A new 3D printing technique developed by engineers at MIT could transform how designers across industries create complex, high-precision parts. The innovation uses a light-sensitive resin that forms both durable structures and dissolvable supports in a single print process. Once printing is complete, the supports simply wash away—eliminating waste and enabling on-site recycling of materials. This method offers a more sustainable and efficient way to produce everything from medical devices and automotive components to intricate product prototypes and packaging.

Dual-Curing Resin Responds to Light

The breakthrough centres on a special resin that changes based on the type of light it receives. When exposed to ultraviolet (UV) light, the resin hardens into a strong, durable material. In contrast, visible light turns the same resin into a form that dissolves easily in food-safe solvents, including baby oil.

This dual behaviour allows engineers to print both the final structure and the support elements in one process. After printing, the object simply needs a dip in solution to remove the supports. This replaces the usual manual cutting and filing process, which often generates non-recyclable waste.

A Closed-Loop Material Cycle

The dissolvable support material doesn’t go to waste. Instead, it can be recycled directly into fresh resin for new prints. This closed-loop approach is a major step toward circular 3D printing. It offers a more efficient and eco-friendly alternative to traditional methods.

The MIT team used this technique to print complex parts such as gear trains, lattices, and even detailed personalised items like hearing aids. These results show that the method can support high-precision, customised production at speed.

Faster, Cleaner Design for Multiple Industries

This innovation benefits designers who work with interlocking, multipart assemblies or products with delicate features. It makes 3D printing faster, cleaner, and more resource-efficient. For automotive or medical applications, the ability to rapidly prototype or manufacture with minimal waste is a major advantage. For packaging and consumer products, it opens up new design possibilities without sacrificing sustainability.

Professor John Hart of MIT highlights the potential: “This is an exciting path to resource-efficient and cost-effective polymer 3D printing at scale.”

With its mix of technical innovation and environmental responsibility, this new method marks a meaningful advance in sustainable manufacturing.

Source & photos: MIT News