The Front Magnet Rotor.
This part will be the front rotor, containing 12 neodymium magnets. The magnets are arranged so that the magnetic poles attract the magnets on the rear rotor. So a north will face a south, then a south will face a north etc... Alternating for each pair of opposing magnets. I haven't taken a photo of the actual part. I forgot, (again). But it looks almost the same as the rear rotor.
This was the original rotor I made. It was designed to hang on the back of the other rotor, and the stator would have been held in place through the hole in the centre. The more I looked at it and thought about it, the more it seemed like a bad idea. Adjusting the air gap between each rotor and the stator would not have been easy, and the weight of the rotor would have all been held on the outer ring of bolts. Balancing the rotor like this would have been almost impossible. That's when the design change came about.