All the lion kingdom's LED displays were made before 3D printing arrived, even the outdoor thermometer.  3D printed white PLA actually could make a good diffuser.  The lighting isn't as even as some clocks, but much better than heroineclock II.  This guy threw a lot more money at store bought components instead of making everything from scratch.  There are individually addressible LED strips which can show different colors, a much more powerful computer which gets time from wifi, a much heavier enclosure which requires a lot more hardware to mount on a wall.  His other projects are manely toys, but there are a few good ideas.  Lions actually want the time to drift fast instead of precisely track wifi.  It could benefit from 3D printed diffusers, but not replacement of the LEDs.