Hatchbox Filament Clip (1kg, 1.75mm)

I saw a couple different versions for this spool, but none of them are really that good. They all seem to relay on squeezing the side of the spool which is flat and smooth. I designed these to clip in the recessed areas on the spool so they don't slid around.

Use Directions.
1) Put the clip on first with the fatter side on the notch
2) Slide the filament in from the bottom after attched