Filament Spool Holder - Stackable

Do you have problems storing your many filament spools, as did I? Try this filament spool holder.FeaturesDesigned to work with standard 20 mm aluminium extrusionsInfinitely stackable (accepts standard 20 cm diameter spools)It can be printed with any materialNo supports requiredAdditional hardware required2x standard 20 mm size aluminium extruded profile per holder (length varies, see below)You can usually get them with M6 threaded ends already4x M6 screw (min 10 mm long) per holderAlternatively,