In the course of the 3D city modeling often data from different sources and system environments have to be combined. The software system FME (Feature Manipulation Engine) from Safe Software Inc. allows to convert data between different formats and to automate typical data processing tasks. We have many years of experience in the development of FME work routines (workspaces) and the use of FME for 3D operations. With the help of own FME Transformers, we are expanding FME's range of services in order to be able to process tasks in the 3D space more efficiently. Based on this, it is possible to create cost-effective user-specific routines and deliver them to customers. This enables them to perform typical 2D and 3D data processing much faster. Interfaces between different CAD and GIS software modules can also be implemented with little effort.