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SLM – Selective Laser Melting – the system starts by applying a thin layer of the powder material spread by a roller on the building platform .
 manufacturing process: SLM; manufacturing process: Selective Laser Melting; process parameter: layer; material: powder material; machine or equipment: roller; machine or equipment: building platform
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: 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:
 manufacturing process: SLM; manufacturing process: Selective Laser Melting; process parameter: layer; material: powder material; machine or equipment: roller; machine or equipment: building platform