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Pre-blended materials using discontinuous fibers asan additive have been under intense investigation asa suitable alternative to multi-head printers with complex and costly designs .
 concept or principle: materials; material: fibers; material: additive; machine or equipment: printers; engineering feature: designs
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:
 concept or principle: materials; material: fibers; material: additive; machine or equipment: printers; engineering feature: designs