There are two versions of my pin:

   Close (with hole inside)

   Open (for endless rope)

You can print it without support in one piece, because there is specially designed flat surface. 

Due to the intended use it is recommended to choose a 50-100% infill.

Prusament PET-G is the best material for this type of prints!

Of course, you can choose different size.

Mango-Yellow pins on photos are 100% = 17,5cm long and Chalky-Blue pins are resized to 75% = 13 cm long.

Resolution 0,2mm is enough.

Have a fun!