A fast to print filament dust remover box. Just stuff some microfiber cloth oder foam into the box, place around the filament, put another layer of cloth/foam above and close it. Can also be used while the filament is already mounted.
EDIT: added a v2 with half-circle arms for the lid, which greatly reduce the risk of breaking when removing the lid again. This thing is rather tiny, so are the walls, really depends on your filament if v1 works or not. 😉