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Changes in applied force (log scale) produced with %RH levels (20–80%) for 10–60 mm filament lengths (0.12 mm and 0.08 mm nominal filament diameters). Note: impact of altering humidity levels on applied force appears more significant for the thicker 0.12 mm (solid lines) than thinner 0.08 mm (dashed lines) filament. Error bars represent one standard deviation
