benches with a woven pattern, the three outdoor benches were printed using XtreeE's technology and equipment, which includes a six-axis 3D-printing robot that can print concrete and clay with extreme precision, Studio 7.5 had worked with other 3D-printed materials on previous projects, but they had never worked with concrete – whereas XtreeE have worked extensively with the material,

 the concrete is printing in alternate layers by the robot head, moving in an continuous oscillating wave and slowly building up the layers, this movement creates the woven pattern,

 by 3D printing the concrete the designers were able to create patterns that would be very expensive and challenging to create using only a mould. The benches are constructed using a minimal amount of concrete in comparison to the amount required with mould forms this reduces the carbon emissions created during the concrete production, 

 the bench is also much lighter than it could have been in solid concrete, and the pattern plays an important role in the aesthetic of the bench, concrete 3D furniture, whatever next concrete 3D printed homes?

oh wait a second, 3D concrete printed homes are on their way! Eindhoven University of Technology has announced plans to 3D print a series of concrete houses that will be made available to rent, in what is being described as a world first, the Dutch university is set to build five 3D-printed houses over the next five years, which will all become rental properties, "The project is the world's first commercial housing project based on 3D-concrete printing," said the university. "The houses will all be occupied, they will meet all modern comfort requirements, and they will be purchased and let out by a real estate company." local studio Houben & Van Mierlo Architecten is leading the design for the project, known as Project Milestone.