I didn't have any magnets on hand to make use of Jal Shah's excellent lead screw cleaner, so I incorporated it into a print in place clamshell design. It has two tabs to stop it from spinning and to assist in getting it open. I printed this with a 0.6mm nozzle @ 0.2mm but will turn out just fine with a 0.4mm.

No supports are required, however, I recommended printing with enough bottom layers to make the tabs solid, to ensure their strength.

The tool works well on a Prusa Mk3S.