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Herein we overcome these problems and improve Young ’ s modulus , tensile strength and surface quality of 3D printed HDPE by varying 3D printing parameters like temperature and diameter of the nozzle , extrusion rate , build plate temperature , and build plate material .
 s, tensile strength, surface quality, 3D printed, 3D printing, temperature, diameter, nozzle, extrusion rate, build plate, build plate material
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:
 s, tensile strength, surface quality, 3D printed, 3D printing, temperature, diameter, nozzle, extrusion rate, build plate, build plate material