The problematic of interconnectivity between different micro-channel devices still represents one of the most challenging aspects of micro-channel cooling and a fundamental limiting factor to a more generalised adoption of this high performing approach. This issue has been investigated by studying in particular the integration of 3D-printing techniques based on new materials. The work aims at greatly simplifying the design of some of the parts, and at studying the integration of the connection in the interior part of the cooling element. Based on initial studies, prototypes of hydraulic interconnecting elements were tested on produced samples and results are presented in this report.