Barkeeper's Friend's Friend

Barkeeper's Friend's Friend is a lid designed to securely fit over the top (and bottom) of a 21oz can of Barkeeper's Friend.  Keeping a lid on the top can keep out some moisture and accidental splashes of water, while putting one on the bottom will keep the underside from rusting. 

Important: These were designed to be printed in TPU or other flexibles.  The tolerances are very tight as it is designed to form a seal at the top.  If you print this in any hard plastic, it probably won't fit, or you'll never get it off.