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Results show that the scanning speed has a significant effect on the macroscopic defects , such as cracks and pores , microstructure characteristics , such as grain morphology and size , and mechanical properties , such as flexural strength .
 scanning speed, macroscopic defects, as, pores, microstructure, as, morphology, mechanical properties, as, strength
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:
 scanning speed, macroscopic defects, as, pores, microstructure, as, morphology, mechanical properties, as, strength