Down-scaled the original to 90% and added a 15mm diameter ring to spruce up my son's Halloween costume.
If I wanted to print one for my 20mm finger (which I probably will), I'd scale up 33% in all directions before printing. Simple

Might get away with lower resolution, but printing at 0.1mm only took 45 minutes per claw.

My settings...
0.3mm nozzle, 0.1mm resolution, 7% infill, 0 solid infill threshold, 2 perimeter, increasing part cooling especially for the tip. I ended up blunting the tips post print because they were too sharp for a 4 year old to play with.