I am currently creating a single-shaft grinder/shredder for a 3D printing recycler that can handle models up to 100x67x150mm in size as part of a project at the University of Bath - having a lot of trouble with source the rotor and stator blades for this - can anyone help? I am hoping to find a rotor that is 70mm in diameter and has blades 4mm long, the stator knives will be 5mm.