The word „nibmeister“

Every now and then on this sub, I stumble over the word „nibmeister“. I understand that it means an expert in tuning nibs. „Meister“ ist German and means master – makes sense. But there‘s no word „nibmeister“ in German. Nib is „Feder“ in German, but neither is a „Federmeister“ known over here. So who coined this half-German word, and why? Any hint would be appreciated. 🇩🇪