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The study shed light on the improvement of selective laser melting build rates without any decrease in the mechanical properties or any loss of parts density of stainless steel 316L .
 manufacturing process: selective laser melting; process characterization: build rates; concept or principle: mechanical properties; machanical property: density; material: stainless steel
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: 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:
 manufacturing process: selective laser melting; process characterization: build rates; concept or principle: mechanical properties; machanical property: density; material: stainless steel