Researchers at Hebrew University of Jerusalem have developed a novel way to 3D print glass structures without relying on organic binders or extreme heat. Their method uses a light-activated chemical process to directly convert precursor materials into silica, sidestepping the usual challenges of glass printing, tells Tech Xplore.
Traditional glass 3D printing typically requires a two-step process: a “green” part printed with binders or additives, then high-temperature sintering to burn away the organics and densify the glass. That approach often leads to defects, cracking, or loss of resolution. The new technique replaces the binder stage entirely. Instead, when exposed to light (via standard digital light processing, or DLP, systems), the sol-gel precursor undergoes a photochemical reaction that solidifies silica directly.
This breakthrough has several advantages. First, it reduces energy consumption: after printing, a mild 250°C treatment suffices to finish the material, rather than needing >1,000°C sintering typical of glass processing. Second, it improves structural fidelity and purity by eliminating binder removal steps that often introduce flaws. Third, the method is compatible with existing DLP printers, making it more accessible and scalable.
In demonstrations, the team managed centimeter-scale glass objects with moderate transparency and porous structure. While not yet as dense as conventional glass, this proof-of-concept shows potential for optics, microfluidics, medical devices, and custom lenses or filters. Because the technique avoids harsh thermal cycling and chemical waste, it could accelerate innovation in fields where glass components are critical.
The researchers believe this light-triggered approach brings glass printing into a new era. By making the process cleaner, lower energy, and more versatile, they aim to push glass from traditional craftsmanship into digital fabrication.