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By using filaments comprising metal or ceramic powders and polymer binders , solid metal and ceramic parts can be created by combining low-cost fused filament fabrication ( FFF ) with debinding and sintering .
 filaments, metal, ceramic powders, polymer binders, metal, ceramic, be, fused filament fabrication, FFF, debinding, sintering
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:
 filaments, metal, ceramic powders, polymer binders, metal, ceramic, be, fused filament fabrication, FFF, debinding, sintering