MUST allow support not only on the platform, otherwise the second ring will not work well.

If someone wants to add more rings, you can do it in Blender or write to me in the comments, I will be happy to help you

The model is a regular telescopic cup with a lid, which is very convenient to fold into a flat "tablet" for carrying. I added a ring to the lid so that the cup could be conveniently attached to a backpack. According to tests of the small model, the cup does not leak, I advise you not to print it from flexible plastic. The walls are quite thick, since otherwise my printer refused to print them