How to fix stringy and messy TPU 3D prints

Question: Why is my TPU 3D print stringy and messy?

Answer: Stringiness and messiness in TPU prints usually come from incorrect retraction settings, print temperature, or print speed. First, reduce retraction distance and speed since TPU is flexible and can jam if retracted too aggressively; try lowering retraction to 1-2 mm and slowing the speed to around 20-30 mm/s. Second, check your printing temperature—TPU typically prints best between 210°C and 230°C; printing too hot causes oozing and strings, so try lowering the temperature in 5°C increments. Third, slow down your print speed to around 20-30 mm/s to give the filament time to cool and reduce stringing. Also, enable combing mode if your slicer supports it; this minimises travel moves over open areas, reducing stringing. Finally, ensure your nozzle and filament are dry, as moisture can increase stringiness. Adjust these settings step-by-step, printing test objects to dial in the best results for your specific TPU brand and printer.