I needed a shelf for my filament spools, so this is what i created. A hexagonal bracket with end pieces. Fits with a aluminum tube which has an outer diameter of 15.5mm and an inner diameter of 12.5mm.

The alu-tubes are meterware from a local hardware store. Saw the tubes to the required length, put everything together and the shelf is ready for use.

Printed on a BambuLab X1C with Prusament PETG:

• 0.4mm nozzle @ 0.2 standard layer height
• Walls & layers: 3 on all sides
• Infill: 25% Gyroid
• no other settings changed