Patrick Slade, an undergrad in our lab, has been working hard developing Tact, a 3D-printed hand, which we plan to use as one of our research platforms and for field testing with patients in Ecuador. Unlike many other low cost, 3D-printed hands, instead of being tendon driven, this hand uses a four-bar linkage, which simplifies assembly. We have found it easier to tighten screws than to thread strings and cables through narrow channels.
There's still some work to be done to improve the hand, but we are happy to open-source our current iteration of Tact. The files can be found here.