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This paper aims to study the mechanical properties of mixed isotropic carbon fiber 3D printed composites and further investigates the influence of hot press on the [ 0°/45°/90° ] 2 fiber angles composite with varying temperature , pressure and time .
 concept or principle: mechanical properties; material: isotropic carbon fiber; manufacturing process: 3D printed; concept or principle: investigates; machine or equipment: press; material: fiber; material: composite; process parameter: temperature; concept or principle: pressure
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: mechanical properties, isotropic carbon fiber, 3D printed, investigates, press, fiber, composite, temperature, pressure 
Answer:
 concept or principle: mechanical properties; material: isotropic carbon fiber; manufacturing process: 3D printed; concept or principle: investigates; machine or equipment: press; material: fiber; material: composite; process parameter: temperature; concept or principle: pressure