Abstract: A system is configured to form a three dimensional (3D) object having multiple zones within the three dimensional object. The zones differ from each other according to system operational parameters. The system is operable to perform a method including: (1) receiving a solid model file, (2) generating a shell of the 3D object based on the file, (3) dividing the shell into zones, (4) defining or selecting parameters for forming the zones, (5) forming layer data defining layers of the 3D object, and creating a tool path from the layer data including merging layer data for the zones.