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One of the major challenges with the powder bed fusion process ( PBF ) and formation of bulk metallic glass ( BMG ) is the development of process parameters for a stable process and a defect-free component .
 powder bed fusion process, PBF, metallic glass, process parameters, process, component
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:
 powder bed fusion process, PBF, metallic glass, process parameters, process, component