This is modified version of my motorized to work if you have still access to wrist.It's meant to be easy to build, cheap and material vise accessable for everyone. What you need is string to run under joints and through palm to the string holder. Any kind of straps to have your hand connected. Elastic bands for the top of the fingers, 2x m3 screws and bolts and finally any kind of glue, I personally used hot glue. I also cut out a garden gloves fingers on for extra grip.No special print settings or specific material needed. I personally made this out of PLA with very default settings and added supports.On the video is used ver4-15cm for the palm. Fingers or joints as they are separated on files you can print however you want. Ver4-wrist is same for everything.

Short clip of use on the link.https://youtube.com/shorts/WPcr_kOesps?feature=share