HeliosCube-Eleni: Open-Source 1U CubeSat

-Petros Mandouvalos ( mpla-Exotech / Athens )-Christian Neumann ( DLR / Cologne ) Boost MeA 1U CubeSat designed for microgravity testing with off-the-shelf sensors and a 3D-printed structure This paper presents the design and development of HeliosCube-Eleni, a 1U CubeSat created as a demonstration satellite (demosat) for the MAPHEUS-16 mission of the German Aerospace Center (DLR). Intended for testing in microgravity conditions, the satellite emphasizes practicality and affordability by utilizing commercially available sensors and a 3D-printed structure made of carbon fiber reinforced material, complemented by aluminum panels. All designs are open source, promoting accessibility and collaboration. This work outlines the satellite’s philosophy, components, development process, and planned validation, showcasing a model for rapid, low-cost space technology development. CubeSats are miniaturized satellites that have transformed space exploration by offering a standardized, cost-effective