I am by no means a particularly neat sort guy as my wife can testify. But, I always empty it no later than the end of the day.
I can think of lots of reasons to empty it, many of you have mentioned some of them. I would add one, when you step away from the bench there is no guarantee when you will back, or if. Someone may be cleaning up after you.
I have been unable to come up with a single reason to leave powder in the hopper.
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Ipsis Rebus Dictantitbus
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