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This paper investigates the design and fabrication of 3D printed waveguide and their application for the design of microwave passive components. This includes a simple waveguide structure, a band pass filter, and a leaky wave. A Lego-like approach is used to assemble together different 3D printed sub-sections after metal coating. These allow the structure to be fabricated in multiple layers. Simulation and measured results match closely. Details of modeling, fabrication and measurement are presented for these three passive components.

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