Simple Spool Holder for Prusa i3 Aluminium Frame

Maybe the simplest spool holder for Prusa i3 Aluminium frame (6 mm) you can image.

Additionally required:

One 8 mm rod, recommended length about 29 cm.

It's working perfectly for me :-)

P.S.: With a length of 18 cm, It is printable on a Prusa i3.