3x D Cell to 2x 18650 Adaptor

thingiverse

A pretty simple, if not long print job which allows you to modift devices that take those nasty D Cell batteries (who even uses those nowadays) and allows you to use 1 or indeed 2 18650 cells in its place. Pretty simply, its a battery sleeve that's the same length as 3x D cells, inside it is a hollow which allows for a maximum of 2 18650 cells and a slot for wires to be inserted into it. I personally used it to allow me to use 18650's in a 1W LED flashlight that I already had and liked, but in sure you can find an/other use for it.