1918
To avoid the use of supports this study includes a simplified AM fabrication model , implemented as a layerwise filtering procedure into a topology optimization formulation .
 application: supports; manufacturing process: AM; concept or principle: model; material: as; engineering feature: topology optimization
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:
 application: supports; manufacturing process: AM; concept or principle: model; material: as; engineering feature: topology optimization