Mac power cord clip

You know how Mac AC power cord has a mind of its own and always want to spring back to a straight line? Yeah, that's cool and everything until you try to coil it up neatly around the Mac AC adaptor and stuff it in your laptop bag. Upon checking it later, you always found that it has managed to turn itself into a rat nest.

Well, here comes the rescue. This is a larger and improved version of my earlier "Smartphone USB cable clip (3mm)" design which you can check it out at http://www.thingiverse.com/thing:49127.