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This paper investigates the development of a novel high temperature polymer composite material by modifying polyetherimide ( PEI ) ULTEM™ 1010 with the addition of functional additives and processing it into filaments for Fused Filament Fabrication ( FFF ) .
 investigates, temperature, polymer composite, material, additives, filaments, Fused Filament Fabrication, FFF
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:
 investigates, temperature, polymer composite, material, additives, filaments, Fused Filament Fabrication, FFF