This is the small bush bearing casing for the 700 series roomba. If your roomba bearing's casing is deformed from friction generated heat, you can print a new one, and migrate the metal bush from the old casing into this new one.print this at 0.1 to maintain accuracy of the inner most ring, which should measure around 7.25mm diameter. Remove the old bush bearing from the broken part, and push it into the new bearing. oil the bearing with some general machine oil.