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This is particularly a challenge when printing large-scale parts , such as with the Big Area Additive Manufacturing ( BAAM ) system , because layer times can exceed several minutes .
 as, Area, Additive Manufacturing, layer
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:
 as, Area, Additive Manufacturing, layer