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One thing I would add to the design would be a very thin layer of rubber to the face of the electromagnet, that way it would slip less on metal surfaces if the magnet is running out of power (although that could be a kind of safety feature, if you run out of power you start slipping down the building instead of just falling off)
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Or you can put some sodium hydroxide in there! Not only will it clean your bottle, it will also burn your hand when you pour it out!
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