This is a remix from CHRJAN design which is for the left ring finger but I'm sure it could work for other fingers also.

Changes:

• I needed my finger to not flex at the knuckle so I added a tab at the palm
• I also added a vent hole in the inner side
• Removed some of the tip off since I didn't need it to cover that far up

TIP: For getting the fit right heat it up with a heat gun, hot water, or let it set on your print bed for a while.

I have it scaled for my finger size which is loose at about 20mm at the base.  You will probably need to scale it for your finger size.

See the .3mf file for how I printed it. Since with my modifications there isn't a good flat surface to print from.  I used a raft and set the supports to be really close to the print for stability.  With PETG the supports still broke off easy but there a little sanding is needed.

This is significantly more comfortable than the foam and aluminum one I got from the doctors.

**I am not a medical expert so use this at your own risk.