In this article, an overview of three dimensional printing, also known as additive manufacturing (AM), with a focus on polymers is
presented. As a starting point the additive manufacturing concept is described. Several well established technologies, including their
advantages and drawbacks and a list of polymers, which are commonly used in commercial printers are evaluated and outlined. The
additive manufacturing applications together with the key developments are also presented. The article further highlights major industrial
applications, directions for promising research are identified, possible full exploitation potential of additive manufacturing in industries
and finally outlines future challenges in this rapidly growing industries.