Under shelf / cealing mounted spool storage

Instructions:

1. Filament Usage
   Note that printing 8 “sticks” will consume approximately 570g of filament.
2. Material Considerations
   Each stick is 16mm thick, largely due to the screws used. However, if you use thinner screws or adjust the honeycomb pattern thickness, you can maintain strength while saving filament.
3. Connection of the Sticks
   To connect the "sticks" to the shelf, you will need:
   • 16 (2 for each stick) 4x25 wood screws.
   • Dowels that are 20mm thick, and the length is up to you.
   • To fix the dowels to the ends of the sticks, use 4 (1 for each external stick) 4x16 wood screws.

4. Distance of the Dowels

   A distance of 170mm between the external portions of the stick shaft works well with my spools

Notes and suggestions: 
This solution isn't the most efficient in terms of filament usage, but if you already have a strong shelf and prefer not to drill holes in your wall, it’s an adequate option. However, if you're okay with drilling holes, I recommend searching for a design to wall-mount your spool, as it could save you around 30–40% of filament.

While it may not be a perfect design, it works for my use case, and I'm sharing the step files in hopes someone can take inspiration and improve upon it.

If you're confident in the strength of your screws, you could potentially design a Y-shaped stick to save even more filament.

If you you have space on the ground you should check out this project