A Reddit User, 3driven or in reality, Paavo Pirhonen of Helsinki, Finland, is a radiographer and electrical engineering student, broke his fifth metacarpal of hand after colliding with a car while cycling. He 3D Printed his own custom brace using Autodesk Inventor Professional 2016 and then 3D printing with PLA which he could remove daily, wash it and even go for swimming wearing it. The doctors were okay with it and he has now shared the design on Thingiverse.
Source: http://www.fabbaloo.com/blog/2016/7/27/questions-raised-over-home-3d-printed-wrist-brace