I designed these spool holders to hang filament spools on my shelving frame.

There is a smaller size for hanging on the out side of the frame and a larger size to hang on the inside of the frame. I use the Pinnacle adjustable shelving frame system that I purchased from the hardware store.

I have found that these holders will accommodate most commonly used spools. Should you find that your spool is not a good fit contact me and I will provide you with an .stl that will fit your spools.