Disclaimer of liability: This design should be considered experimental, and you use it at your own risk. I cannot be held responsible for any damage or injury caused.

I wanted to make shelves using dowel rods to hold my filament spools in an organized fashion, while allowing them to be individually vacuum sealed. There are a few similar concepts out there, but I couldn't find any that fully matched what I had in mind, so I just designed my own.

The x-shaped design of the arms should make these way stronger than needed, and it allows them to print with only minimal supports (around the screw holes). And the fact that these shelves use only one dowel rod means the filament spools are resting partially on the wall itself, thus taking some amount of the pressure off of the brackets.

The only portion I'm less than fully confident about is where the screws go through. If anything fails, it'll be a layer split there. But I printed using plenty of walls and top/bottom layers to beef that up, and so far they've been holding up fine!

I used 3" wood screws to mount these directly into studs behind the walls, and I used 7/8" dowel rods.

I included three versions of these brackets to facilitate dowel rods of different diameters. Compensating for tolerances in both the 3D-printing process and the dowel rods themselves, the sizes are 25mm to hold 7/8" dowel rods, 28mm to hold 1" dowel rods, and 34mm to hold 1 1/4" dowel rods. (Ah, the joys of living in the US, where I have to pair imperial-based materials with my metric-based designs.) I've only tested the 25mm version.

I'm sure you could fine-tune those measurements further by slightly scaling the whole model. Just don't scale it too far or the rod will end up too close or too far away from the wall.

As always, if you enjoy this design, feel free to tip me a coffee!