2071
For macro channel geometry , down-facing surfaces of the channel may experience stability problems during printing .
 engineering feature: macro channel geometry; concept or principle: surfaces; application: channel; machanical property: stability
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: macro channel geometry; concept or principle: surfaces; application: channel; machanical property: stability