2094
Printing of free standing walls and pilars is also a limiting factor as both the achievable minimal cross sectional area and maximal aspect ratio are limited .
 material: as; process parameter: area; engineering feature: aspect ratio
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:
 material: as; process parameter: area; engineering feature: aspect ratio