Mechanical keyboards must have switches mounted to something, whether that's a PCB, metal plate, or plastic plate. Metal plate mounting is generally found in more expensive keyboards and provides a heavier and sturdier keyboard. PCB mounted switches are found in cheap keyboards and will have more flex and give to them, but they are lighter and cheaper. Plastic plate mounting provides a middle ground between PCB and metal plate mounting, but it’s not commonly used.
Plastic plate mounting also has the unique advantage such as being able to better disperse backlighting compared to metal and PCB, depending on the plastic.
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