2775
Finally , several 3D components consisting of hybrid stainless steel ( SS 316L ) , copper ( Cu10Sn ) and polymer ( PLA , PET ) were successfully printed and their potential applications were discussed .
 3D, stainless steel, SS, copper, polymer, PLA
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:
 3D, stainless steel, SS, copper, polymer, PLA