980
In one of the interesting and innovative developments , continuous carbon fiber and PLA were mixed in the printing head before depositing into the printing bed , increasing the fiber/matrix adhesion .
 material: continuous carbon fiber; material: PLA; machine or equipment: printing head; machine or equipment: bed; engineering feature: fiber/matrix adhesion
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: continuous carbon fiber; material: PLA; machine or equipment: printing head; machine or equipment: bed; engineering feature: fiber/matrix adhesion