This is a holder for 3 cans or other items.

It hangs off a shelf that is 20mm thick (Billy Bookcase). It has inserts that can be used if you need a bigger lip on the bottom for smaller cans or other items.

While hanging it only takes up the space of a single can on the shelf.

It can be printed without supports when oriented on the flat face

One of the inserts is a sleeve with no bottom and one has an enclosed bottom.