The Kestrel is an open source 3D printed upper limb prosthesis that has been designed to be fully parametric. As such, it can be easily adjusted to fit a wide variety of people and can also be easily modified to fit many unique needs. The Kestrel provides all of this at a low cost of manufacture, and the assembly process required in its construction is simple and well documented. It is a great option for many low cost upper limb prosthesis needs.
The CAD files, as well as the manual for this project, can be found at the link below.