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Among the high number of factors influencing part quality and mechanical properties , the inter layer time ( ILT ) between iterative melting of volume elements in subsequent layers is almost completely unappreciated in the relevant literature on L-PBF .
 quality, mechanical properties, layer, melting, volume, elements, L-PBF
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:
 quality, mechanical properties, layer, melting, volume, elements, L-PBF