I needed a needle threader and so I made this model out of necessity. It works surprisingly well. The trick was to make the threader part only one layer line tall.

Use this print profile to get the best print results. PLA printed on a PEI surface is recommended for best adhesion and release without needing to use a brim or glue for bed adhesion. Be sure to wait for the print plate to completely cool before attempting to remove it, otherwise damage may occur to to the delicate threader part.