We made these for a cosplay costume of our favorite zombie, the witch bride!! Ahhh!!
More photos and info here:
These are claw finger extensions intended to be a support structure for prosthetic appliance. There are three files, the left/right thumbs, and a 'generic' middle finger. You could probably just scale it to fit your middle finger and print 8 of them, but I think it looks much more interesting if you print scaled down versions for the pinky fingers. (In total we used 4 different sized fingers, including the thumbs.)
The part that covers the top of your finger is intended to be a knuckle, it has an angled opening so the wearers fingers are still somewhat functional.
The largest prints in the pic had to be rotated at an angle to fit my Replicator 1 HBP. Luckily they fit! :)
Be careful with these, ours were crazy strong and a little too sharp. We sanded down the tips, as the zombie is also my GF and we don't need any real injuries!