1772
Although AM used to be called Rapid Prototyping , one is now quite accustomed to having prototypes built quickly , but this is difficult to scale up .
 manufacturing process: AM; material: be; enabling technology: Rapid Prototyping; concept or principle: prototypes
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:
 manufacturing process: AM; material: be; enabling technology: Rapid Prototyping; concept or principle: prototypes