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Recent advances in additive manufacturing facilitated the fabrication of parts with great geometrical complexity and relatively small size , and allowed for the fabrication of topologies that could not have been achieved using traditional fabrication techniques .
 additive manufacturing, fabrication, geometrical complexity, fabrication, topologies, fabrication
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:
 additive manufacturing, fabrication, geometrical complexity, fabrication, topologies, fabrication