Improving FDM Filament Drying With A Spot Of Vacuum

Vacuum drying can improve FDM filament moisture removal by lowering the boiling point of water through reduced atmospheric pressure. The author explores the physics of vapor pressure, then runs experiments using a rotary vane pump and diaphragm pumps with a vacuum chamber, testing on silica desiccant and fruit. Results show that vacuum alone (10–100 mbar) removes some moisture but is insufficient without added heat. The conclusion is that combining vacuum with thermal energy is likely the most effective approach, with future experiments planned to test heated vacuum chambers for filament drying.