Additive manufacturing has attracted increasing interest due to the large number of applications that can be addressed, from aeronautics to medical devices and optics . Large surfaces with micron and sub-micron patterns such as lens arrays for sensors or micro-needle arrays for drug delivery are part of the structures that can be built by two-photon induced polymerization (TPP) also called direct laser writing (DLW) . Through focusing a laser source into a small volume of liquid resin with a high numerical aperture objective, this technique enables the fabrication of complex and highly-resolved three-dimensional (3D) microstructures.