IDK why they use rubber whereas knock-offs use silicone gaskets which make a more tight seal (even if said knockoffs never really work).

The knockoffs don't function properly (burn and spit coffee) probably due to different dimensions - I invite anyone to explain what is so critical about the original design. Here's one that doesn't work: https://homla.com.pl/mia-mokka-zestaw-kawiarka-czarna-z-2-fi...