8050
A mathematical model was derived to predict the diameter of the filaments based on the printer head feed rate and extrusion rate .
 concept or principle: mathematical; concept or principle: diameter; material: filaments; machine or equipment: printer; process parameter: feed; process parameter: extrusion rate
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: mathematical, diameter, filaments, printer, feed, extrusion rate 
Answer:
 concept or principle: mathematical; concept or principle: diameter; material: filaments; machine or equipment: printer; process parameter: feed; process parameter: extrusion rate