Mia-Studio is a rule-based environment to develop and maintain tailored model-driven transformations (from UML or DSLs to Java, C#, PHP or any text-based source code) executed from Eclipse or VisualStudio. The new version comes with an extension mechanism to easily derive existing generators from existing ones. This facilitates the development and maintainenance of complex generators which have to evolve frequently to take technical evolutions into account. It also facilitates the reuse of code production rules among software architects working on several generators. The new version is now completely based on EMF (Eclipse Modeling Framework). This allows reusing any model-driven component based on this standard.