Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5509412.

Edit 20/04/2020: I would suggest you use my recent remix, as it offer more flexibility:

• https://www.printables.com/model/175051

Most bracket are placed under the shelves but I had this weird tiny space where I couldn't install bracket under the rack… So I designed this simple reversible bracket system for storing filament (see pictures).

• It uses a 20mm diameter wood rod, so it's fairly modular in terms of width, cut to desired size.
• 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, racket has holes for small screw to hold the two rods in place, making the rack sturdy. Nothing will move !

Hope it helps !

Original model has been moved to Printables.com:

• https://www.printables.com/model/148662