This 3D model contains only the surface of the Klein bottle, i.e., it has no thickness. In recent years, although of no practical value, the Klein bottle has become very popular. One could say that its value is only that it is one of the few things that originates in mathematics and that is of interest to ordinary people (similar to mobius strip). A large number of people use such 3D models to create math-art 3D models that are printed on 3D printers and published on the Internet. For the purposes of online marketing, glassware workshops have competed to make as creative or complex Klein bottles as possible. You can even find pendants, children's hats and Klein bottle in the form of a Klein bottle.
If you are keen on this kind of creativity, feel free to download this 3D model of the Klein bottle and try to do something creative with it.