As wearable medical technologies take on an increasingly prominent role in how health care is delivered, pressure to make the development process for such devices shorter increases. This case study will recount one attempt at a do-it-yourself (DIY) development process and collaborative usability testing. I argue that these efforts can complement traditional usability methods used in the development process of a wearable diabetes technology and provide more immediate access to technologies that can meet the diverse needs of end users. The case involves an open source DIY project developed by parents of children with type 1 diabetes in order to remotely monitor the blood sugar levels of their children.