Magnetic Key ring and belt clip
thingiverse
I found this key ring extremely useful for an extended period of time, but I needed to free my pockets. So I designed one specifically for my work keys and added a magnetic belt clip to it. One side is perfectly sized for regular door keys, while the other fits cabinets keys snugly. A rectangular recess is cleverly designed to hold a small ID and makes checking the orientation easy when clipping it in. Although it looks a bit chunky, it remains compact enough not to be obstructive even when I'm sitting. It also produces a pleasant schlack! sound when the magnets align. This key ring relies on 4 strong neodymium magnets measuring 8x3 mm and 3 screws and nuts (although I couldn't provide the exact sizes, they were leftover printer parts).
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