As team lead for Columbia's Micro-G NExT teams for both the 2018-2019 and 2019-2020 seasons, our design challenge submissions were selected for two years in a row.
In 2018-2019, we developed a prototype device to smooth protrusions on ISS handrails, which are formed by micrometeoroid debris. These pose a serious hazard during spacewalks.
In 2019-2020, our team created a stabilizing jig for a handheld drill, specially designed to be suitable for a lunar environment.
Both years we had the exciting opportunity to have astronauts test our devices underwater and give constructive feedback, with the final iteration of our designs tucked away for NASA's future study.