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In common thermoplastic additive manufacturing ( AM ) processes , a solid polymer filament is melted , extruded though a rastering nozzle , welded onto neighboring layers and solidified .
 thermoplastic, additive manufacturing, AM, processes, polymer filament, melted, extruded, nozzle, welded
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:
 thermoplastic, additive manufacturing, AM, processes, polymer filament, melted, extruded, nozzle, welded