Construction Layout Robot: Chalk Lines to ABB

Before a single wall goes up, someone has to mark on the bare concrete where every wall, door, sleeve and anchor will sit. For most of history that meant a chalk line, a tape measure and a lot of crawling around on your knees. A construction layout robot now prints those marks straight from the digital model onto the slab. This post follows the job from snapped strings and surveyors' instruments to the total station, looks at the layout printers working on sites today, and asks where ABB robots fit as more of the building moves into factories that work from the same digital model.

A total station stands beside set-out lines and reinforcement on a building site at sunset. Photo: HR Surveyors / Wikimedia Commons (CC BY 4.0)

How crews snapped lines and pulled tapes

The basic layout tool is very old. A chalk line is a string coated in powdered chalk, pulled tight across a surface and plucked so it leaves a straight mark where it strikes. Chalk lines were used in ancient Egypt and are mentioned in Homer's Iliad, and builders have used them ever since. In East Asia carpenters used an ink line instead, a silk cord drawn through an inkpot, called a sumitsubo in Japan. On a building site, a carpenter would measure off the drawings with a tape, set two points and snap the line between them, wall by wall.

US Air Force Airman 1st Class Ryan Moran snaps a chalk line on a sheet of plywood. Photo: U.S. Navy via Wikimedia Commons (public domain)

Big buildings needed a frame of reference first. Crews set up batter boards, wooden frames just outside the corners of a foundation, and stretched strings between them to fix the building lines and the level. Surveyors set the control points with optical instruments. A theodolite measures horizontal and vertical angles through a telescope, and a level gives a horizontal line of sight, so a surveyor and a helper holding a staff could place points to plan. From those points, the layout crew worked out the rest of the floor with tapes, squares and the old 3, 4, 5 triangle for right angles.

Strings stretched between batter boards mark the lines of a foundation. Photo: Edward27821 / Wikimedia Commons (CC BY-SA 4.0)

Electronics arrived on the surveyor's tripod first. Zeiss showed the Reg Elta 14 at a meeting of German surveyors in Stuttgart in 1968. It combined an electronic theodolite with an electronic distance meter and recorded its readings on punched tape, and it is often called the first total station. Hewlett-Packard introduced the HP 3810A in November 1975, the first instrument sold under the name total station. Later robotic total stations turn and track a prism by motor, so one person can run the instrument from the point being staked. Even then, someone still had to kneel on the slab with a can of paint or a chalk line.

A surveyor sights through a theodolite while a helper kneels at the tripod in Castlecrag, Sydney, 1920. Photo: National Library of Australia via Wikimedia Commons (no known restrictions)

Layout printers on the slab today

Dusty Robotics took on that last step. Tessa Lau and Philipp Herget founded the company in 2018, and its FieldPrinter launched in 2019. The small mobile robot reads the building information model and prints the layout lines and text directly on the floor, with a stated accuracy of 1/16 inch. By January 2024 the first version had printed more than 91 million square feet, and Dusty introduced a smaller FieldPrinter 2 weighing 23 pounds, with a wider print head and the ability to print behind columns and closer to edges. HP sells a rival, SitePrint, which follows a total station and needs a clear line of sight to it.

A Zeiss Rec Elta 3 electronic surveying instrument on display at the Deutsches Museum in Munich. Photo: Tiia Monto / Wikimedia Commons (CC BY-SA 3.0)

On September 12, 2026, CNBC looked at robots and the US housing shortage, put at about 1.2 million homes, and found the gains so far coming from narrow, specialized machines like these. Dusty says one operator can lay out roughly 10,000 to 15,000 square feet a day, up to 10 times faster than doing it by hand. Lau told CNBC she sees standardization as the bigger problem than a lack of workers. Aaron Love of Oh Snap Layout in Southern California pairs layout printing with precut lumber and prefab panels, and says that cut the shell stage from about 21 days to 11 or 12. He still described the industry as "in that prove-it phase."

A total station working on a cleared construction site, its green guide light switched on. Photo: Cvstr / Wikimedia Commons (CC BY 4.0)

ABB does not sell a layout printer, and no source shows its robots doing slab layout. ABB robots work at the other end of the same model, in the factories that build the parts the layout has to fit. House of Design in Nampa, Idaho, uses ABB robots to build trusses and wall panels from 3D models. In 2025 Cosmic Buildings set up a mobile microfactory in Pacific Palisades, California, where ABB IRB 6710 robots build wall panels for homes lost in the wildfires, with the process simulated first in RobotStudio. We covered that in our post on home building microfactories. A panel built to the millimetre only helps if the marks on the slab are just as exact.

An ABB robot building a timber wall panel inside the Cosmic Buildings mobile microfactory. Photo: ABB

Where layout robots go from here

The next step is joining the two ends. If the panels come out of a factory and the slab is printed from the same model, the site crew mostly checks and assembles. Mobile robots are a natural base for that. ABB's Flexley Mover P604 is an autonomous mobile robot that finds its way through a plant with 3D Visual SLAM instead of fixed tracks. ABB sells no such thing, but a print head or a scanner on a vehicle like that could one day mark factory floors or large slabs. Before any of it is tried on a real floor, paths and reach can be checked in RobotStudio.

The ABB Flexley Mover P604, which navigates with 3D Visual SLAM. Photo: ABB

Inside factories, marking is already a robot job in a different form. An arm can mark drilling points, cut lines or installation positions on a wall panel or precast slab while it sits on a table, where the light is good and nothing moves. A GoFa CRB 15000 cobot could do that kind of marking next to people, and ABB has shown engineers checking a GoFa cell with an AR headset before it is built. Large arms already print buildings: an ABB IRB 6700 printed the concrete walls of the German Red Cross headquarters in Warendorf-Beckum, as we described in our post on 3D printed concrete buildings.

Using an AR headset to check a GoFa cell before it is built. Photo: ABB

For homes, layout printing will mostly reach owners indirectly, through builders who rent the machine or buy the service, since a printer costs far more than a chalk line. Smaller jobs like kitchen refits and extensions are the hard case, because setting up still takes time. On site, slabs are dusty and cluttered, rebar and tools get in the way, and a robot that depends on a total station loses its position when someone stands in the beam. The model also has to be right, because a robot prints mistakes as neatly as it prints good lines. So the layout carpenter's job shifts toward checking the model, running the printer and fixing what does not fit.

An ABB IRB 6700 printing the walls of the German Red Cross headquarters in Warendorf-Beckum. Photo: ABB

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