3D-printed PCB made with liquid metal and PVA is fully recyclable, allows immediate reuse — dissolves and separates when immersed in water, allowing for reuse

DissolvPCB process.

A team of researchers from the University of Maryland, Georgia Tech, and the University of Notre Dame created a new 3D printing method for building PCBs that can use fully recyclable materials. That means a PCB can be created, dissolved, and the materials entirely reused to create a new PCB.

According to the paper (via ResearchGate), this technique, called DissolvPCB, utilizes polyvinyl alcohol (PVA) as a printing filament to form a substrate with hollow channels, where eutectic gallium-indium (EGaIn) liquid metal is injected.