I designed a variety of 3D printed containers to be used with the plastic lids that can be upcycled from milk or juice cartons. The containers are designed to be easy to print and to use as little plastic as possible.
When I saw these milk cap containers on Thingiverse, I thought that the idea was great. I later found another design. Unfortunately, the caps from the cartons in my household did not fit either of those two designs, and I ended up designing my own. I’m not sure why my caps did not fit, but it’s likely because the two designs above are from Europe, and I live in Canada. If you are in North America, then, likely, you would want my design.