A 'nail' to use for the old and rare yarn craft of Nålebinding, which has many spellings.

I can't nailbind, but I've designed these for people who can.

The Wikipedia article on naalbinding: https://en.wikipedia.org/wiki/N%C3%A5lebinding

Here are two files, both with two holes and are asymmetrical in the z-axis. One has slots along the length for grip on one's fingers and the other is plain. They are 70mm8mm3mm in size.

Artillery

Artillery Sidewinder X1

No

No

0.1mm, adaptive (need it smooth as possible)

100%

They can just be printed flat on the bed, as the bottom side is flat.

They need to be as smooth as you can get in every direction to avoid catching the yarn (the one in the photograph above is not smooth at all). Minimise stringing, blobbing and layer height. You may wish to sand them or put nail polish on them as well.

Using a resin printer might be a good idea for smoothness if you have one.