When small particles get stuck in those switches - specifically in the hinges at the top and bottom of each switch - keys stop working. While the architecture of the switch appears to be the same, the company has reportedly switched a material in the switches, for greater reliability - to stop keys from getting stuck or emitting unintended double clicks. In May 2019, Apple rolled out new MacBook Pros, which feature a change to the Butterfly key switches. Apple itself didn't promote this change at the product's unveiling, though it did mention this generation of key was supposed to be quieter. In 2018, an iFixit teardown report showed that Apple had introduced a thin, rubbery membrane layer in the keyboard, ostensibly to keep dust out. MORE: Apple Patents Glass MacBook Keyboard That Bends Under Your. Unfortunately, this super-slimmed down design is still large enough for small particles to get lodged in the hinges of said 'wings,' (as seen in this video) and sometimes that detritus dislodges when you apply force. Apple continued to use these switches in all of the MacBook Pro and MacBook Air laptops released since 2015, iterating them slightly for increased stability or less noise.
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