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In this case study , Selective Laser Melting ( SLM ) , a laser-based additive manufacturing process , was utilized to fabricate a compact ( 5.08 cm × 3.81 cm × 1.58 cm ) flat-plate oscillating heat pipe ( FP-OHP ) with innovative design features , including a Ti–6Al–4V casing and a closed-loop , circular mini-channel ( 1.53 mm in diameter ) consisting of four interconnected layers .
 case study, Selective Laser Melting, SLM, laser-based additive manufacturing, fabricate, compact, heat, design, mm, diameter
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:
 case study, Selective Laser Melting, SLM, laser-based additive manufacturing, fabricate, compact, heat, design, mm, diameter