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This paper presents a study of CFF FFF parts produced on desktop 3D printers using commercially available filament .
 manufacturing process: FFF; machine or equipment: desktop 3D printers; material: filament
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: FFF, desktop 3D printers, filament 
Answer:
 manufacturing process: FFF; machine or equipment: desktop 3D printers; material: filament