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In addition to extra strength , fibers have also been used in 4D printing to control and manipulate the change of shape or swelling after 3D printing , right out of the printing bed .
 machanical property: strength; material: fibers; manufacturing process: 4D printing; concept or principle: swelling; manufacturing process: 3D printing; machine or equipment: bed
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:
 machanical property: strength; material: fibers; manufacturing process: 4D printing; concept or principle: swelling; manufacturing process: 3D printing; machine or equipment: bed