This thesis is concerned with exploring just how to develop products in line with this frugal methodology through the case study of a hand exerciser. This main research question for this design project asks to what extent can FDM 3D printing be applied to assist Kenyan occupational therapists in the provision of therapy to individuals with hand dexterity and strength challenges. This self-initiated graduation project is being completed in collaboration with Kijenzi (www.kijenzi.com) - a design and manufacturing company based in Kenya. Kijenzi is using additive manufacturing technology to produce products locally using low-cost FDM 3D printers. Research into the context of occupational therapy, additive manufacturing, and the context of Kenya revealed the following key insights: Professionals in Kenya do not have access to suitable tools because of their high associated cost and the challenges involved in importing the products and distributing them into rural locations. Traditional hand exercisers can have drawbacks that hinder patient recoveries. 3D printing is a laborious process and partially digitizing the process could lower production costs. Occupational therapists require products in a large range of sizes and strengths to suit the individual needs of their patients. This could be achieved in a product customising system. The synthesis of the insights gained in the research activity created an envisioned scenario which involved a product/service/system scope. In this scenario, patients can exercise their hands safely in a purposeful way with a meaningful outcome. Healthcare professionals would be empowered to order customised products from the manufacturing company by means of an online product customiser. The manufacturer would then be able to produce these customised goods in a way that minimises the cost of doing so. A list of requirements, design drivers, and design challenges were prepared as support to design activity. The HandBand product, service, system (PSS) concept is a holistic structure which affords the provision of patient-specific hand therapy. Through the use of the 3D-printed therapy device, an online configurator, and a production system, the concept’s full design articulation is achieved in a low-cost and feasible manner. The three-part proposition aims to provide impact for key stakeholders in both the Kenyan healthcare picture and the Kijenzi context. Six levels of the European Space Agency’s Technology Readiness Level were followed to embody these design proposals. The ultimate validation in this involved a test of the 3D-printed product in a clinical setting in Kenya. The outcome of this evaluation for the product was clear and decisive: the occupational therapist confirmed that the HandBand had made a significant contribution to the recoveries of multiple patients. The hand exerciser was a marked improvement to the current equipment and tools available in the hospital. Conclusions were derived from the feedback in the final chapter. Finally, recommendations were prepared for the development of the design proposal in future.