Anycubic Kobra 3 Sling Arm Fix

A fix for the Kobra 3's print head not getting close enough to the magnet to pull the purge sling arm back. This simple fix just hooks into place and keeps the magnet about 2mm closer to the print head so that it catches every time.

Update 9/12/2024: Added slightly wider version (7mm) for anyone still having occasional issues with the magnet catching.

Update 9/28/2024: I had issues with the piece falling off occasionally during printing so I increased the size of the top lip which should hopefully hold on better.