In this empirical study, the one-day project Robot Love Design-a-thon was designed for an interdisciplinary group of preservice teachers (in arts, sciences, and primary education), and evaluated through observations and learner reports. An analysis of the observations and the learner reports showed that having to go through a complete design process in a single day worked well: it facilitated the exchange of ideas and critical discussions between students concerning the project's socially engaged theme 'Tenderness and Technology'. In addition, interdisciplinary collaboration emerged as an important learning outcome. All students found working in mixed teams a relevant and educational experience as they could profit from each other's expertise.