8561
Increasing void size in printed objects through FFF negatively affects strength Novel method of FFF proposed to reduce the void size Novel method reduces crosB-sectional void surface area by 18.0 % Novel method improves density by 6.5 % per mm increase in nozzle size Novel method improves max .
 concept or principle: void; manufacturing process: FFF; machanical property: strength; manufacturing process: FFF; concept or principle: void; concept or principle: void; process parameter: surface area; machanical property: density; manufacturing process: mm; machine or equipment: nozzle
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
 Entities: void, FFF, strength, FFF, void, void, surface area, density, mm, nozzle 
Answer:
 concept or principle: void; manufacturing process: FFF; machanical property: strength; manufacturing process: FFF; concept or principle: void; concept or principle: void; process parameter: surface area; machanical property: density; manufacturing process: mm; machine or equipment: nozzle