7513
Preliminary tests with these polymer formulations indicate that variability due to molecular differences between hard and soft formulations is less than 3 % of the prescribed model dimensions , comparable to existing commercial DLP and SLA resins , with unique advantages of a wide range of elastomer stiffness and seamless fusion for 3D printing of structurally detailed and mechanically heterogeneous composites .
 material: polymer; concept or principle: variability; concept or principle: molecular differences; concept or principle: model dimensions; manufacturing process: DLP; machine or equipment: SLA; material: resins; process parameter: range; machanical property: elastomer stiffness; concept or principle: seamless fusion; manufacturing process: 3D printing; material: heterogeneous composites
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: polymer, variability, molecular differences, model dimensions, DLP, SLA, resins, range, elastomer stiffness, seamless fusion, 3D printing, heterogeneous composites 
Answer:
 material: polymer; concept or principle: variability; concept or principle: molecular differences; concept or principle: model dimensions; manufacturing process: DLP; machine or equipment: SLA; material: resins; process parameter: range; machanical property: elastomer stiffness; concept or principle: seamless fusion; manufacturing process: 3D printing; material: heterogeneous composites