To be clear, 3D printing modern gadgets is not at all what the MIT researchers were going for. In fact, they didn't even have semiconductors on their minds when they figured this out.

You certainly couldn’t print anything practical like viewing windows or lenses, leaving “clear” 3D printing as more of a novelty than a practical process.

Researchers have developed a novel approach to three-dimensional (3D) printing they call “CLEAR,” which significantly improves the strength and durability of materials by using a ...

These materials and printing processes enable the use of high-resolution, scalable 3D-printing for complex RF dielectric components such as gradient index (GRIN) lenses or three-dimensional circuits.

In this article, methods to improve 3D printing quality through the use of pressure sensors are discussed and the impact this could have on the industry is elaborated on.