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By printing and testing 3D models with varying lattice and shell parameters , the optimized shell thickness compared to lattice density and lattice strut thickness was revealed .
 process characterization: testing; application: 3D models; concept or principle: lattice; machine or equipment: shell; concept or principle: parameters; machine or equipment: shell; engineering feature: lattice density; concept or principle: lattice
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:
 process characterization: testing; application: 3D models; concept or principle: lattice; machine or equipment: shell; concept or principle: parameters; machine or equipment: shell; engineering feature: lattice density; concept or principle: lattice