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Selective Laser Melting ( SLM ) was used to produce 3D-printed net shape NdFeB ( Neodymium Iron Boron ) permanent magnets that exhibit relatively large internal permanent magnetization structures , without exposure to any external magnetizing field .
 Selective Laser Melting, SLM, 3D-printed, Neodymium, Iron Boron, permanent magnets, exposure
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:
 Selective Laser Melting, SLM, 3D-printed, Neodymium, Iron Boron, permanent magnets, exposure