3D Printing in Construction: A Case Study of Efficiency and Scalability

Problem: Traditional Construction Challenges in Portugal

In Portugal, public works projects are notorious for exceeding budgets and timelines. The conventional construction process, with its reliance on labor-intensive methods and custom formwork for complex geometries, often leads to delays and cost overruns. The Matosinhos municipality faced this challenge when planning a new recycling center at the Ecocentro de Perafita in Porto.

Solution: 3D Printing with the COBOD BOD2

Havelar, a Portuguese construction firm, opted for an innovative approach using the COBOD BOD2 3D printer. The project involved:

- **Construction Time**: The 500 m² office was completed in just nine working days by a four-person crew. - **Cost Management**: The project was completed on budget, a rarity for public works in Portugal. - **Design Flexibility**: The printer's ability to create curved concrete walls directly from a digital model eliminated the need for expensive custom formwork and reduced labor and material costs.

"With 3D construction printing, trades can work in parallel; there is no waiting for walls or slabs to dry before the electrician, tiler, or carpenter comes in," said Bárbara Rangel, Researcher at the Faculty of Engineering of the University of Porto. "The curved walls also serve a structural purpose and enhance solar gains through the interplay between shade and sun exposure."

Results: Efficiency and Scalability

The Matosinhos project demonstrated the potential of 3D printing in construction:

- **Time Savings**: The project was completed in a third of the time compared to traditional methods. - **Material and Labor Reduction**: The process used a third of the materials and labor, showcasing significant efficiency gains. - **Structural Benefits**: The curved walls not only provided design flexibility but also contributed to the building's structural integrity and energy efficiency.

Havelar's success with the recycling center has spurred further projects. The firm has since printed 32 housing units in Porto and plans to complete 53 additional homes by 2026. This shift from proof-of-concept to operational scale indicates a maturing industry.

European Momentum

The trend is not limited to Portugal. In France, the ViliaSprint² project, a collaboration between PERI 3D Construction, COBOD, Holcim, and Plurial Novilia, delivered 12 apartments across three floors, covering around 800 m² of livable space. The project was completed in 34 days, surpassing the original 50-day estimate, and achieved approximately 60% energy self-sufficiency through integrated perlite insulation, timber balconies, photovoltaic panels, and a hybrid heating system.

In Denmark, the Skovsporet development in Holstebro produced 36 student apartments across six buildings, with a total printed area of 1,654 m². The COBOD BOD3 printer, designed for high-volume, low-rise construction, allowed for sequential production without repositioning, demonstrating scalability and efficiency.

"Construction 3D printing isn’t an alternative method anymore. For projects like this, it’s clearly the superior option," stated Philip Lund-Nielsen, Co-founder and CCO of COBOD International.

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