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This paper explores a case study in the use of one of the payload 3D printers to manufacture a device to be used by the crew as part of nominal ISS Operations .
 case study, 3D printers, manufacture, be, as
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:
 case study, 3D printers, manufacture, be, as