Solidoodle Filament Anchor

When not using a spool of filament and I don't want to take it off the spool holder, I got into the habit of blue painters tape to keep the unused filament from flying away and unspooling itself.
Looks better than tape, too.

This is designed for 1.75mm filament. Sketchup file is included in case someone prefers 3mm or has a better idea.