Rub resistance is a parameter of major importance for the quality of inkjet printouts used in marking and coding. Yet, it becomes challenging to evaluate when the substrate has been bent prior to testing, like in the case of electrical cables, wires, or optical fibers. This communication presents a solution embodied by a prototype machine specifically designed and built for this purpose and a testing method associated with it. In particular, all the parameters of interest, i.e. the bending speed, angle and radius, and the rubbing speed and applied force can be adjusted over a range representative of the real industrial constraints. The processing of the data allows for a precise quantification of the rub resistance of the ink printed on previously bent substrates.