Utility Band is an open source assistive device that is designed for partial upper limb. It uses simple velcro wrap to strap around the arm.
3D print Instruction:
This design is printed with two materials, flexible filament (TPU) and hard filament (ABS, PLA, PC, Nylon, etc).
All the orange parts in the photos are flexible and the grey parts are hard plastic.
The attachments easily lock in the flexible center piece. Attachments include the following:
For 3d print shops, use Loctite super glue for welding the parts together: