The study presented here explored the experiences of inter-disciplinary teams of co-designers, including persons with intellectual disabilities working together for developing and implementing an accessible museum educational programme, including the production of 3D printed artefacts and the use of Tangible User Interface (TUI). A qualitative co-design research approach was employed. Data collection involved an initial short survey questionnaire, co-designers logs, interviews and focus group. The questionnaire was administered to museum staff and other stakeholders for mapping existing situation and views. Participants of the co-design process were involved in designing and implementing a museum educational session. Findings indicated the views of participants on barriers and challenges in accessing museums, as well as their positive experiences and satisfaction with collaboration and interaction around and with technology during the co-design sessions and the educational programme.