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Finally , a discussion is given on improving quality of WAAM fabricated parts through process selection , feedstock optimization , process monitoring and control and post-process , including proposals for future research directions .
 concept or principle: quality; manufacturing process: WAAM; concept or principle: fabricated; concept or principle: process selection; machine or equipment: feedstock optimization; concept or principle: process monitoring; concept or principle: post-process; concept or principle: research
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:
 concept or principle: quality; manufacturing process: WAAM; concept or principle: fabricated; concept or principle: process selection; machine or equipment: feedstock optimization; concept or principle: process monitoring; concept or principle: post-process; concept or principle: research