Salt is very important for making delicious food, but you cant eat too much. This container can give you a certain amount of salt when you put the spoon under the hole. There are two magnets in the container
and spoon, and their magnet pole are opposite, like N and N or S and S. When these two magnets get close, the plug will be pull back, the lower hole will be open, and the higher hole will be close. When you take the spoon away, the plug will get back to bottom by the gravity.
This model use the magnet 4mm*1.5mm, you can change the stl file if you have different size magnets. Then you stick the upper part and the lower part, don't forget put the plug in. At last you should find a bottle that fit
the machine size.