I found these on Thingiverse although quite big. Re-scaled to use with my LOTR as little Nazgul counters. They work pretty good! I've been printing so many I decided to upload the print profile I'm using for everyone. These dice range from +1/+1 to +6/+6 each, or -1/-1 to -6/-6 depending on which plate you are printing.

Downscaled from 50mm to 16mm, feel free to adjust however you need. I've included the stl files from the original designer on Thingiverse for the regular text. If you want the bold text you will need to follow the link to Thingiverse and slice this yourself. The regular ones have suited me very nicely!

Added plate for negative counters too. Now you can print these directly from Bambu Handy without ever touching a PC. You can split into parts and remove dice if desired, or make additional copies to fill the print plate, as well as print positive AND negative counters.