All Ikea Cupboards have many unused holes. Especially in the kitchen that is a really attractive area for moths to lay their eggs. For this reason this plug fits the holes of ikea cupboards, and all other 5mm holes for that matter.

It just takes a minute or so to print, and on my 20x20 print plate I can fit 20 easily. Coincidentally, it takes about the same time for me to place all the plugs in the cupboard, as the printer to create another batch.