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A fragile and non-thixotropic biocompatible low molecular weight gel is printed in 3D structures by a solvent exchange process .
 fragile, non-thixotropic biocompatible, low molecular weight gel, 3D structures, solvent exchange, process
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:
 fragile, non-thixotropic biocompatible, low molecular weight gel, 3D structures, solvent exchange, process