I needed an easy spool holder. I liked http://www.thingiverse.com/thing:996398 which is a wonderful design but that kind of pins are always a pain for me, they break and not spin.
This design is just a test, my print is not the final design, just wanted to check if it works.
It is easy to print and to assemble, I just need one that works.
You may scale down a bit (3-4%) the pins if your printing is not very precise so that it fits the wheel easier.