Drying 1 perlite dust in the Dryer gets you 9 obsidian dust, compared to 9x perlite dust → 9x obsidian dust in the centrifuge.
And it costs less energy to boot 
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Drying 1 perlite dust in the Dryer gets you 9 obsidian dust, compared to 9x perlite dust → 9x obsidian dust in the centrifuge.
And it costs less energy to boot