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Next , the same three powder lots were used to 3D-print and post-process a series of testing specimens with different layer thicknesses and build orientations , in order to establish a correlation between the powder characteristics and the geometric and mechanical properties of a final product .
 powder, post-process, testing, layer thicknesses, build orientations, powder, mechanical properties
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:
 powder, post-process, testing, layer thicknesses, build orientations, powder, mechanical properties