• ZT Hengl

A lean approach to Construction Printing Technology

Suppliers of building materials are working on construction printing technologies to protect and boost their sales of premixed material. A small startup from Austria is taking an opposing way - pushing hard to lower the cost of 3d printed items by offering an alternative to premixed printing material.

Fig 1 -3d printed white-concrete logo

Printstones was founded on 2017, and - after 3 years of development - is now in a market-entry phase actively testing the product-market fit with partners. The start-up is focusing on the development of fully-automated 3D printing processes for concrete and other cementitious materials.

Stationary 3D-printers (printing cells) based on industrial robots are offered as complete solutions. The reach of such printing systems can be between one and four meters leading to a maximum building size of around 2 x 5 m depending on the objects shape. Extrusion of the cementitious material happens at around 30 cm per second, whereas the printing volume depends on the selected extrusion diameter and lies at 0,6 kg per minute up to 6 kg per minute.

Fig 2 - concrete 3d printer at work

The usage of such concrete printing system allows the customizable, just-in-time production of various concrete objects. “It doesn't make sense for mass-production - but it does for mass-customization and smaller-quantity product lines” says Dr. Hengl, one of the founders of Printstones, “we offer complete solutions including hardware, software and printing material.” The systems also include fully-automated material mixing and dosing units, which allow easy adjustment of recipes towards local materials. This is a new approach, opposing their competitors high priced ready-mix material solutions which can lead to profitable and flexible production of concrete goods.

Fig 3 - 3d printed paving stones

The current printable product range is still under exploration and includes paving blocks, border stones, concrete plates, molds, facade panels, counters, free-form objects, stairs and furniture for public spaces. New product ideas keep coming in from existing customers and new partners every day.

The young company is also pushing into mobile on-site solutions. “Basically, it is an off-site printing cell mounted onto a tracked vehicle and enhanced with an autonomous navigation technology.” says Dr. Hengl, “In a first on-site test, we were able to print a paving area - by feeding the system with a 3d-model and corresponding environmental data”. The compact design of their first mobile version is a key feature, allowing the vehicle to fit into elevators and through doors opening up potential indoor use of the mobile systems. Furthermore, the use of tracks was chosen over a wheeled platform due to the higher stability and its ability to simply drive-up stairs. Printstones next steps are to further amplify the product range towards reinforced concrete structures.

Fig. 4 - Automated construction of a pavement area designed by award-winning Markus Tanzer-Kargl.


©2020 by ZT Dr. HENGL