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Despite the ongoing success of metal additive manufacturing and especially the selective laser melting ( SLM ) technology , procesB-related defects , distortions and residual stresses impede its usability for fracture-critical applications .
 metal additive manufacturing, selective laser melting, SLM, technology, defects, residual stresses
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:
 metal additive manufacturing, selective laser melting, SLM, technology, defects, residual stresses