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The authors were able to produce parts with good mechanical properties , with approximately 100 % density , without needing sintering processes or post-processing , which constitutes an advantage .
 concept or principle: mechanical properties; machanical property: density; manufacturing process: sintering; concept or principle: processes; concept or principle: post-processing
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: mechanical properties; machanical property: density; manufacturing process: sintering; concept or principle: processes; concept or principle: post-processing