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In theory , the aforementioned equations for short fiber composites , can be used to model 3D printed parts , however , length and orientation of the fibers used in the process should match the assumptions .
 material: short fiber composites; material: be; concept or principle: model; application: 3D printed parts; concept or principle: orientation; material: fibers; concept or principle: process
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:
 material: short fiber composites; material: be; concept or principle: model; application: 3D printed parts; concept or principle: orientation; material: fibers; concept or principle: process