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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 .
 Fused filament fabrication, FFF, 3D printing, layer-by-layer, deposition, thermoplastic material, nozzle
Please list all entity words in the text that fit the category. Output format is "word1, 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} 
Answer:
 Fused filament fabrication, FFF, 3D printing, layer-by-layer, deposition, thermoplastic material, nozzle