This is a replacement for the plastic pin that holds the elastic band on a a Dell Laptop power supply.
This way of storing the cable is great, and this print replaces a broken or lost pin.
Print it, insert it.
There should be no need to tweak it, but you get the openscad file by the way (I measured it with a caliper from another Dell Laptop power supply).
More seriously, you probably want to consider a minimum layer print time (as I forgot), since the head is so small that it can melt as a whole on the end of the printing process. It happened to me but the pin was still usable and held the elastic band nicely.
I just used a lighter and metal rule to reshape it slightly to make it a bit more sexy... This is my first useful printed part :)
Update: sorry, I just realized that soehler already made this very specific thing (thingiverse is amazing!) http://www.thingiverse.com/thing:17007