With the SPI process (Selective Paste Intrusion), the Progress Group is introducing a new additive manufacturing process for the prefabrication of concrete elements that is specifically geared towards the requirements of the construction industry. Individual components, including customer-specific components and functional prototypes, are produced daily at the company’s own 3D printing center in Brixen, South Tyrol. The focus here is on the large-format SPI printer, whose working area measuring 4 × 2.5 × 1 meters enables a wide range of construction applications.
Technologically, the SPI process differs significantly from classic 3D concrete printing methods, which are usually used on the construction site. Instead, the elements are industrially pre-produced in the factory. The layer resolution is three millimetres, which allows for a fine level of detail and high dimensional stability at the same time. The selective application of high-viscosity material means that concrete is only placed where it is required for structural or design reasons. This not only reduces material consumption, but also increases geometric flexibility.
According to the Progress Group, the process is not intended as a replacement for conventional production methods, but rather as a targeted extension of them. SPI printing is particularly economical for small quantities, complex geometries or when conventional formwork is not required. Realized application examples range from façade elements to special components for architecturally sophisticated projects.
In contrast to familiar approaches, where 3D printing is used directly on the construction site, the Progress Group deliberately relies on factory production. The advantages include consistent quality, weather-independent production and a controllable working environment. The SPI process is therefore positioned as a pragmatic approach to integrating additive manufacturing into precast concrete production.
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