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This experimental study investigates the combined effect of the three primary Additive Manufacturing ( AM ) build orientations ( 0° , 45° , and 90° ) and an extensive array of heat treatment plans on the plastic anisotropy of maraging steel 300 ( MS1 ) fabricated on the EOSINT M280 Direct Metal Laser Sintering ( DMLS ) system .
 concept or principle: experimental; concept or principle: investigates; manufacturing process: Additive Manufacturing; manufacturing process: AM; process parameter: build orientations; manufacturing process: heat treatment; material: plastic; machanical property: anisotropy; material: maraging steel; concept or principle: fabricated; manufacturing process: Direct Metal Laser Sintering; manufacturing process: DMLS
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: experimental, investigates, Additive Manufacturing, AM, build orientations, heat treatment, plastic, anisotropy, maraging steel, fabricated, Direct Metal Laser Sintering, DMLS 
Answer:
 concept or principle: experimental; concept or principle: investigates; manufacturing process: Additive Manufacturing; manufacturing process: AM; process parameter: build orientations; manufacturing process: heat treatment; material: plastic; machanical property: anisotropy; material: maraging steel; concept or principle: fabricated; manufacturing process: Direct Metal Laser Sintering; manufacturing process: DMLS