Various electromagnetic crystal (EMXT) based THz components, including filter/reflector, waveguide, antenna, and transition structure to planar circuits are proposed and simulated. Several of them have been fabricated via a THz rapid prototyping technique, and the measurements show very good consistency with the simulations. Potential integrated THz micro-systems, as well as THz integrated circuit (IC) characterization fixtures, could be constructed using these components. The layer-by-layer printing virtue of the rapid prototyping technique may enable the integration and packaging of various THz components in a systematic manner. © 2011 IEEE.