Creating an electronic circuit inside a tiny prototype can be challenging for design students. Studies on design students’ circuit assembly tasks on tiny prototypes are scarce. This study investigated how students assemble circuits in tiny prototyping and which factors influence these activities. We analyzed the students’ prototypes and discussions using the grounded theory framework. We observed that tiny prototype circuits might be characterized by volume, composition, structure, dynamics, and isolating properties. Planning and the varied availability of conductive and circuit support materials might facilitate experimentation during circuit design. Our results shed light on the need for additional study and the development of boards and electronic componentry for educational practitioners.