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Understanding the role of processing conditions , specifically extruder velocity and extruder temperature , on the overall strength of the weld will allow optimization of PE-AM parts .
 extruder, extruder, strength, weld, optimization, PE-AM
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:
 extruder, extruder, strength, weld, optimization, PE-AM