High proportion of recycled material in the printed concrete / Innovative print head from M3DUSA unlocks potential and will drastically reduce construction costs / “Calla” house combines recycled concrete and warm wood

Witzighausen, December 2024: In Witzighausen in the district of Neu-Ulm, a unique single family house has been built in recent weeks using a 3D construction printer and printed with innovative, standard-compliant 3D recycled concrete. For this flagship project, three industry players joined forces: building materials manufacturer Sievert, innovation driver and general contractor Rupp Gebäudedruck and technology specialist M3DUSA AG.

“Together with our partners, we have realized a one-of-a-kind showcase project in Witzighausen, which is as sustainable in every square centimeter, in the building materials, the technologies used and the technology installed as is possible today in 3D construction printing. Fast and high-quality construction, economically and ecologically sensible – that was the wish of the community of owners of the new single family home,” explains Yannick Maciejewski, founder and Managing Director of Rupp Gebäudedruck GmbH and M3DUSA AG, which is realizing the building as general contractor. “We want housing to remain affordable in the future. By using innovative building materials, for example from recycled construction waste, we are reducing costs and doing something for the environment at the same time. In this way, we are establishing house building as a safe, high-quality, fast, affordable and ecological construction method”.

High proportion of recycled material in printing concrete

“Witzighausen is an outstanding residential construction project because it shows how innovative, high-quality and sustainable 3D construction printing can already be today. This is the first time that a standard-compliant, circular ready-mixed dry concrete has been used specifically for 3D extrusion printing. The residential project was made possible thanks to the collaboration with our project partners – together we are working on innovative ideas and solutions for the industry,” comments René Grupp, CEO of Sievert SE, which supplied the printing concrete for the architecturally sophisticated house. “We urgently need more innovation in the construction and real estate industry. To drive this forward, we are conducting intensive research into new building materials that are sustainable, in particular recyclable, and at the same time economical.” The printing concrete used in this project contains a high proportion of secondary raw materials. At the same time, it can be processed easily and precisely.

Innovative print head from M3DUSA unleashes potential and will drastically reduce construction costs

The single family house is printed with the innovative print head from M3DUSA. The versatile 3D print head can work with both conventional concrete in accordance with EN 206 and recycled concrete. “This pioneering technological achievement by our team marks an important turning point in the construction industry. By utilizing the potential of different types of concrete, including lower cost options, the cost of printing with concrete is dramatically reduced,” explains Frank Strietzel, Founder and Senior Vice President of M3DUSA AG. Savings of five to ten times compared to standard printing processes are possible. “Construction must remain affordable and become sustainable: 3D construction printing makes it possible. With this project, we can show that building with a 3D construction printer is a real alternative to conventional construction methods that is also attractively priced in the long term.”

“Calla” house combines recycled concrete and warm wood

The sustainably built home comes from the world’s first catalog for 3D-printed houses “Ready2Print” and comprises a total of 160 square meters of living space on two floors. The house, called “Calla”, consists of two cubes of different heights, one inside the other. The larger, single-storey cube contains an open-plan living area with a kitchen, dining and living area. The second cube is two-storey with a bedroom, study and bathroom. On the first floor there is a large bedroom with dressing room, an open shower and bath area in curved, printed shapes and a separate WC. The upper floor provides access to the 21 square meter roof terrace. Inside, there are doors and windows in a warm wooden look that form a pleasant contrast to the concrete surface of the printed walls.

Whether a single family house or apartment building, villa or tiny house or an individually designed house from the printer: an overview of the models and ideas as well as further information on the printing process can be found at www.rupp-gebäudedruck.de. The house catalog can be ordered at www.rupp-gebaeudedruck.de/hauskatalog.