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The reason for a loss of mechanical strength correlated with the increase in porosity caused by the fiber during the printing process ; however , this increased porosity contributed to a more efficient infiltration post-processing .
 mechanical strength, correlated, porosity, fiber, printing process, porosity, infiltration
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:
 mechanical strength, correlated, porosity, fiber, printing process, porosity, infiltration