Large iron gyroid (1.3 x 1.0 cm). Credit: ALCHEMY EPFL CC BY SA Vat photopolymerization is a type of 3D printing that involves pouring a light-reactive liquid resin into a container and then solidifying specific areas with a laser or ultraviolet light to create a shape. However, because this method only works with light-sensitive polymers, its practical uses are limited. Some researchers have developed techniques to turn these printed polymers into stronger materials like metals and ceramics,