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Due to the relative youth of metallic powder bed additive manufacturing technologies and difficulties with monitoring the process in situ , there is little consensus in the user community on how to optimize user variable parameters to ensure the highest quality and most cost effective build .
 metallic powder, bed, additive manufacturing, process, in situ, parameters, quality, build
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:
 metallic powder, bed, additive manufacturing, process, in situ, parameters, quality, build