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For lattice structures , the geometrical characteristics of unit cells , the building direction , overhang angles , hatch and contour scanning strategy may all influence the obtained roughness in the scaffolds and may cause deviations from designed sizes .
 engineering feature: lattice structures; concept or principle: unit cells; process parameter: building direction; process parameter: overhang angles; process parameter: contour scanning; machanical property: roughness; engineering feature: scaffolds; engineering feature: designed
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:
 engineering feature: lattice structures; concept or principle: unit cells; process parameter: building direction; process parameter: overhang angles; process parameter: contour scanning; machanical property: roughness; engineering feature: scaffolds; engineering feature: designed