The document describes the agreed plan of action for the Task 10.3 “Development of advanced engineered solutions for the hydraulic interconnection of multiple micro-structured silicon cold plates”. The planned R&D activities aim at different objectives: Review existing results in the use of PEEK for 3D printed connectors, obtained in the first year of AIDAinnova but also by other projects) and produce PEEK prototypes with improved printing techniques. Develop 3D printing on different materials and compare with the available results on PEEK. Improve the design of the prototype connectors to optimize it to the features of the used materials and in synergy with Task 10.2.