I was missing one of the weights for this nice cuckoo clock I have. So i designed up this simple printed jar. I needed a ~1 kg weight to match the other one so that's what this jar is sized for. The cheapest material i could come up with to fill it is nickels. 5 rolls of US nickels ($10) is almost exactly 1 kg. All other filler material wasn't dense enough or was very costly. but i think brass BBs or Lead fishing weights would work well too.

You can open the .f3d file and edit the size of the jar to fit your weight needs.