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[APTechnologies]

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[RJSV]

Hi, Nice to see that, but need a couple days before have much time.
  First helpful thought goes to the LED power consumption, if always ON it matters more: Wanted to mention the 'white emitting' LEDs salvaged from  a Christmas snow related twinkle lights or icecycles (sic) and measured current was exceptionally low!
  Something approximately 30 uA. Voltage of system is not directly relevant.  Many LEDs tend to operate higher, say approaching one mA, or greater. That's 30 times less, but might be hard to get all RGB where you'd like.
  How about use the most efficient (color) and just have an RGB set-up for a background disk. Plus, adaptive or set-able brightness, for better looks, softer or brighter, as you please... More comments later, thanks

[OM222O]

One major improvement I can think of:

The screws look ugly, you can avoid them by moving the lip which the PCB sitst on, to the top side rather than the bottom side. if you're worried about touching it which rotates it around, the simply add a bit of glue to the lip (very small amount!) and put the PCB in place, let the glue dry and bam. resin epoxy usually works well for this application (not the UV curable ones!).

You can also add a second lip above the PCB which will house a glass for a more professional look. I'm not sure about standard sizes of watch glass, but I'm sure you can easily google it.



I spent 2 minutes in CAD (cardboard aided design ) to make a cross section of what I mean. the black part is the main housing with the 2 lips, blue is the glass which sits on top of the upper lip, green is the PCB which sits on the bottom lip and the grey part is the backing which is usually screwed in place but I'm not sure how well 3D printed threads work, you can experiment with different things.

[Renate]

I would have preferred the LEDs in a strict 4x4 (without the gap).
If you have to have screws, rotate them 45 degrees so they visually have more clearance.
I would have hours on top, 8 on the left, 1 on the right.
Single color would be fine for many and make a smaller watch possible.

But this is besides the point, I'd never wear a watch.
I did build a 4x4 clock 40 years ago.