One of the main prerequisites in finger vein research is the availability of comprehensive, available finger vein datasets. In order to capture such datasets, a biometric scanner device tailored to capture the vascular patterns is essential. A sophisticated scanner design is the key to achieve a good image quality, robustness against external influences and finally to arrive at a competitive recognition performance. In this chapter, a fully open-source, modular and multipurpose finger vein scanner design is proposed. Two novel finger vein scanners are derived from this basic design. Both are able to capture reflected light and light transmission illuminated images from the dorsal as well as the palmar side. Three fingers are captured at once. The first scanner is based on widely used near-infrared LEDs as its light source, the second one on near-infrared laser modules. Despite their advantages in touchless operation, near-infrared laser modules have hardly been used in finger vein recognition so far. Our scanner design has proven to accomplish an excellent recognition performance using common finger vein recognition schemes. All details regarding the two scanner devices, including technical drawings of all parts, models of the 3D printed parts, control board schematics, the microcontroller firmware, the capturing software, parts list as well as assembly and setup instructions, are available free of charge for research purposes. This should facilitate interested researchers to rebuild such a scanner device for capturing finger vein data on their own. Keywords Finger vein scanner • Open-source biometric sensor device • Light transmission • Reflected light • Open finger vein dataset • Dorsal • Palmar •