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The fused-filament fabrication method involves melting a thermoplastic , followed by layer-by-layer extrusion of the molten viscoelastic material to fabricate a three-dimensional object .
 manufacturing process: fused-filament fabrication; manufacturing process: melting; material: thermoplastic; concept or principle: layer-by-layer; manufacturing process: extrusion; machanical property: viscoelastic; material: material; manufacturing process: fabricate; concept or principle: three-dimensional
Please list all entity words in the text that fit the category.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} 
Answer:
 manufacturing process: fused-filament fabrication; manufacturing process: melting; material: thermoplastic; concept or principle: layer-by-layer; manufacturing process: extrusion; machanical property: viscoelastic; material: material; manufacturing process: fabricate; concept or principle: three-dimensional