SyntaxTerror 344
Aaand then I realised I forgot about the second part of your question.
Right. I'm assuming for now that we're talking about some sort of relatively high powered LED here?
The main board has quite a few spare outputs that we can play with - but the thing is that they're unbuffered, direct from the microcontroller. The ATMEGA2560 can only source 40mA on a given output (and that's an absolute maximum rating so you need to stay well clear of it). Which I'm guessing is not enough to power your LED. I'm betting you'll need to buffer the output with a transistor or similar current source. Don't let that scare you though.
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SyntaxTerror 344
Good to hear that you've made progress! And not to worry - we're patient people. Just curious ones as well
For comparison purposes - which firmware version is your UM2 running?
Edit: I can confirm that at least with Tinker firmware, the LEDs do not turn on when set to "always off" in preferences and then starting a print. Just tried it on my own machine.
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