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> My favorite one was the K-Cup machine.

At work we had a KCup machine but when I brought in some K cups I bought they wouldn't work. It was a branded K cup but not for the newer machine. I figured out i could take the foil lid of an approved K cup and stick it on the unauthorized K cup.

The "template" foil was left by the machine on a paperclip for anyone to use.



Yeah, eventually someone made a 3d printable item that could bypass it, but it sucked.




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