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With the use of Curvilinear Variable Stiffness ( CVS ) 3D printing technology , mechanical properties of the manufactured products can be further improved and optimized .
 Stiffness, 3D printing technology, mechanical properties, manufactured products, be
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:
 Stiffness, 3D printing technology, mechanical properties, manufactured products, be