3628
There is growing interest in Laser Powder Bed Fusion ( L-PBF ) or Selective Laser Melting ( SLM ) manufacturing of high conductivity metals such as copper and refractory metals .
 Laser Powder Bed Fusion, L-PBF, Selective Laser Melting, SLM, manufacturing, conductivity, as, refractory metals
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:
 Laser Powder Bed Fusion, L-PBF, Selective Laser Melting, SLM, manufacturing, conductivity, as, refractory metals