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.
The ESP8266 WiFi module is a slight deviation from ... of open source toolchains for the ESP. [4ndreas] found an RGB LED strip on Ali Express that could be controlled by WiFi.
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