We make the cube in 4 layers of 4x4 leds, then solder them together.
Create a layer:
- Put in the LEDs along the back and along one side, and solder them together
- Insert another row of LEDs and solder them together. Do one row at a time to leave place for the soldering iron!
- Repeat the above step 2 more times.
- add cross bracing in the front where the led rows are not connected.
- Repeat 4 times.