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Popular 3D printing techniques such as fused deposition modelling ( FDM ) and stereolithography ( SLA ) have certain limitations and challenges .
 manufacturing process: 3D printing; material: as; concept or principle: deposition; manufacturing process: FDM; manufacturing process: stereolithography; machine or equipment: SLA
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: 3D printing, as, deposition, FDM, stereolithography, SLA 
Answer:
 manufacturing process: 3D printing; material: as; concept or principle: deposition; manufacturing process: FDM; manufacturing process: stereolithography; machine or equipment: SLA