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Support structures are required for most geometry because the powder alone is not sufficient to hold in place the liquid phase created when the laser is scanning the powder .
 engineering feature: Support structures; concept or principle: geometry; material: powder; machanical property: liquid phase; enabling technology: laser; concept or principle: scanning; material: powder
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: Support structures; concept or principle: geometry; material: powder; machanical property: liquid phase; enabling technology: laser; concept or principle: scanning; material: powder