3D-MosquitOprint researches the integration of optically transparent waveguides in cavities on three-dimensional circuit carriers. The manufacturing process is based on the Mosquito method, in which a light-conducting core is dispensed into a liquid cladding polymer. Afterwards, the structure is cured by UV light. For use as electro-optical hybrid components, there are also investigations into efficient coupling between manufactured waveguides and diodes. For this purpose, the end surfaces are prepared and assembled with diodes.