Q. What is a ejector pin?

Answer

Bouncers for injection molding, ejector pins are used to remove molds from the mold cavity. When used to eject a component from a mold, these tools can be powerful enough to leave visible scars. Round ejector pins are used by Protolabs, and where they are placed is determined by a variety of variables. Some sections of the part may stick to the mold due to factors such as draft, texture of sidewalls, depth of walls, and ribs. Pin size and placement can be modified depending on the resin used. However, some resins are "stickier," meaning they need more force to be removed from the mold.