Traditional method of fabrication involves the conventional process of Subtractive manufacturing. Ant object is made by manually cutting the material generally with CNC machine. The desired shaped material is obtained and rest of the material is discarded. This requires elaborate infrastructure and is a tedious lengthy process. This is being gradually replaced by a contrasting technology of additive manufacturing. It is based on principle of stereo lithography that creates three dimensional printing. More recently, four-dimensional printing is becoming the accepted method of fabrication.