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So i'm working on the Max V2 hotend, power is switch off, and I moved the cheapskates so that they are inverted. I noticed the LCD will flicker blue like power is being briefly applied to the Rambo. This was unexpected.

Is it supposed to do this? Could I have wired something wrong? I can imagine that the stepper is acting like a generator, feeding current back into the powered-off Rambo, but could this damage the board? I can't imagine it's good for it. Perhaps I just need to move the cheapskates very slowly so not to generate as much current. Or do I need to unplug the steppers from the board before moving the cheapskates?

Just had to ask - very strange indeed!

Cheers,

That's exactly what is happening. The motors act as generators when external force is applied. So long as you don't force the cheapskates to move rapidly, you should be ok.

Yeah, try not to do that if you can help it. That would toast another printer (the ATX power supply has a resistance even when it's off, so it helps dissipate that charge instead of cooking board components).

I've never seen a damaged controller from this personally, but warning abound.