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The spatiotemporal variations of the molten pool and deposit profiles during laser Directed Energy Deposition ( DED ) largely affect the formation of printing defects and the build quality .
 variations, molten pool, profiles, laser Directed Energy Deposition, DED, defects, 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:
 variations, molten pool, profiles, laser Directed Energy Deposition, DED, defects, build