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Powder bed AM leads to lower surface quality than the other AM techniques , due to the presence of large and partially melted powder particles in the printed piecessurfaces .
 machine or equipment: Powder bed; manufacturing process: AM; process parameter: surface quality; manufacturing process: AM techniques; concept or principle: melted; concept or principle: particles
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:
 machine or equipment: Powder bed; manufacturing process: AM; process parameter: surface quality; manufacturing process: AM techniques; concept or principle: melted; concept or principle: particles