They’ve each got room for 16 addressable WS2812 LEDs in 5 mm packages, with every possible ... a vertical PCB connects to each LED board to provide mechanical support and distribute signals ...

Of course, an LED is a big large for a PCB trace, so he creates a 0.3 mm aperture by printing a mold and using it to cast epoxy to make the part that contacts the PCB film. The fan control turns ...