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Using a design parametric study , a thick and low-density porous layer is found to reduce residual stress and distortion in the built component .
 design, porous, layer, residual stress, distortion, component
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:
 design, porous, layer, residual stress, distortion, component