MIT Researchers Develop Reusable Resin 3D Printing Supports That Could Cut Waste by 71%

One of Resin Printing's Biggest Wastes, Solved?

In resin 3D printing, support structures make it possible to produce complex geometries, overhangs, and very thin features that would otherwise collapse during printing. But they also increase material consumption, require manual removal that can leave marks on the part's surface, and are discarded after every single print. A team of researchers at the Massachusetts Institute of Technology (MIT) believes it has found a way to break that cycle.

The Water-Soluble Interface Method

Published in Additive Manufacturing Letters, the MIT study presents a process that allows the same support structures to be reused across multiple prints. Instead of manufacturing and discarding supports with each part, the system keeps them virtually intact thanks to a thin layer of water-soluble, curable resin that acts as a sacrificial separation point between the support and the final part.

How It Works

1. Prefabricated supports are tailored to a specific part and mounted on the print bed using a kinematic coupling system — a high-precision mechanism that ensures they are always positioned in exactly the same place.
2. Automated deposition — a needle controlled by an automated system deposits a small amount of water-soluble, curable resin onto the tip of each support. This is then UV-cured, forming a thin interface between the reusable support and the part.
3. Printing — the platform descends into the resin tank and prints the part using conventional resin, with the support never coming into direct contact with the part.
4. Release — after washing and curing, the assembly is placed in an ultrasonic bath filled with water. The soluble interface breaks down and releases the part with virtually no mechanical force, while the supports remain intact and ready for the next print.

Impressive Material Savings

To verify the system, the team printed four models shaped like a dragonfly wing — a particularly delicate geometry due to its fine structural ribs. After each print, the part was removed by dissolving the support interface in water, and the same supports were reused for the next cycle. The researchers observed no noticeable changes in support behavior or part quality across all four cycles.

The material savings are dramatic. When the team printed the same dragonfly wing on a commercial Formlabs Form 4 with default support settings, 76% of the total resin volume ended up forming supports that were subsequently discarded. With the new method, only the small amount of water-soluble resin used to create the interface is consumed — approximately 5% of the total resin consumption per print cycle. That represents a 71% reduction in material waste for supported prints.

Still Experimental, But Promising

The authors emphasize that the technology is still in an experimental phase. The process requires a photopolymerization printer specifically designed to operate from the top down, equipped with an automated system capable of precisely depositing the soluble resin onto each support structure before printing begins. This means it cannot yet be implemented on most commercial resin printers, which use a bottom-up architecture.

Even so, the study opens an interesting avenue for overcoming one of the main obstacles to automating resin 3D printing. If future research can simplify the process and extend the lifespan of reusable supports, this strategy could significantly reduce material waste and manual intervention — bringing resin-based additive manufacturing closer to more automated production workflows.

The full study is available at Additive Manufacturing Letters (ScienceDirect).