3D scanning assembly, scanning system and 3D printing system

The invention relates to a 3D scanning assembly. The 3D scanning assembly comprises a projection light-emitting module and a vision localization module arranged corresponding to the projection light-emitting module. The projection light-emitting module is used for emitting the projection light onto the surface of a to-be-measured object. The vision localization module is used for acquiring the projection light emitted onto the surface of the to-be-measured object to generate a depth map. The invention also relates to a 3D scanning system and a 3D printing system. The 3D scanning assembly integrates the projection light-emitting module with the vision localization module, so as to realize the extraction and the construction of the horizontal information of the object. Therefore, the scanning-printing cooperativity is improved, and the synchronization effect of scanning and printing is realized.