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This paper describes how quantitative design guidelines are compiled for a polymer selective laser sintering ( SLS ) process via a metrology study .
 quantitative, design, polymer, laser sintering, SLS, process, metrology
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:
 quantitative, design, polymer, laser sintering, SLS, process, metrology