I don't knowPlasmodium wrote: ↑So, what's the idea with the LED?
It really depends on the case and plate design but I think a few RGB or RGBW LEDs will be pretty flexible.
My plan is to have a little hole or slit in the mount plate to show the current layer/status.
Didn't think about HOW exactly I'll represent that using different colors.
As a side note: I designed a little PCB last night for a different project and it will give me an opportunity to play around with that kind of LED.
Trial and error is the most fun after all and I ordered 10 PCBs (who wouldn't at $17 shipped)