Spool Arm Endstop - Ender 3

Got tired of my spools falling off the end of my spool arm, and didn't want to go the route of building desktop spool holders that don't fit my spools...or bending my spool arm.

Attaches easily and snappily into place. Install with flat/bottom side facing the base of the spool arm. If it doesn't snap into place it's facing the wrong way. It's more than large enough to keep any sized spool from falling off, and small enough it fits easily through the opening of any spools I've tried it with, so it does not need to be removed to change spools.