Amphiphilic block bottlebrush copolymers are a class of soft materials that self-assemble into highly tunable nanostructures, offering great potential for applications in biomedicine, sensing, and flexible electronics. Their hierarchical architecture, comprising a grafted backbone with side chains, enables the formation of complex morphologies with properties that are significantly different from those of linear polymers. In this work, the self-assembly of amphiphilic triblock bottlebrush copolymers has been investigated using coarse-grained molecular simulations based on dissipative particle dynamics (DPD). This work focuses on nanoparticle formation induced by rapid solvent exchange mimicking nonequilibrium conditions common in experimental techniques.