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Fused filament fabrication ( FFF ) is a 3D printing technique which allows layer-by-layer build-up of a part by the deposition of thermoplastic material through a nozzle .
 manufacturing process: Fused filament fabrication; manufacturing process: FFF; manufacturing process: 3D printing; concept or principle: layer-by-layer; concept or principle: deposition; material: thermoplastic material; 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: Fused filament fabrication, FFF, 3D printing, layer-by-layer, deposition, thermoplastic material, nozzle 
Answer:
 manufacturing process: Fused filament fabrication; manufacturing process: FFF; manufacturing process: 3D printing; concept or principle: layer-by-layer; concept or principle: deposition; material: thermoplastic material; machine or equipment: nozzle