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However , due to the different operating conditions of an AM process compared to a welding process , it is of interest to compare the current extruder to that of other alternatives to identify the optimal design .
 manufacturing process: AM process; manufacturing process: welding; concept or principle: process; machine or equipment: extruder; engineering feature: design
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: 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:
 manufacturing process: AM process; manufacturing process: welding; concept or principle: process; machine or equipment: extruder; engineering feature: design