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In contrast , a stable strain hardening rate was maintained in the vertical build , which led to higher ductility than the horizontal build .
 strain hardening, vertical, build, led, ductility, build
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:
 strain hardening, vertical, build, led, ductility, build