Welp, I was a derp and took off my nano body armor so i could put on a batpack and mine better with a mining drill...
and then fell into unexpected lava and forgot that with the batpack on that i could take damage from it and did not get the nanochestplate back on in time...
luckily someone was willing to trade for some diamonds so it wasn't quite so bad to get back on my feet, but i lost a full nanosuit, two mining lasers, a diamond drill, chainsaw, and my nano saber >_<
morale of the story: wear all nano all the time.
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There is no shame in not knowing; the shame lies in not finding out