Stackable Filament Spool Shelf system

update 09/05/2023: added a 23.6mm ID version following a request, hope it helps !

This is a second iteration on my original design. I designed this simple reversible bracket system to manage my spool addiction (see pictures).

- It uses a 20mm (or 18mm diameter wood rod , so it's fairly modular in terms of width, cut to desired size. For 18mm wood rod use the adaptor 18 to 20. - The system is now stackable !!! No guess work or measurement required, just install the next row of spool below the previous one (see picture). - Brackets can be installed up or down , or any combination of the two as long as they are aligned. - Backet is design so the wood rod can slide through . allowing for very wide shelf yet well supported, i.e. with as many bracket as desired per rod. - Once happy with the size, bracket has holes for small screw to hold the two rods in place, making the rack sturdy. Nothing will move ! - I added some rod cap for even better flexibility of the system. Hope it helps !