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Metal additive manufacturing ( AM ) such as selective laser melting ( SLM ) has the powerful capability to produce very different microstructural features , hence different mechanical properties in metals using the same feedstock material but different values of process parameters .
 manufacturing process: Metal additive manufacturing; manufacturing process: AM; material: as; enabling technology: laser; manufacturing process: SLM; concept or principle: microstructural; concept or principle: mechanical properties; material: metals; material: feedstock material; concept or principle: process parameters
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: Metal additive manufacturing, AM, as, laser, SLM, microstructural, mechanical properties, metals, feedstock material, process parameters 
Answer:
 manufacturing process: Metal additive manufacturing; manufacturing process: AM; material: as; enabling technology: laser; manufacturing process: SLM; concept or principle: microstructural; concept or principle: mechanical properties; material: metals; material: feedstock material; concept or principle: process parameters