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In this paper , a hybrid-AM system , combining low-cost fused filament fabrication ( FFF ) and direct ink writing ( DIW ) techniques , has been designed to fabricate supercapacitors ( electro-chemical double layer capacitors , EDLCs ) in a single , automated operation .
 fused filament fabrication, FFF, ink, DIW, designed, fabricate, layer, capacitors
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, ink, DIW, designed, fabricate, layer, capacitors