Solder tip cleaning ball housing. Ideally you should use coarse brass (harder but more brittle copper alloy) or copper wool ball. Even dishwashing wool ball (provided the kind that won't burn) is better than using abrasives like sandpapers or files to clean the tip.
You can clean the tip easily by plunging into the housing during soldering sessions before re-tinning the tip to continue working.
You can reduce size to 75% scale if your wool ball is smaller. This would also make it pack tighter, could be desirable in some situations.
Can be printed without support, I cut a deep chamfer on its back side, let it rest on that face and print it without any supports or brim.
Insta video https://www.instagram.com/p/CLQdugdDJEj/