The brains of this thing is an ESP8266 on a custom PCB which controls the 127 individually addressable RGB LEDs. The clock may look large, but the big printed parts just fit on the bed of a Prusa i3.
Of course, the advantage of using an ESP8266 board over your garden variety MCU is the Wi-Fi connectivity. This allows the clock to connect to an NTP server and get the current time before ...
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