Question: Why is my TPU 3D print stringy and messy?
Answer: Stringy, messy prints with TPU usually result from incorrect retraction settings or printing temperature. TPU is flexible and prone to oozing, so start by reducing your print temperature by 5–10°C to minimise excessive flow—typically, TPU prints well between 210°C and 230°C. Next, adjust retraction settings: increase retraction distance slightly (around 1–3 mm) and speed (20–30 mm/s), but avoid too high values, as TPU can jam. Also, lower your print speed to 20–30 mm/s to give the filament time to extrude smoothly. Ensure your nozzle is clean and use a direct-drive extruder if possible, as Bowden setups struggle with flexible filaments. Finally, check your travel moves to minimise unnecessary nozzle movement over open areas, reducing stringing. Fine-tuning these settings step-by-step will help you get cleaner TPU prints with minimal stringing.
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