Resin 3D printing is a technology in which liquid resin is stored in a container instead of being injected through a nozzle. The major types of resin 3D printing include Stereolithography (SLA), Digital Light Processing, and Liquid Crystal Display (LCD) or Masked Stereolithography (MSLA).

SLA is the original form of 3D printing resin, and it was invented in the 1980s. In SLA, a laser is used to cure the resin, layer by layer. The laser beam is projected onto a build platform, and the light activates the photoinitiators in the resin. This causes the resin to solidify and create the desired 3D shape.

Digital Light Processing (DLP) is similar to SLA, but it uses a projector instead of a laser to cure the resin. DLP is typically faster than SLA because it can cure multiple layers at once.

LCD or MSLA is a newer technology that uses an LCD screen to cure the resin. LCD or MSLA printers are typically less expensive than SLA or DLP printers, and they offer a higher degree of accuracy.

 resin 3D printing is a versatile technology that can be used to create a wide variety of objects. It is commonly used to create prototypes, models, and parts for end-use applications.