Universal filament spool holder ( dévidoir support universel pour bobine )

This support is pretty universal, it accepts spools up to 100mm wide (different slots) and roughly all the diameters (150 to 400mm).
This support can be placed on a desk or mounted on top of machine as in my case (glued with some double-sided tape).
Works well even with the filaments little tangled on their spool.
Requires only 4 ball bearings (outside : 13mm, inside 4mm * 7mm width) :
http://www.banggood.com/10pcs-624ZZ-4x13x7mm-HCS-U-Groove-Sealed-Ball-Bearings-Guide-Pulley-Ball-Bearings-