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[–] Pawn ago 

vacum + sharpener.

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[–] Fibbideh ago 

I think you're underestimating how messy shit gets in space.

In order to use this vacuum-sharpener you need to send it up there, which uses valuable storage space and weight. On top of this, no machine is perfect. It will miss some shavings. Even the every act of using pencils creates graphite dust. It's how they work. This means prolonged use is a hazard by graphite dust buildup, regardless of how many vacuumes you want to put up there.

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[–] Pawn ago 

You're underestimating and thinking there aren't vacums already up there. Pretty good ones too.