Researchers at RMIT University in Melbourne have made a biodegradable printing filament from used coffee grounds and printed full-scale architectural forms with it. The "Waste to Form" work is still at research stage, and a demonstrator was shown at Melbourne Design Week. It points to waste-derived materials for low-carbon construction, but no performance data has been published yet.
How was the coffee filament developed?
The work splits between two groups at RMIT. Professor Baohua Jia's team at the Centre for Atomaterials and Nanomanufacturing developed and characterised the filament. Dr Nic Bao's FormX Research Lab studied how its properties can feed into computational design and larger architectural applications. According to the researchers, the coffee grounds raised the material's strength and gave it a brown colour and a faint coffee scent.
What has been shown, and what is still missing?
A full-scale spatial demonstrator was printed from filament made of locally collected grounds. The researchers say the material could help with sound absorption, insulation, scent and appearance, but they have not yet published figures for absorption or insulation. The team is now looking for partners among cafes, material suppliers, designers, manufacturers and construction firms, and uses the process in school outreach on sustainability and additive manufacturing.
How does it compare with earlier food-waste projects?
The EU-funded BARBARA project spent four years and 2.7 million euros developing bio-based filament materials from food and farm residues, and its stated next step was still scaling to semi-industrial level. MANUFACTURA in Mexico printed a wall and a column from an eggshell-based material that hardens without firing. Both show that the path from a working material to industrial construction use is long.
What it means
For construction and product firms, this is a material-science signal rather than a sourcing option. Without strength, insulation or acoustic data, no business case or qualification route can be assessed, and the BARBARA project shows that scaling takes years and substantial funding. Small and mid-sized companies could take part as waste suppliers or pilot partners, but should not plan production use. Local waste streams may help the sustainability story, yet consistent feedstock quality would need to be proven first.
Frequently asked questions
What is the RMIT filament made of?
It is made from spent coffee grounds collected locally in Melbourne and processed into a biodegradable filament for 3D printing.
Is the material ready for construction use?
No. The work is at research stage, and the team has not yet published quantified data on sound absorption or insulation.
Who is involved in the project?
Professor Baohua Jia's materials team and Dr Nic Bao's FormX Research Lab at RMIT, which are now seeking industry partners.
This summary was written with the help of AI from the linked reports, under the editorial responsibility of Svetozar Kolesar.