Wall-Mounted Spool Holder

Warning! I had two of these and they fell off of my wall. I think it had more to do with the strips I used, though. However, I see the flaw in my design. It works better upside-down, but that way it does not have the lip that keeps the spool on.

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Made to hold my spools of filament on the wall via adhesive strips. I used two large strips on the back.

Shown with duct tape for demonstration because I do not currently have a spare spool of filament.

The weight that it holds will large