The BAM Weber Beamix 3D printer uses 3D geometric designs to make elements that can be combined into structures such as bridges, retaining walls, outlet details, street furniture and even skate ramps. 


The chosen design is printed using a concrete mortar mix, which is driven through a printing nozzle from a concrete pump that is affixed to a robotic arm by a hose. The arm delivers layer upon layer of mortar approximately 5mm thick to build up the 3D element. Between each layer we can include a fine metal wire to increase durability and prevent cracking.

The printer uses a unique mortar mix, which remains fluid until it stops moving. Once laid out it solidifies until the subsequent layer introduces energy and bonds both layers as a fluid. Each layer must be laid within 10 min of each other. This means it is as strong as normal cast in place monolithic elements and has a similar performance without delamination.

The concrete takes 28 days to reach full strength but elements are usually moved within a day from the print bed to allow others to be made.

It is also possible to add different colours and coatings to the mortar to meet project requirements. BAM is continuously improving the finish and looking at new additives to increase tensile strength.

Where can we do 3D printing? 

BAM has a production line in Eindhoven with capacity to deliver large-scale projects in controlled conditions, which ensures a quality product. The factory is taking orders and developing solutions for customers from around the Royal BAM Group. BAM is also developing a flying factory concept, which will enable us to set up the facility closer to projects in the future, allowing us to print off site on any site. This was the prototype displayed at Heathrow and other international events.

What are the benefits of 3D printing?

Less carbon and resources: “Labour shortages and the climate change agenda mean we need to be smarter in the way we construct. Using the 3D concrete printing robot, which never needs to sleep; we can reduce logistics, related emissions and the number of workers we need on site.” Jeroen Nuijten, Innovation Specialist, BAM Infra

Less waste: The printer uses 40% less materials and the failure rate is lower allowing us to optimise the materials used. A controlled process with no formwork means less waste and a lower carbon footprint.  

Is this applicable to my project?

3D printing can be adopted in some form on most project types where a suitable solution/need is identified early. At present it works particularly well in those situations where customers want to print unique structures but in large quantities. However, to be most effective BAM needs to work in partnership with customers and consultants at an early stage to help define these solutions and realise the benefits of this technology.


Find out more about BAM’s 3D printing: