Boxer cutter key ring
thingiverse
Very simple design allows you to break packing tape. I designed this one day after I could not get in my house because I bent my keys opening eBay packages. I work in a workplace that we are not allowed to use knives, so this sort of thing is very helpful. Also good if you fly a lot. Good printed in PLA, Nylon or Polycarbonate as it will be stiff enough to break the tape.
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