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Optical waveguide segments based on geometrically unbound photonic crystalfibers (PCF) designs could be exploited as building blocks to realizeminiaturized complex devices which implement advanced photonic operations.Here, we show how to fabricate optical waveguide segments with PCF designs bydirect high-resolution 3D printing and how the combination of these segmentscan realise complex photonic devices. We demonstrate the unprecedentedprecision and flexibility of our method by fabricating the first-ever fiberpolarising beam splitter based on PCFs. The device was directly printed in onestep on the end-face of a standard single-mode fiber and was 210~$\mu$m-long,offering broadband operation in the optical telecommunications C-band. Ourapproach harnesses the potential of high-resolution 3D printing and of PCFdesigns paving the way for the development of novel miniaturised complexphotonic systems, which will positively impact and advance opticaltelecommunications, sensor technology, and biomedical devices.

3D printed waveguides based on Photonic Crystal Fiber designs for complex fiber-end photonic devices