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In this work , the effects of fused filament fabrication ( FFF ) routine parameters on printed PVDF film properties were investigated using a variety of experimental methods .
 manufacturing process: fused filament fabrication; manufacturing process: FFF; concept or principle: parameters; concept or principle: properties; concept or principle: experimental
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: fused filament fabrication, FFF, parameters, properties, experimental 
Answer:
 manufacturing process: fused filament fabrication; manufacturing process: FFF; concept or principle: parameters; concept or principle: properties; concept or principle: experimental