3D Printing of Functional Metal and Dielectric Composite Meta-Atoms.In this report, a novel fabrication method, based on casting Field's metal inside dielectric molds made via fused deposition modeling, is presented.  Fused deposition modeling (FDM) has become one of the most common rapid prototyping methods.  A wide range of thermoplastic materials used in fused deposition modeling have been investigated, to identify the best candidates in terms of processing temperature, relative permittivity, and loss tangent. 
Fused deposition modeling
3D Printing of Functional Metal and Dielectric Composite Meta-Atoms.In this report, a novel fabrication method, based on casting Field's metal inside dielectric molds made via fused deposition modeling, is presented.  By using Field's metal to transform dielectric molds into conductive structures, nearly any continuous metal geometry buried within the polymer can be created, allowing for the realization of complex 3D architectures. 
Field's metal
Experimental measurements and X-ray computer tomography scans are used to determine the quality of structures fabricated using this method. 
X-ray computer tomography