Just a basic spool holder with a hole for one screw. I had a filament lead so that spools don't become tangled or unwound. I need a spool holder that would keep my filament from coming undone so I made one. Just one screw is all you need to affix this to your 3d printer frame.

If your frame is not made of metal extrusion, you can mount this on the wall next to your printer or use a nut and bold to attach it to a hole in your 3d printer body.