Baking filament to remove the moisture causes problems. It anneals PLA which leads to difficulty getting successful prints, and for the other filaments it causes hydrolysis which degrades your filament. By boiling the water out of your filament with a vacuum chamber you avoid both these problems.

RichRap's video about a low power heated filament box:    • DIY Heated DryBox for 3D Printing fil...  

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