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The incorporation of electrical components into 3D printed products such as sensors or printing of circuits requires the use of 3D printable conductive materials .
 application: electrical; machine or equipment: components; manufacturing process: 3D printed; material: as; concept or principle: 3D; concept or principle: materials
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: electrical, components, 3D printed, as, 3D, materials 
Answer:
 application: electrical; machine or equipment: components; manufacturing process: 3D printed; material: as; concept or principle: 3D; concept or principle: materials