5111
Hence , to enable reliable FEM simulations for the designing of 3D printed products , better control of the SLS process with regards to porosity , pore morphology and pore distribution is needed .
 FEM, 3D printed, SLS process, porosity, pore, morphology, pore, distribution
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:
 FEM, 3D printed, SLS process, porosity, pore, morphology, pore, distribution