How to fix stringy and messy TPU 3D prints

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

Answer: Stringy, messy prints with TPU usually come from incorrect retraction settings and print temperature. TPU is flexible and tends to ooze more than rigid filaments. Start by lowering your nozzle temperature by 5-10°C; TPU typically prints well between 210-230°C, but every brand varies. Next, adjust retraction: reduce retraction distance to around 1-2mm and slow down retraction speed to about 20-30 mm/s to prevent filament grinding. Also, increase travel speed between moves to minimise oozing. Make sure your print speed is moderate, around 20-30 mm/s, as TPU prints better slower. Finally, check your filament is dry, as moisture can cause stringing. Running a few test prints with these tweaks should reduce stringing and improve surface quality.