Stackable 1Kg Filament Spool Holder

I've designed my own version of a spool holder that is stackable, turning it into a rack/shelf system. I designed it to be as economical as possible. There are many holes & cutouts to reduce weight & filament usage. These holes also can be used to stick the filament through to keep it in place, and you won't have to cutoff the bent end because it won't be bent with this design! You can stack these things pretty high without them falling over. I recommend putting rubber feet on the bottom holder to prevent further movement. I currently have 10 stacked ontop of eachother. Series available: V2.0.1: Standard height, fits Bambu spools & smaller spools. V2.1: Slightly taller height, fits slightly larger spools. Stacks the same way on V2.0 series Key notes & features: Fits a wide variety of spools from different brands Holes for filament end support, no need for a clip. Designed for minimum filament usage Stackable Sturdy, strong design. Weight/gravity forces go into the walls of the holders