Spool Holder - Just "clip" to Extrution - Very Easy Mount

Hey Guys,
I will present my new spool holder for my 3d printer. You can easily "clip" it to your extrution.
In addition you need a long screw or something to connect the two printed foot-clips. (see the picture)
It's preferable to use a bearing and this awesome print: http://www.thingiverse.com/thing:75468
So, have fun :-)