In the current trend for miniaturization of optical systems, the FEMTOprint laser-based glass micro-machining technology allows 3D freedom in design and fabrication. This is as well as the possibility of monolithically integrating several functionalities within a single optical system, thus avoiding complex assembly steps, while allowing for a high level of complexity. Moreover, it enables the access to fast prototyping and pilot production, while guaranteeing the possibility of up-scaling to volume production.