I designed this for my middle finger that had pain in its PIP joint. The rough dimensions of my finger are labeled in the screenshot that I took (it says “m” for meters, but it's really mm for millimeters—Blender is weird). I recommend taking it into Blender or something similar to scale it to better fit your finger.
I printed one version in TPU, but it actually wasn't very comfy due to all the bits of buggers and stringing that were hard to remove completely—this PLA-CF version is actually more comfortable, but normal PLA should work fine as well.
Can be printed without support.
The author marked this model as their own original creation.