Software as a Service (SaaS) means the software being used is running on servers which belong to someone else. So a key benefit of SaaS is that a user organization does not have to invest in computers and system administration to be able to use the software.
Many SaaS applications are available through any web browser. They often are priced on a pay-per-use basis. The application is usually run in the cloud, but in all cases the provider takes responsibility for server hardware and software support and maintenance.
Solid Modelling (also 3D solid modelling) is a software technology which allows computer systems to handle data which represents a 3D object. Solid modelling enables software applications to create, manipulate, visualize, and analyze objects which only exist as computer data, including objects with curved surfaces and complex internal structures.
Applications can use data from the real world (such as photos or Lidar scans) to create solid models; and they can translate solid model data into instructions for production machines (including 3D printers) to make physical representations of the models.