We have had two or these eggcups and they like to use and regularly. We were very careful. They never came in the dishwasher. That the hammer can not be used, little bothered us. Today, however, the hinges are so broken that we had to dispose of it in two. To be precise: one hinge has always already begun and is now down completely. The other is broken from now on equal apart.
Because we so liked the egg cup, we are the same in the WMF shop in Main-Taunus-Zentrum (MTZ) and looked at the Eicher cup. If yes may be that newer were improved at this breaking point. But Nope ... Even after 2 years still the same poor workmanship! Pity!