Highly freedom of design.
By merging multiple parts into one piece, the assembly fee can be lower and higher reliable.
With injection method, efficiency can be more higher than others.
There are various material, depend on what kinds of feature.
Notebook's hinge, lens, cellphone, tablet, wearable electronic, fiber connector
wrench, pliers, hydraulic, automatic parts
Dental braces, medical tools
Car and Scooter, airplane, bicycle