The combination of the laser powder bed fusion of metals process (PBF-LB/M) with mechanical finishing using state-of-the-art machining centers enables the production of high-performance structural components with both internal and external complexity and precision. However, the sequential machining of additive manufactured parts can be challenging due to the need for multiple clamping set-ups and part-specific clamping devices. Post-processing typically accounts for 20-40% of manufacturing costs and can even double the cost of the final part. To reduce component costs, mechanical post-processing should be considered. This study presents a novel concept for the development of resource-efficient add-on structures, that can simplify mechanical post-processing. These structures can either be applied to the part design prior to additive manufacturing or integrated into the part's support structures. The developed structures allow the direct mounting of near-net-shape components on automatable, state-of-the-art parallel clamping systems. The structures are designed to clamp the parts with increased accessibility for 5-sided simultaneous machining. The additional material costs are calculated within the work. The procedure for generating the add-on structures for additive manufacturing, using bounding box, topology and shape optimization is presented. The mechanical behavior of the add-on structures is verified by clamping and measurement tests. The developments were validated by the manufacturing of 3 different components from the aerospace and laser technology sectors, using PBF-LB/M and aluminum alloy AlSi10Mg. The overall functionality of the add-on structures was validated by finishing the functional surfaces of the components and mechanically removing the support structures, using 5-axis vertical milling centers.