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2 Experimental benchmarking of 3D-printed lattices In contrast to the previous studies , Beyer and Figueroa tested different unit cell structures experimentally and Harl even determined the performance of optimized lattice structures by comparing them to numerical results .
 concept or principle: Experimental; manufacturing process: 3D-printed; concept or principle: unit cell; concept or principle: performance; engineering feature: lattice structures
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:
 concept or principle: Experimental; manufacturing process: 3D-printed; concept or principle: unit cell; concept or principle: performance; engineering feature: lattice structures