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Advances in development of composite 3D printers have not prevented development in pre-blended materials with fillers such as nanoparticles , carbon nanotubes , fibers and graphene in order to achieve unique characteristics and capabilities .
 material: composite; machine or equipment: 3D printers; concept or principle: materials; material: as; material: carbon nanotubes; material: fibers; material: graphene
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: composite; machine or equipment: 3D printers; concept or principle: materials; material: as; material: carbon nanotubes; material: fibers; material: graphene