Spool Holder Anti-Unwind Add-On

thingiverse

This add-on prevents the spool from unwinding when the filament is pulled by the extruder motor. It is an add-on for [AngryHulk's Spool Holder](https://www.thingiverse.com/thing:4834202). It allows the filament to be pulled freely until there is slack in the line, at which point the roll will be stopped from rolling by the bar that the roll sits on. Without the add-on, the roll may keep turning after the filament has been pulled, causing the filament to become loose (and possibly tangled) around the roll. There are two versions, one that just sits around the bearings, and one that has additional legs to hug the base of the spool holder. Both work equally well when a roll is present. The one without legs may be knocked off more easily when changing rolls. Install it with the bar away from the side the filament is pulled from.