The first 3D printing process, known as stereolithography (SLA), was invented by Charles Hull in 1984 when he used ultraviolet lasers to solidify layers of photopolymer resin. This invention ...

If you’ve printed with photopolymer resins ... mix a solution of alum and distilled water and then stir the alcohol, resin, and solution together, rapidly at first and then more slowly.

Current stereolithography printers make use of UV laser scanned over the bottom of a vat of UV-sensitive liquid photopolymer resin, which is chemically tweaked to make it sensitive to the UV ...