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FDM technology is the most popular of desktop 3D printers and the less expensive professional printers .
 manufacturing process: FDM; machine or equipment: desktop 3D printers; machine or equipment: printers
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: FDM, desktop 3D printers, printers 
Answer:
 manufacturing process: FDM; machine or equipment: desktop 3D printers; machine or equipment: printers