I wanted a small footprint storage method for my filament spools and came up with this design - is a mix of printed interlocking brackets on the ends and some 1x2" furring strips as the vertical poles and the weight-bearing beams across the width. Furring strips are basically the most inexpensive lumber you can get, typically around $1.60 for an 8 foot board. The brackets are designed to fit furring strips from Home Depot/Lowe's perfectly, and have extra bracing on the weight-bearing bottom side as the brackets actually support the weight of the spools. The file also contains feet which slide right on, I suggest printing them in TPU.

The brackets are printed in two pairs which slide together perfectly and firmly, add a dab of superglue as you slide them together to strengthen the connection. Originally my design used wood on the ends but after realizing the distance is only 5-6" I opted for filament.

I suggest printing them in the orientation in the 3mf file, this way the weight-bearing portion of the brackets are in an ideal position. However, that means the portion that prints vertically is not - this is alright with this design because there's not much force in that direction, all it's doing is holding the front and back vertical poles together. I also suggest printing with the manual supports in the file which ensure nice round screw holes and prevent the vertical portion from wobbling, though if you have your printer really dialed in and go slow you don't need them.

Some other notes… I painted the wood with the budget $2 gloss black spray paint from Lowe's, 2 cans did the trick. Priming isn't necessary. I set the brackets apart by 8", you can go with slightly less. When buying the wood note that since furring strips are very often not straight, so expect to spend some time in the store examining them to find some good ones. Typically you'll find the straight ones still bundled up, I probably looked at 40 boards to find 5 straight ones. Last, putting this together is a good amount of work especially if you sand and paint the wood, but the brackets do make it pretty easy.

Materials:

• 1x2" furring strips, 8 feet each
• ½" #6 wood screws (slightly longer or larger would work fine too). You'll want quite a lot of these, I got a box of 100 for under $4
• Superglue for brackets, wood glue if desired
• Spray paint or stain