5791
In this study we performed an extensive parameter development investigation to better understand the effect of laser parameters on surface roughness , density , and porosity of SLM Inconel 718 parts .
 parameter, laser, surface roughness, density, porosity, SLM, Inconel 718
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:
 parameter, laser, surface roughness, density, porosity, SLM, Inconel 718