  The 3D printing technology based on digital light processing (DLP) has
highlighted its powerful manufacturing capabilities for optical components.
However, the printing structure obtained by DLP based down projection printing
is easily adhered to the printing window below, and the printed lens surface
will have a step effect. This article uses DLP 3D printing technology to print
non spherical lenses. During the printing process, a new type of inert liquid
fluoride solution was used as the isolation layer, which can more effectively
and conveniently prevent the printing structure from sticking to the printing
window. At the same time, a vertical lifting immersion method was proposed to
smooth the step effect on the surface of the lens.
