8504
Here , two new support geometry algorithms are proposed , which are particularly suitable for weak support materials : the shell technique , whereby the primary support material would collapse under its own weight and thus a second support material is used to create a containment shell ; the film technique , whereby a second support material is deposited as a thin film between the part and the primary support material .
 support, geometry algorithms, support materials, shell, support material, weight, support material, shell, support material, as, support material
Please list all entity words in the text that fit the category. Output format is "word1, 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:
 support, geometry algorithms, support materials, shell, support material, weight, support material, shell, support material, as, support material