Fabrication and setup: 3D microfabrication was performed on a Microlight3D printer µFAB-3D based on a Zeiss Axiovert 200 inverted microscope equipped with a XYZ piezo nanomanipulator allowing the translation of the sample relative to the laser focal point, and a CMOS camera mounted behind a dichroic mirror to monitor the polymerization process. The laser module includes a microchip self-Q-switched frequency-doubled Nd:YAG laser (532 nm, 560 ps pulses, 11.7 kHz repetition rate, 11.5 mW maximum average power at the entrance of the microscope objective). Average laser powers were measured at the entrance pupil of the objective on a standard photodiode power sensor (S120VC, Thorlabs). The incident beam was focused with one of two different objectives (×100, NA 1.40, oil immersion, Zeiss Plan-APOCHROMAT and ×40, NA 0.95, dry, Zeiss Plan-APOCHROMAT). The laser power, the displacement of the sample relative to the objective and the scanning speed were computercontrolled via LITHOS software. The DOEs were introduced at the entrance of the dichroic mirror cube in the reflector turret of the inverted microscope. The samples consist of resin drops disposed on borosilicate coverslips (170 ± 5 µm thick). After the fabrication process, the microstructures were finally obtained by washing away the unreacted monomer using acetone (two successive 10-minute baths).