Geopolymer binder jetting

We engineer stone dust into shapes stone has never taken.

Local mineral sand - quarry fines, brick, demolition concrete - bound by a cement-free geopolymer into load-bearing, weather-resistant stone. 3D Printed, not carved or cast.

Start a project →How it works

Funicular Floor, Zurich 2024 - Odaglia, Ranaudo (BRG)
Anti-Ruin, Venice 2025 - Odaglia, OZRUH

  • 0%cement
  • 80%recycled mineral aggregate
  • 37 MPamean compressive strength
  • 0strength loss after freeze–thaw
  • 5+waste streams printed

Strength and freeze–thaw results: independent testing by a UKAS-accredited laboratory, 2026. Recycled share by mass of the dry mix.

Process

From powder bed to building element

Each element is printed to its final shape. Size comes from assembly, not from the machine.

  1. 01

    Design

    Your model is split into printable elements, with joints, ducts and fixings built in.

  2. 02

    Print

    A layer of stone dust is spread; a liquid activator is jetted only where the part is. Layer by layer, the element forms inside the powder.

  3. 03

    Cure

    The geopolymer hardens at room temperature. No kiln, no autoclave, no cement.

  4. 04

    Depowder

    The element is lifted out. Unbound powder goes back into the next print.

  5. 05

    Finish

    Bearing faces and joints are milled to tolerance; the printed surface stays where it's wanted.

  6. 06

    Assemble

    Elements are dry-stacked and post-tensioned. No mortar: structures can be taken apart and rebuilt.

Printer powder bed with the pattern of printed parts visible in the top layer
Print bed, 1 × 0.7 × 0.6 m build volume.
A printed beam lifted onto a printed column by crane
Printed elements assembled into a post-tensioned portal. Anti-Ruin, Venice 2025.

Materials

The sand sets the character

We print with the mineral residue closest to your project: quarry fines, cutting sludge, crushed brick, demolition concrete. Each feedstock brings its own colour and grain. Up to 80% of the mix is material that would otherwise be landfilled.

Three printed stone cubes in different feedstocks — white, banded and warm brown — on a wooden table at sunset
Three feedstocks, one process. Left to right: marble, marble and sandstone, sandstone.

Applications

Façade. Structure. Object.

Relief panels laid out with a continuous surfaceSee projects

Façade & cladding

Relief panels whose surface runs continuously across joints: patterns, topographies, self-shading geometry. No moulds, so every panel in a façade can be different.

Printed stone columns with visitors for scaleSee projects

Structural assemblies

Printed elements for load-bearing assemblies: columns, beams, and components for partner structural systems. Dry-stacked, post-tensioned, demountable.

A printed shell sculpture housing a speakerSee projects

Objects & acoustics

Furniture, sculpture and acoustic bodies: hollow, ribbed and porous forms no chisel can reach.

Built work

Tested in public, not only in the lab

All projects →
Two printed stone columns carrying a printed beam inside a brick hall with arched windows

Anti-Ruin

Venice, Biennale Architettura · 2025
Faceted printed stone monument on the paving in front of the cathedral entrance

From Thames to Eternity

London, St Paul's Cathedral · 2026
Four printed relief panels laid together, with a hand for scale

StoneX

New Delhi, India · 2026
  • Venice Biennale
  • Royal Academy of Arts
  • St Paul’s Cathedral
  • Paleis Het Loo
  • Stavros Niarchos Foundation
  • Marmomac

Backing

AIO, transportable production setup

Machine, control software and binder, developed together at ETH Zürich since 2018. The printer runs in a 20 ft container, deployed outdoors at Switzerland Innovation Park Zürich, summer and winter.

  • ETH ZürichDeveloped at the Chair of Digital Building Technologies
  • Switzerland Innovation Park ZürichProduction site and space to expand
  • BRIDGE Proof of ConceptSwiss National Science Foundation & Innosuisse
  • EIC PathfinderEuropean Innovation Council, 2026
The printer inside an open 20 ft container
The container unit with its tent, deployed outdoors in summer
The container unit in the snow
Printing unit at Switzerland Innovation Park Zürich, 2025-26.

Bring us a drawing, and a bag of your sand.

Tell us about the project. We reply within a few working days.

Start a project →