On the Overlord and Overlord Pro, wires can chafe against the metal shield around the top of the hot end. This object protects the wire bundle from the sharp edges of the shield. Print at 0.1 mm, no support needed. remove the 4 screws holding the shield on, and snap in from inside the shield. ( The two screws closest to the angled fan don't need to be removed) Reinstall shield: tighten the side with two screws first, then the side screws.