A smart design makes it easy to test, assemble and solder.
The cube has a 3-pin connector and is driven by your Arduino or any board with a free output pin. There are 5 WS2812B LEDs and you can use Neopixel software or the much more compact WS28 lib written in C that runs also on a 8MHz ATtiny.
The trick for the PCB is that the V-grove scoring does not cut the center of the plated through holes situated on the grove. When broken and positioned at 90 degrees, the half-holes are easy to solder. A supplied jig helps for a precise positioning. Position and glue the sides, check, solder - that's done. Add a connector and wires toward your Uno, Nano or other preferred board.
The cube fit inside an empty ball, 20mm outside diameter.
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