Poor Surface Finish Due to Moisture Absorption

Confirm moisture absorption by observing popping or crackling sounds during extrusion and inspecting the print for surface voids, micro-bubbles, or excessive stringing. Verify the filament's state by checking the humidity levels of the storage environment or by testing a sample segment of the TPU at 55°C for 4–8 hours in a dedicated filament dryer to see if print quality improves after the moisture is removed.