1969
3 For irregular geometries from topology optimization and freeform design , it is advisable to perform build-simulation to ensure no local heat accumulation occurs which might lead to residual stress and warping .
 concept or principle: geometries; engineering feature: topology optimization; engineering feature: freeform design; machanical property: heat accumulation; material: lead; machanical property: residual stress; concept or principle: warping
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: geometries; engineering feature: topology optimization; engineering feature: freeform design; machanical property: heat accumulation; material: lead; machanical property: residual stress; concept or principle: warping