Filament spool holder

I built this spool holder because i had a need for a system able to hold filament spools made from carton with a 25mm spool hole.
Adapted the spool-holder from here http://www.thingiverse.com/thing:767334 and made a stand that matches my need.

+ you will need 2 608Z ball bearings a 160mm (or longer) piece of M8 rod, 2 M8 washers and 2 M8 screw nuts
+ screw the stands on a piece of wood or directly on the table
+ fixate one of the spool-holders with the nuts and washers as seen in the pic