5370
Selective laser melting ( SLM ) is a promising manufacturing technique for the production of complex metallic components .
 Selective laser melting, SLM, manufacturing, production, metallic, components
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:
 Selective laser melting, SLM, manufacturing, production, metallic, components