The nefarious voltage error I get sometimes randomly on the MMU2S with the latest firmware sending me to a URL that says to disconnect and reconnect the power and data cable on the MMU after shutting it all off. This is a temporary fix but this error comes up randomly, mostly as soon as I turn on the printer, and infrequently in the middle of a print as it did today. The MMU3 supposedly addresses this known error with a new electronics add on card and new cables. Before upgrading, on the MMU2S I seemed to find a fix by swapping in cables from a spare MMU2S kit. Fast forward a month and I have upgraded it to the MMU3 and this error is definitely fixed this with the new add on board and new cable design to specifically correct this problem!
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