This is a set of 3 recycling boxes to recycle batteries, bottle caps and coffee capsules. Each box can fit smoothly on a 250ml can.
Each box is split into two parts to be printed in different colors. You can either print in one shot if you have a dual head printer (I tried with success for one of the boxes), or more simply (and recommended) one piece after the other. In that latter case, the coffee capsule and battery top can be inserted with a snap fit into the box. The bottle cap is to be glued on top.
Every single piece has been especially designed to be printed without any support. Smooth and simple !
You just need to remove the top of your 250ml cans and clean them. The easiest method is to file the rim until it pops out. And then you put the box on top, and it fits !
I have used OpenScad for the 3D design. I have included the openscad file. It is properly commented and if you want to change anything, for example set up to 330ml can instead of the original 250ml can, well you can !