A few of the nocks kept falling out of my arrows. Friend gave me the idea to print replacements. This is the result.
Due to small size, probably best to print with small layer height, slow speed, 100% infill, heated bed and/or brim.
I've only test printed 1 so far (pictured), with .1mm layer height, 30mm/s speed and on heated bed (no brim). It warped a bit, slower speed/brim might have helped.