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In laser-foil-printing additive manufacturing , 3D metallic glass structures can be built by laser welding of amorphous foils , layer by layer , upon a crystalline metal substrate .
 manufacturing process: additive manufacturing; concept or principle: 3D; material: glass; material: be; manufacturing process: laser welding; concept or principle: layer by layer; material: metal
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: additive manufacturing; concept or principle: 3D; material: glass; material: be; manufacturing process: laser welding; concept or principle: layer by layer; material: metal