This is a three pronged robotic gripper designed using "Blender" and printed on an Ultimaker 3D printer.
The basic principle is simple - when the gripper grips its object the gripper itself conforms to the shape/form of the object through a combination of linkages and flexing normal PLA plastic.
The wire linkages between play an important part in swinging the geometry of the appendage around.
The basic system uses three appendages driven by a simple HS-311 servo converted into a linear actuator.