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The magnets inside the rotor are meant to stick to the two larger bearings on the eccentric shaft. They don't need to be in contact with the bearing. The slight magnetic force just keeps the rotor from wondering out of the housing when it's open. As for the visual coolant blocks, I like to print them with the first layer really smooshed so that the "elephant foot" of the first layer allows you to just press them in with out glue.