Surface finish of printed concrete

Surface finish in 3D concrete printing is the final condition of an element's visible face, ranging from the ribbed as-printed texture left by the nozzle to surfaces that are troweled, ground, polished, rendered or coated after printing.

Updated

Surface finish in 3D concrete printing is the final condition of an element's visible face, ranging from the ribbed as-printed texture left by the nozzle to surfaces that are troweled, ground, polished, rendered or coated after printing. Unlike cast concrete, whose face reproduces the formwork, a printed face reproduces the extrusion process itself.

In practice

The as-printed finish is the cheapest and the most characteristic, but it is not neutral: the ridges hold dust, direct rainwater along horizontal channels, and make small geometric deviations visible. Smoothing while the material is still plastic, by trowelling or by a following tool, closes the ridges but adds labour and must happen within the open time. Grinding, rendering and coating are all possible after hardening and are the usual route where a flat face is required, for example where joinery or sanitary fittings meet the element. Finish should be decided before printing, because it affects nozzle size, layer height, path direction and the amount of accessible working room around the element.

Related terms

  • Layer lines — the ridge pattern that defines the as-printed look.
  • Nozzle — its shape and size set the bead profile and therefore the texture.

Related

Layer linesLayer lines are the horizontal ridges left on a printed concrete surface by each bead, and they are both a visual signature and a practical concern.NozzleThe nozzle is the shaped outlet at the end of a concrete print head that sets the width, profile and placement of each deposited filament.3D Printing in Interior DesignPrinted concrete in interiors: partitions, reception desks, feature walls, bathroom elements and retail fit-out, with acoustics, weight and finishing.3D Printed Facade ElementsPrinted concrete facade panels, ventilated cladding, decorative screens and shading elements: fixing systems, weathering, tolerances and real constraints.