This is a simple cylindrical lithium button cell container for all 20mm diameter cells such as CR2016 and CR2032. The lid is a simple press fit with (off the top of my head) 0.2 - 0.3mm part to part spacing. It may be slightly tight when printed, which is by design since the friction surface is pretty small. You may simply need to slightly sand around the plug part of the cap to make it slide in nicely but not pop off. I've printed (and revised) this a couple times, so it should work "out of the box".After printing, the plug may need a very slight sanding/filing to make the fit on the lid perfect. It is intentionally slightly over-sized. If you're only putting a couple cells in this container, i'd advise throwing something else in there like a piece of paper towel or foam or whatever, to take up the space so the batteries don't tumble inside and potentially short.