Vat polymerization produces solid 3D objects after beams of light shine on photoreactive liquid resins. This 3D-printing method is typically fast and inexpensive.

Your body is mostly empty space. A rock, a tree, a table, all these things are mostly empty space. These objects act as if they were solid all the way through.

As that video explains, solid knitting isn't a world away from 3D printing, as objects are built by layers with material fed through an automated, programmed machine.

Researchers have invented a new solvent-free polymer for digital light printing (DLP), a type of 3D printing that essentially pulls solid objects out of a shallow pool of resin one layer at a time.

Physics advance details new way to control solid objects in liquid. ScienceDaily. Retrieved June 11, 2025 from www.sciencedaily.com / releases / 2025 / 05 / 250521124615.htm.