Based on two years of ethnographic engagement in a school-based digital design studio in a high school on the West Side of Chicago, Illinois, this paper conceptualizes the development and maintenance of an ethos of care in teaching and learning through "sustaining affective resonance." Adopting musical metaphors as a vocabulary for affective movements, we operationalize practical and practiced methods for sustaining (actively extending) affective (care-giving and care-taking intensities) resonance (shared meaning making and cultural production). Sharing examples across years, we show the specific ways that mentors and students in the digital design studio built and nurtured care-full practices. The purpose of the paper is to explicate the development and enactment of mentoring practices that we observed in the design studio and then to consider how these practices might be shared, spread, and adapted across contexts of teaching and learning.