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In order to provide a tool to investigate this relation , a semi-analytical thermal model of the SLM process is presented which determines the temperature evolution in a 3D part by way of representing the moving laser spot with a finite number of point heat sources .
 tool, model, SLM, process, temperature, evolution, 3D part, laser, heat sources
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:
 tool, model, SLM, process, temperature, evolution, 3D part, laser, heat sources