The recent development of direct 3D printing methods for complex-shape functional nanostructures, such as focused electron beam induced deposition (FEBID) and two photon lithography (TPL) has created a need for advanced characterisation techniques to assess the properties of the deposited structures. In the case of magnetic nanostructures, conventional characterisation methods typically rely on synchrotron radiation techniques, such as scanning transmission x-ray microscopy or photoelectron emission microscopy [1]. While these techniques provide valuable insight into magnetic properties of the nanostructures, they require access to large-scale facilities, which is often limited. To address this limitation, the dark field magnetooptical Kerr effect system (DF-MOKE) was introduced [2]. This technique has been successfully used to analyse the switching mechanisms of ramp-shaped nanostructures fabricated by a combination of FEBID and physical vapour deposition (PVD) [2]. Figure 1. a) A typical ramp-shaped deposit made with TPL+PVD, with inclination angle of 40°; b) A hysteresis loop from the presented nanostructure; c) Dependence of the switching fields on the structure’s inclination angles. So far, DF-MOKE has been primarily used to characterise only single nanostructures with one reflection plane. However, modern magnetic nanodevices present geometries far more complex, with multiple planes of light reflection [3,4]. In this contribution, we investigate the feasibility of using DF-MOKE to measure complex-shaped 3D nanostructures. For this purpose, simplified systems were prepared with several reflection planes using a combination of 3D nano-printing by FEBID or TPL and covered with magnetic material using PVD. The presented data will show the measurements performed on the single nanostructures and arrays in close proximity. An analysis of coercivity as a function of geometry for single structures, and a comparison with measurements obtained in arrays of similar geometries will be presented. The advantages and limitations of using DF-MOKE as an easy-access, laboratory-based tool for characterising complex- shaped 3D nanostructures will be discussed.