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The results show that based on the proposed systematic hierarchical approach , optimal process parameters can be efficiently established for high-quality SLM parts from metal powders .
 optimal process, be, SLM, metal powders
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:
 optimal process, be, SLM, metal powders