Researchers at Chalmers University in Sweden have developed a biodegradable 3D printing material made from baker’s yeast, wood cellulose fibers, seaweed alginate, vegetable glycerol, and water. The goal is to create an alternative to conventional construction and interior materials—such as plastics, plaster, or synthetic textiles—using organic and industrial byproducts.
Each component has a clear purpose. Alginate stabilizes the formulation during printing, cellulose fibers reinforce the structure and increase strength, and glycerol acts as a plasticizer to add flexibility. The baker’s yeast serves as a binder that provides viscosity and helps the ingredients form a cohesive mixture. “Because [yeast] consists of single-celled organisms, we can produce a more homogeneous, predictable material,” explains Malgorzata Zboinska, professor at Chalmers and lead researcher on the project. Together the five ingredients form a printable hydrogel with malleable properties.
Malgorzata Zboinska (left) and Yagmur Bektas (right).
3D Printing with Yeast
The process begins by deactivating the yeast with heat. Once the yeast is inactivated, the researchers mix all ingredients into a homogeneous paste. This paste is loaded into syringes and dispensed using a robotic arm to build the object layer by layer. Printing occurs at room temperature, and printed pieces are left to dry until they reach their final shape. “3D printing makes it possible to create complex shapes without producing waste. We can design and manufacture the material directly—with a high degree of control over its shape, texture and material distribution,” says Yagmur Bektas, a PhD student at Chalmers and co-author of the study.
Small changes to the recipe allow the team to tune the material’s properties. Transparency, surface texture, and color vary with composition. In its natural state the material displays tones from yellow to brown, but natural pigments or specialized yeast strains that produce color can be introduced. The researchers also demonstrate that patterns and gradients of opacity can be designed into printed parts, enabling control over how light passes through the material.
Potential Applications for a Yeast-Based Material
The Chalmers team envisions applications primarily in interior design where conventional materials are commonly used—examples include partition panels, solar control louvers, and wall coverings. Beyond interiors, the work points toward broad possibilities in Engineered Living Materials (ELMs). “The future of architectural ELMs is very exciting, with great potential to customise them to perform a variety of functions. This could, for example, involve self-healing materials or materials that purify the air by neutralising harmful substances and pollutants,” Zboinska notes.
Pieces printed with yeast hydrogel. The natural color ranges from yellow to brown tones, depending on the composition of the formula.
The study, published in Frontiers of Architectural Research, is exploratory. The researchers acknowledge that important performance factors still require evaluation, including mechanical strength, behaviour under fire, and moisture response. Scaling production from laboratory samples to larger manufacturing volumes is another challenge the team plans to address.
Designing materials to deliberately degrade after use is central to the project but remains a cultural shift for many industries. “This challenges the traditional notion that materials must last forever, or at least have as long a physical life cycle as possible. Instead, we can think in terms of shorter life cycles and even view the ageing or degradation of the material as part of the design,” the researchers conclude.
*All Photo Credits: Malgorzata Zboinska / Chalmers University of Technology