This article presents the design of a planar circularly polarized graded index lens. Each section of the lens is implemented with an anisotropic material made by a dielectric periodic structure. This anisotripic material changes the polarization from linear to circular, and simultaneously, it has the required effective refractive indexes that allows the focusing of the impinging wave as a lens. The design is made for Ka band and it considers realistic filaments and the previous experience of the authors to guarantee the viability of the lens to be manufactured via conventional 3D printing.