Entities of a Part: The model when sliced is divided into different functional structures or "Entities", and each these entities’ print setting can be adjusted individually.
Perimeter: The wall/shell of the model. The outter most layer is the “Outter Perimeter”, all the perimeter inside the Outter perimeter are “Inner Perimeters”
Infill: the region inside the perimeter, can be filled with certain patterns and density
Top/Bottom: The roof and bottom layers of the print
Support: Automatically generated structure that support the overhang structures
Raft: Thick layers that are under the print to improve adhesion and also compensate for unevenness of platform surface.
Entity IDs: different entity can be represented with a ID number, these IDs then could be assigned to an extruder, so that the entity will be printed by a specific extruder. Please refer to Extruder Options for more info on this topic.