Magnet separator
thingiverse
I have quite a selection of neodymium magnets, and sometimes these can get stuck together in a major way. On the larger ones, they can be extremely tough to separate. This has worked for me every time so far. First, support the magnets on something firm (I used plasticine and the floor) to keep your fingers safe from getting hurt. Then, push the tool down between them firmly but carefully. They'll spread apart but still stick to the sides. You can then slowly slide one off at a time by sliding them up and pulling them away. Be extremely careful not to hurt yourself when doing this. It's completely up to you how much risk you want to take on this. This tool will work for magnets that are about 25mm apart, but it should be easy enough to scale up if needed.
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